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Permeability estimation for deformable porous media with convolutional neural network Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-04-16 Kunpeng Shi, Guodong Jin, Weichao Yan, Huilin Xing
Purpose Accurately evaluating fluid flow behaviors and determining permeability for deforming porous media is time-consuming and remains challenging. This paper aims to propose a novel machine-learning method for the rapid estimation of permeability of porous media at different deformation stages constrained by hydro-mechanical coupling analysis. Design/methodology/approach A convolutional neural network
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Irreversibility analysis of Darcy-Forchheimer flow of a Williamson hybrid nanofluids near a stagnation-point across a vertical plate with buoyancy force Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-04-16 Latifah Falah Alharbi, Umair Khan, Aurang Zaib, Anuar Ishak
Purpose A novel type of heat transfer fluid known as hybrid nanofluids is used to improve the efficiency of heat exchangers. It is observed from literature evidence that hybrid nanofluids outperform single nanofluids in terms of thermal performance. This study aims to address the stagnation point flow induced by Williamson hybrid nanofluids across a vertical plate. This fluid is drenched under the
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Constraint-based analysis of heat transport and irreversibility in magnetic nanofluidic thermal systems Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-04-03 Nirmal K. Manna, Abhinav Saha, Nirmalendu Biswas, Koushik Ghosh
Purpose This paper aims to investigate the thermal performance of equivalent square and circular thermal systems and compare the heat transport and irreversibility of magnetohydrodynamic (MHD) nanofluid flow within these systems. Design/methodology/approach The research uses a constraint-based approach to analyze the impact of geometric shapes on heat transfer and irreversibility. Two equivalent systems
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Thermal-hydraulic performance of turbulent flows across a heated round tube installed through several perforated twisted tapes Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-04-03 Shiang-Wuu Perng, Horng Wen Wu, De-An Huang
Purpose The purpose of this study is to advance turbulent thermal convection inside the constant heat-flux round tube inserted by multiple perforated twisted tapes. Design/methodology/approach The novel design of this study is accomplished by inserting several twisted tapes and drilling some circular perforations near the tape edge (C1, C3, C5: solid tapes; C2, C4, C6: perforated tapes). The turbulence
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Extended (3 + 1)-dimensional Kairat-II and Kairat-X equations: Painlevé integrability, multiple soliton solutions, lump solutions, and breather wave solutions Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-04-09 Abdul-Majid Wazwaz
Purpose This study aims to investigate two newly developed (3 + 1)-dimensional Kairat-II and Kairat-X equations that illustrate relations with the differential geometry of curves and equivalence aspects. Design/methodology/approach The Painlevé analysis confirms the complete integrability of both Kairat-II and Kairat-X equations. Findings This study explores multiple soliton solutions for the two examined
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Solid–liquid phase transition simulated by the lattice Boltzmann model: from pore scale to representative elementary volume scale Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-04-04 Dong Li, Yu Zhou, Zhan-Wei Cao, Xin Chen, Jia-Peng Dai
Purpose This paper aims to establish a lattice Boltzmann (LB) method for solid-liquid phase transition (SLPT) from the pore scale to the representative elementary volume (REV) scale. By applying this method, detailed information about heat transfer and phase change processes within the pores can be obtained, while also enabling the calculation of larger-scale SLPT problems, such as shell-and-tube phase
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Linear stability analysis of MHD mixed convection flow of a radiating nanofluid in porous channel in presence of viscous dissipation Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-04-05 Cédric Gervais Njingang Ketchate, Oluwole Daniel Makinde, Pascalin Tiam Kapen, Didier Fokwa
Purpose This paper aims to investigate the hydrodynamic instability properties of a mixed convection flow of nanofluid in a porous channel. Design/methodology/approach The treated single-phase nanofluid is a suspension consisting of water as the working fluid and alumina as a nanoparticle. The anisotropy of the porous medium and the effects of the inclination of the magnetic field are highlighted.
