样式: 排序: IF: - GO 导出 标记为已读
-
Development of compact-modulated absorption/emission technique towards micro-gravity sooting flame measurements Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-12 Qianlong Wang, Zhen Li, Xiaoqing You, Haifeng Liu, Mingfa Yao, Yi Wu
To meet the experimental physical limitations on Chinese Space Station (CSS), three compact-modulated absorption/emission (CMAE) implementations are miniaturized progressively from original MAE layout, which are investigated as potential options for simultaneous soot temperature and volume fraction measurements in the axis-symmetric flames. Contrasted with the original MAE technique, a white LED point
-
Experimental study on the influence of inlet pressure on the flow parameters at the reverse flow boundary of vortex tube and its relation with energy separation performance Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-12 Chen Guangming, Jiang Guannan, Tang Liming, Li Nian
The performance of the vortex tube (also known as the Ranque-Hilsch tube) is significantly influenced by the inlet pressure and the internal flow processes, which can be categorized into two distinct flows: the center and the outer flow. The reverse flow boundary, acting as the interface between the two flows, plays a crucial role in energy separation. However, the research on the location of the reverse
-
Study of the flow pattern and pressure drop law of the air-water-foam three-phase flow Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-07 Guowei Wang, Ruiquan Liao, Lijuan Huang, Qi Xia, Manlai Zhang, Yu Lei, Wei Wang
-
Experimental studies on simultaneously reducing flow drag and noise of a circular cylinder with a downstream porous material plate Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-06 Chen Xu, Xiaojiang Gu, Yijun Mao, Chao Wang
Pressure drag and noise level are two key