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Numerical investigation on thermal protection of wind turbine flanges in extremely cold weather Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-04-02 Chenyu Zhang, Hongtao Xu, Yaodong Da
Purpose Thermal protection of a flange is critical for preventing tower icing and collapse of wind turbines (WTs) in extremely cold weather. This study aims to develop a novel thermal protection system for the WTs flanges using an electrical heat-tracing element. Design/methodology/approach A three-dimensional model and the Poly-Hexacore mesh structure are used, and the fluid-solid coupling method
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Deep learning algorithms for temperature prediction in two-phase immersion-cooled data centres Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-29 Pratheek Suresh, Balaji Chakravarthy
Purpose As data centres grow in size and complexity, traditional air-cooling methods are becoming less effective and more expensive. Immersion cooling, where servers are submerged in a dielectric fluid, has emerged as a promising alternative. Ensuring reliable operations in data centre applications requires the development of an effective control framework for immersion cooling systems, which necessitates
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An impact of ternary nanofluid on a micropolar fluid with inclined MHD, slip flow and heat transfer Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-26 U.S. Mahabaleshwar, Mahesh Rudraiah, Huang Huang, Bengt Ake Sunden
Purpose The purpose of this study is to analyze the impact of inclined magnetohydrodynamics (MHD) and thermal radiation on the flow of a ternary micropolar nanofluid on a sheet that is expanding and contracting while applying mass transpiration and velocity slip conditions to the flow. The nanofluid, which is composed of Au, Ag and Cu nanoparticles dispersed in water as the base fluid, possesses critical
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Investigation of magneto-convection characteristics in a sudden expanding channel with convex surface geometry under thermally developing flow conditions Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-25 Emrehan Gürsoy, Hayati Kadir Pazarlioğlu, Mehmet Gürdal, Engin Gedik, Kamil Arslan, Abdullah Dağdeviren
Purpose The purpose of this study is to analyse the magnetic field effect on Fe3O4/H2O Ferrofluid flowing in a sudden expansion tube, which has specific behaviour in terms of rheology, with convex dimple fins. Because the investigation of flow separation is a prominent application in performance, the effect of magnetic field and convex dimple on the thermo-hydraulic performance of sudden expansion
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Effect of hot air inclined jet impingement to container for controlling of energy storage of PCM: experimental and numerical investigation Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-20 Hakan F. Oztop, Burak Kiyak, Ishak Gökhan Aksoy
Purpose This study aims to focus on understanding how different jet angles and Reynolds numbers influence the phase change materials’ (PCMs) melting process and their capacity to store energy. This approach is intended to offer novel insights into enhancing thermal energy storage systems, particularly for applications where heat transfer efficiency and energy storage are critical. Design/methodology/approach
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Swirl-induced motion prediction with physics-guided machine learning utilizing spatiotemporal flow field structure Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-20 Ziming Zhou, Fengnian Zhao, David Hung
Purpose Higher energy conversion efficiency of internal combustion engine can be achieved with optimal control of unsteady in-cylinder flow fields inside a direct-injection (DI) engine. However, it remains a daunting task to predict the nonlinear and transient in-cylinder flow motion because they are highly complex which change both in space and time. Recently, machine learning methods have demonstrated
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Heat transfer analysis of magnetohydrodynamics peristaltic fluid with inhomogeneous solid particles and variable thermal conductivity through curved passageway Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-12 Atifa Kanwal, Ambreen A. Khan, Sadiq M. Sait, R. Ellahi
Purpose The particle distribution in a fluid is mostly not homogeneous. The inhomogeneous dispersion of solid particles affects the velocity profile as well as the heat transfer of fluid. This study aims to highlight the effects of varying density of particles in a fluid. The fluid flows through a wavy curved passage under an applied magnetic field. Heat transfer is discussed with variable thermal
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Impact of memory-dependent heat transfer on Rayleigh waves propagation in nonlocal piezo-thermo-elastic medium with voids Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-11 Vipin Gupta, Barak M.S., Soumik Das
Purpose This paper addresses a significant research gap in the study of Rayleigh surface wave propagation within a piezoelectric medium characterized by piezoelectric properties, thermal effects and voids. Previous research has often overlooked the crucial aspects related to voids. This study aims to provide analytical solutions for Rayleigh waves propagating through a medium consisting of a nonlocal
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Simulation of phase change during the freezing of unsaturated porous media by using a coupled lattice Boltzmann model Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-07 Fei Xu, Zheng Wang, Wei Hu, Caihao Yang, Xiaolong Li, Yaning Zhang, Bingxi Li, Gongnan Xie
Purpose The purpose of this paper is to develop a coupled lattice Boltzmann model for the simulation of the freezing process in unsaturated porous media. Design/methodology/approach In the developed model, the porous structure with complexity and disorder was generated by using a stochastic growth method, and then the Shan-Chen multiphase model and enthalpy-based phase change model were coupled by
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Adjoined ISPH method and artificial intelligence for thermal radiation on double diffusion inside a porous L-shaped cavity with fins Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-03-04 Hillal M. Elshehabey, Andaç Batur Çolak, Abdelraheem Aly
Purpose The purpose of this study is to adapt the incompressible smoothed particle hydrodynamics (ISPH) method with artificial intelligence to manage the physical problem of double diffusion inside a porous L-shaped cavity including two fins. Design/methodology/approach The ISPH method solves the nondimensional governing equations of a physical model. The ISPH simulations are attained at different
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Numerical investigation of three-dimensional natural convection heat transfer on corrugated plates of variable height Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-28 Sílvio Aparecido Verdério Júnior, Pedro J. Coelho, Vicente Luiz Scalon
Purpose The purpose of this study is to numerically investigate the geometric influence of different corrugation profiles (rectangular, trapezoidal and triangular) of varying heights on the flow and the natural convection heat transfer process over isothermal plates. Design/methodology/approach This work is an extension and finalization of previous studies of the leading author. The numerical methodology
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Research on precise and standardized numerical simulation strategy for vehicle aerodynamics Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-29 Zhen Chen, Jing Liu, Chao Ma, Huawei Wu, Zhi Li
Purpose The purpose of this study is to propose a precise and standardized strategy for numerically simulating vehicle aerodynamics. Design/methodology/approach Error sources in computational fluid dynamics were analyzed. Additionally, controllable experiential and discretization errors, which significantly influence the calculated results, are expounded upon. Considering the airflow mechanism around
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Thermal performance improvement in wavy microchannels using secondary channels Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-27 Karthikeyan Paramanandam, Venkatachalapathy S, Balamurugan Srinivasan, Nanda Kishore P V R
Purpose This study aims to minimize the pressure drop across wavy microchannels using secondary branches without compromising its capacity to transfer the heat. The impact of secondary flows on the pressure drop and heat transfer capabilities at different Reynolds numbers are investigated numerically for different wavy microchannels. Finally, different channels are evaluated using performance evaluation
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Aerodynamic performance increase over an A320 morphing wing in transonic regime by numerical simulation at high Reynolds number Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-27 Jacques Abou Khalil, César Jiménez Navarro, Rami El Jeaid, Abderahmane Marouf, Rajaa El Akoury, Yannick Hoarau, Jean-François Rouchon, Marianna Braza
Purpose This study aims to investigate the morphing concepts able to manipulate the dynamics of the downstream unsteadiness in the separated shear layers and, in the wake, be able to modify the upstream shock–boundary layer interaction (SBLI) around an A320 morphing prototype to control these instabilities, with emphasis to the attenuation or even suppression of the transonic buffet. The modification
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Analysis of open channel flow with various layered vegetation using CFD, considering different near-wall treatment methods Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-20 Rahim Şibil
Purpose The purpose of this paper is to investigate the impact of near-wall treatment approaches, which are crucial parameters in predicting the flow characteristics of open channels, and the influence of different vegetation covers in different layers. Design/methodology/approach Ansys Fluent, a computational fluid dynamics software, was used to calculate the flow and turbulence characteristics using
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Comparative analysis of entropy generation and heat transfer in a tilted partially heated square enclosure using the finite difference method Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-20 Ebrahem A. Algehyne
Purpose In recent times, there has been a growing interest in buoyancy-induced heat transfer within confined enclosures due to its frequent occurrence in heat transfer processes across diverse engineering disciplines, including electronic cooling, solar technologies, nuclear reactor systems, heat exchangers and energy storage systems. Moreover, the reduction of entropy generation holds significant
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A new exploration on passive control of transonic flow over a backward-facing step Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-19 Xiang Shen, Kai Zeng, Liming Yang, Chengyong Zhu, Laurent Dala
Purpose This paper aims to study passive control techniques for transonic flow over a backward-facing step (BFS) using square-lobed trailing edges. The study investigates the efficacy of upward and downward lobe patterns, different lobe widths and deflection angles on flow separation, aiming for a deeper understanding of the flow physics behind the passive flow control system. Design/methodology/approach
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Entropy generation in a partially heated hybrid nanofluid saturated wavy porous cavity Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-05 Prabir Barman, Srinivasa Rao Pentyala, B.V. Rathish Kumar
Purpose A porous cavity flow field generates entropy owing to energy and momentum exchange within the fluid and at solid barriers. The heat transport and viscosity effects on fluid and solid walls irreversibly generate entropy. This numerical study aims to investigate convective heat transfer together with entropy generation in a partially heated wavy porous cavity filled with a hybrid nanofluid.
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Numerical modelling and experimental validation of dripping, jetting and whipping modes of gas dynamic virtual nozzle Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-05 Krištof Kovačič, Jurij Gregorc, Božidar Šarler
Purpose This study aims to develop an experimentally validated three-dimensional numerical model for predicting different flow patterns produced with a gas dynamic virtual nozzle (GDVN). Design/methodology/approach The physical model is posed in the mixture formulation and copes with the unsteady, incompressible, isothermal, Newtonian, low turbulent two-phase flow. The computational fluid dynamics
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Entropy generation for thermo-magnetic fractional order convective flow in complex porous enclosures: a numerical study Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-02-02 Deepika Parmar, S.V.S.S.N.V.G. Krishna Murthy, B.V. Rathish Kumar, Sumant Kumar
Purpose This study aims to analyze the impact of fractional derivatives on heat transfer and entropy generation during transient free convection inside various complex porous enclosures, such as triangle, L-shape and square-containing wavy surfaces. These porous enclosures are saturated with Cu-water nanofluid and subjected to the influence of a uniform magnetic field. Design/methodology/approach In
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A Hamiltonian equation produces a variety of Painlevé integrable equations: solutions of distinct physical structures Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-30 Abdul-Majid Wazwaz
Purpose The purpose of this paper is to investigate a variety of Painlevé integrable equations derived from a Hamiltonian equation. Design/methodology/approach The newly developed Painlevé integrable equations have been handled by using Hirota’s direct method. The authors obtain multiple soliton solutions and other kinds of solutions for these six models. Findings The developed Hamiltonian models exhibit
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Scaling and modeling of the heat transfer across the free surface of a thermocapillary liquid bridge Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-29 Francesco Romanò, Mario Stojanović, Hendrik C. Kuhlmann
Purpose This paper aims to derive a reduced-order model for the heat transfer across the interface between a millimetric thermocapillary liquid bridge from silicone oil and the surrounding ambient gas. Design/methodology/approach Numerical solutions for the two-fluid model are computed covering a wide parametric space, making a total of 2,800 numerical flow simulations. Based on the computed data,
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Effects of velocity, thermal and concentration slips on the entropy generation of nanofluid over an inclined sheet Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-29 Ashok K. Barik, Swetapadma Rout, Jnana Ranjan Senapati, M.M. Awad
Purpose This paper aims at studying numerically the entropy generation of nanofluid flowing over an inclined sheet in the presence of external magnetic field, heat source/sink, chemical reaction along with slip boundary conditions imposed on an impermeable wall. Design/methodology/approach A suitable similarity transformation technique has been used to convert the coupled nonlinear partial differential
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Aerodynamic force by Lamb vector integrals in unsteady compressible flows Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-25 Mauro Minervino, Renato Tognaccini
Purpose This study aims to propose an aerodynamic force decomposition which, for the first time, allows for thrust/drag bookkeeping in two-dimensional viscous and unsteady flows. Lamb vector-based far-field methods are used at the scope, and the paper starts with extending recent steady compressible formulas to the unsteady regime. Design/methodology/approach Exact vortical force formulas are derived
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Effects of heater positions on magneto-hydrodynamic convection of CuO-water nanofluid flow in a grooved channel Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-23 Md Motiur Rahaman, Nirmalendu Biswas, Apurba Kumar Santra, Nirmal K. Manna
Purpose This study aims to delve into the coupled mixed convective heat transport process within a grooved channel cavity using CuO-water nanofluid and an inclined magnetic field. The cavity undergoes isothermal heating from the bottom, with variations in the positions of heated walls across the grooved channel. The aim is to assess the impact of heater positions on thermal performance and identify
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Multi-segmental heating of facing vertical walls in porous systems filled with hybrid nanofluid in a constant-strength magnetic environment Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-19 Sobhan Pandit, Milan K. Mondal, Dipankar Sanyal, Nirmal K. Manna, Nirmalendu Biswas, Dipak Kumar Mandal
Purpose This study aims to undertake a comprehensive examination of heat transfer by convection in porous systems with top and bottom walls insulated and differently heated vertical walls under a magnetic field. For a specific nanofluid, the study aims to bring out the effects of different segmental heating arrangements. Design/methodology/approach An existing in-house code based on the finite volume
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Numerical analysis of the SIS infectious disease model with spatial heterogeneity Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-18 Yarong Zhang, Meng Hu
Purpose The susceptible-infectious-susceptible (SIS) infectious disease models without spatial heterogeneity have limited applications, and the numerical simulation without considering models’ global existence and uniqueness of classical solutions might converge to an impractical solution. This paper aims to develop a robust and reliable numerical approach to the SIS epidemic model with spatial heterogeneity
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Magneto-nanofluidic thermal transport and irreversibility in semicircular systems with heated wavy bottom under constant fluid volume and cooling surface constraints Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-15 Nirmalendu Biswas, Deep Chatterjee, Sandip Sarkar, Nirmal K. Manna
Purpose This study aims to investigate the influence of wall curvature in a semicircular thermal annular system on magneto-nanofluidic flow, heat transfer and entropy generation. The analysis is conducted under constant cooling surface and fluid volume constraints. Design/methodology/approach The mathematical equations describing the thermo-fluid flow in the semicircular system are solved using the
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Precision and efficiency of an interpolation approach to weakly singular integral equations Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-12 Imtiyaz Ahmad Bhat, Lakshmi Narayan Mishra, Vishnu Narayan Mishra, Cemil Tunç, Osman Tunç
Purpose This study aims to discuss the numerical solutions of weakly singular Volterra and Fredholm integral equations, which are used to model the problems like heat conduction in engineering and the electrostatic potential theory, using the modified Lagrange polynomial interpolation technique combined with the biconjugate gradient stabilized method (BiCGSTAB). The framework for the existence of the
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A numerical study on the effects of inclination angle and container material on thermal energy storage by phase change material in a thick-walled disc Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-11 Burak Kiyak, Hakan Fehmi Oztop, Ishak Gökhan Aksoy
Purpose The purpose of this study is to examine the effects of inclination angle on the thermal energy storage capability of a phase change material (PCM) within a disc-shaped container. Different container materials are also tested such as plexiglass and aluminium. This study aims to assess the energy storage capacity, melting behaviour and temperature distributions of PCM with a specific melting
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Entropy generation analysis of a ternary hybrid nanofluid (Au-CuO-GO/blood) containing gyrotactic microorganisms in bifurcated artery Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-09 Bhupendra Kumar Sharma, Umesh Khanduri, Rishu Gandhi, Taseer Muhammad
Purpose The purpose of this paper is to study haemodynamic flow characteristics and entropy analysis in a bifurcated artery system subjected to stenosis, magnetohydrodynamic (MHD) flow and aneurysm conditions. The findings of this study offer significant insights into the intricate interplay encompassing electro-osmosis, MHD flow, microorganisms, Joule heating and the ternary hybrid nanofluid. Des
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Magnetotactic bacteria and Fe3O4–water in a wavy walled cavity Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-09 Bengisen Pekmen Geridonmez, Hakan Oztop
Purpose The purpose of this study is to investigate the interaction between magnetotactic bacteria and Fe3O4–water nanofluid (NF) in a wavy enclosure in the presence of 2D natural convection flow. Design/methodology/approach Uniform magnetic field (MF), Brownian and thermophoresis effects are also contemplated. The dimensionless, time-dependent equations are governed by stream function, vorticity,
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Numerical simulation of entropy generation in thermo-magnetic convection in an inverted T-shaped porous enclosure under thermal radiation Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-09 Sumant Kumar, B.V. Rathish Kumar, S.V.S.S.N.V.G. Krishna Murthy, Deepika Parmar
Purpose Thermo-magnetic convective flow analysis under the impact of thermal radiation for heat and entropy generation phenomena is an active research field for understanding the efficiency of thermodynamic systems in various engineering sectors. This study aims to examine the characteristics of convective heat transport and entropy generation within an inverted T-shaped porous enclosure saturated
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Conductive panel cooling by using coupled effects of nano-jet impingement, double rotating cylinders and magnetic field under cross-flow Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-09 Fatih Selimefendigil, Hakan F. Oztop
Purpose This study aims to examine the effects of cross-flow and multiple jet impingement on conductive panel cooling performance when subjected to uniform magnetic field effects. The cooling system has double rotating cylinders. Design/methodology/approach Cross-flow ratios (CFR) ranging from 0.1 to 1, magnetic field strength (Ha) ranging from 0 to 50 and cylinder rotation speed (Rew) ranging from
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Statistical analysis of radiative solar trough collectors for MHD Jeffrey hybrid nanofluid flow with gyrotactic microorganism: entropy generation optimization Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-08 Anup Kumar, Bhupendra Kumar Sharma, Bandar Bin-Mohsen, Unai Fernandez-Gamiz
Purpose A parabolic trough solar collector is an advanced concentrated solar power technology that significantly captures radiant energy. Solar power will help different sectors reach their energy needs in areas where traditional fuels are in use. This study aims to examine the sensitivity analysis for optimizing the heat transfer and entropy generation in the Jeffrey magnetohydrodynamic hybrid nanofluid
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Effect of typical arch structure on slipstream and wake flow of 600 km/h maglev train Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-08 Tong-Tong Lin, Ming-Zhi Yang, Lei Zhang, Tian-Tian Wang, Yu Tao, Sha Zhong
Purpose The aerodynamic differences between the head car (HC) and tail car (TC) of a high-speed maglev train are significant, resulting in control difficulties and safety challenges in operation. The arch structure has a significant effect on the improvement of the aerodynamic lift of the HC and TC of the maglev train. Therefore, this study aims to investigate the effect of a streamlined arch structure
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Hybrid-nanofluid magneto-convective flow and porous media contribution to entropy generation Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2024-01-05 Fateh Mebarek-Oudina, Ines Chabani, Hanumesh Vaidya, Abdul Aziz I. Ismail
Purpose This paper aims to present a numerical study that investigates the flow of MgO-Al2O3/water hybrid nanofluid inside a porous elliptical-shaped cavity, in which we aim to examine the performance of this thermal system when exposed to a magnetic field via heat transfer features and entropy generation. Design/methodology/approach The configuration consists of the hybrid nanofluid out layered by
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Investigation of an improved cold plate design with circuitous minichannel: a computational study involving the effect of conjugate heat transfer Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-29 Jyoti Ranjan Mohapatra, Manoj Kumar Moharana
Purpose This study aims to investigate a new circuitous minichannel cold plate (MCP) design involving flow fragmentation. The overall thermal performance and the temperature uniformity analysis are performed and compared with the traditional serpentine design. The substrate thickness and its thermal conductivity are varied to analyse the effect of axial-back conduction due to the conjugate nature of
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Prediction of multi-physics field distribution on gas turbine endwall using an optimized surrogate model with various deep learning frames Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-28 Weixin Zhang, Zhao Liu, Yu Song, Yixuan Lu, Zhenping Feng
Purpose To improve the speed and accuracy of turbine blade film cooling design process, the most advanced deep learning models were introduced into this study to investigate the most suitable define for prediction work. This paper aims to create a generative surrogate model that can be applied on multi-objective optimization problems. Design/methodology/approach The latest backbone in the field of
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Entropy generation analysis for convective flow of aqua Ag-CuO hybrid nanofluid adjacent to a warmed down-pointing rotating vertical cone Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-26 Hamza Berrehal, Roshanak Karami, Saeed Dinarvand, Ioan Pop, Ali Chamkha
Purpose This paper aims to study numerically the flow, heat transfer, and entropy generation of aqueous copper oxide-silver hybrid nanofluid over a down-pointing rotating vertical cone, with linear surface temperature (LST) and linear surface heat flux (LSHF), in the presence of a cross-magnetic field. In industrial applications, such as oil and gas plants, food industries, steel factories and nuclear
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Thermal conductivity prediction of aerogel considering heat treatment effect and the application to a TPS of long endurance HFVs Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-26 Ting Dai, Chang Tao
Purpose For a thermal protection system (TPS) of long endurance hypersonic flight vehicle (HFV), its thermal insulation property not only determines by the manufactured morphology but also changes along time. A thermal conductivity prediction model for aerogel considering heat treatment effect is carried out and applied to solve the heat conduction problem of a TPS. The aim of this study is to provide
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Convective heat transport and entropy generation in butterfly-shaped magneto-nanofluidic systems with bottom heating and top cooling Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-26 Aniket Halder, Arabdha Bhattacharya, Nirmalendu Biswas, Nirmal K. Manna, Dipak Kumar Mandal
Purpose The purpose of this study is to carry out a comprehensive analysis of magneto-hydrodynamics (MHD), nanofluidic flow dynamics and heat transfer as well as thermodynamic irreversibility, within a novel butterfly-shaped cavity. Gaining a thorough understanding of these phenomena will help to facilitate the design and optimization of thermal systems with complex geometries under magnetic fields
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High-order relaxation methods for nonequilibrium two-phase flow equations Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-25 Fatima Harbate, Nouh Izem, Mohammed Seaid, Dia Zeidan
Purpose The purpose of this paper is to investigate the two-phase flow problems involving gas–liquid mixture. Design/methodology/approach The governed equations consist of a range of conservation laws modeling a classification of two-phase flow phenomena subjected to a velocity nonequilibrium for the gas–liquid mixture. Effects of the relative velocity are accounted for in the present model by a kinetic
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Dual solutions for axisymmetric flow and heat transfer due to a permeable radially shrinking disk in copper oxide (CuO) and silver (Ag) hybrid nanofluids with radiation effect Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-22 Iskandar Waini, Farah Nadzirah Jamrus, Natalia C. Roșca, Alin V. Roșca, Ioan Pop
Purpose This study aims to investigate the dual solutions for axisymmetric flow and heat transfer due to a permeable radially shrinking disk in copper oxide (CuO) and silver (Ag) hybrid nanofluids with radiation effect. Design/methodology/approach The partial differential equations that governed the problem will undergo a transformation into a set of similarity equations. Following this transformation
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Magneto-thermal convection and entropy production of hybrid nanofluid in an inclined chamber having a solid block Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-22 Priyadharsini Sivaraj, Sivaraj Chinnasamy
Purpose This paper aims to examine the thermal transmission and entropy generation of hybrid nanofluid filled containers with solid body inside. The solid body is seen as being both isothermal and capable of producing heat. A time-dependent non-linear partial differential equation is used to represent the transfer of heat through a solid body. The current study’s objective is to investigate the key
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Two-phase flow regime identification using multi-method feature extraction and explainable kernel Fisher discriminant analysis Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-25 Umair Khan, William Pao, Karl Ezra Salgado Pilario, Nabihah Sallih, Muhammad Rehan Khan
Purpose Identifying the flow regime is a prerequisite for accurately modeling two-phase flow. This paper aims to introduce a comprehensive data-driven workflow for flow regime identification. Design/methodology/approach A numerical two-phase flow model was validated against experimental data and was used to generate dynamic pressure signals for three different flow regimes. First, four distinct methods
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Hiemenz stagnation point flow of a second-order micropolar slip flow with heat transfer Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-19 Waqar Khan Usafzai, Emad H. Aly, Ioan Pop
Purpose This paper aims to study a non-Newtonian micropolar fluid flow over a bidirectional flexible surface for multiple exact solutions of momentum boundary layer and thermal transport phenomenon subject to wall mass flux, second-order slip and thermal jump conditions. Design/methodology/approach The coupled equations are transformed into ordinary differential equations using similarity variables
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Developing computational methods of heat flow using bioheat equation enhancing skin thermal modeling efficiency Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-19 Rouhollah Ostadhossein, Siamak Hoseinzadeh
Purpose The main objective of this paper is to investigate the response of human skin to an intense temperature drop at the surface. In addition, this paper aims to evaluate the efficiency of finite difference and finite volume methods in solving the highly nonlinear form of Pennes’ bioheat equation. Design/methodology/approach One-dimensional linear and nonlinear forms of Pennes’ bioheat equation
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Moving wall effect on normal shock wave–turbulent boundary layer interaction on an airfoil Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-20 Oskar Szulc, Piotr Doerffer, Pawel Flaszynski, Marianna Braza
Purpose This paper aims to describe a proposal for an innovative method of normal shock wave–turbulent boundary layer interaction (SBLI) and shock-induced separation control. Design/methodology/approach The concept is based on the introduction of a tangentially moving wall upstream of the shock wave and in the interaction region. The SBLI control mechanism may be implemented as a closed belt floating
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Numerical analysis on the thermal management of phase change material with fins for lithium-ion batteries Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-18 Shian Li, Yuanzhe Cheng, Qiuwan Shen, Chongyang Wang, Chengdong Peng, Guogang Yang
Purpose The purpose of this study is to improve the thermal management of lithium-ion batteries. The phase change material (PCM) cooling does not require additional equipment to consume energy. To improve the heat dissipation capacity of batteries, fins are added in the PCM to enhance the heat transfer process. Design/methodology/approach Computational fluid dynamics method is used to study the influence
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Investigation of the lattice Boltzmann method to resolve combined radiation-conduction heat transfer in participating media with curved boundaries Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-14 Marjan Sharifi, Majid Siavashi, Milad Hosseini
Purpose Present study aims to extend the lattice Boltzmann method (LBM) to simulate radiation in geometries with curved boundaries, as the first step to simulate radiation in complex porous media. In recent years, researchers have increasingly explored the use of porous media to improve the heat transfer processes. The lattice Boltzmann method (LBM) is one of the most effective techniques for simulating
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Numerical simulation of pulsatile blood flow through eccentric double stenosed carotid artery Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-14 Swapnil Narayan Rajmane, Shaligram Tiwari
Purpose This study aims to perform three-dimensional numerical computations for blood flow through a double stenosed carotid artery. Pulsatile flow with Womersley number (Wo) of 4.65 and Reynolds number (Re) of 425, based on the diameter of normal artery and average velocity of inlet pulse, was considered. Design/methodology/approach Finite volume method based ANSYS Fluent 20.1 was used for solving
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Research on aerodynamic characteristics of vehicle platoon under crosswind conditions based on Ahmed body Int. J. Numer. Methods Heat Fluid Flow (IF 4.2) Pub Date : 2023-12-11 Jianbin Luo, Mingsen Li, Ke Mi, Zhida Liang, Xiaofeng Chen, Lei Ye, Yuanhao Tie, Song Xu, Haiguo Zhang, Guiguang Chen, Chunmei Jiang
Purpose The purpose of this paper is to study the aerodynamic characteristics of Ahmed body in longitudinal and lateral platoons under crosswind by computational fluid dynamics simulation. It helps to improve the aerodynamic characteristics of vehicles by providing theoretical basis and engineering direction for the development and progress of intelligent transportation. Design/methodology/approach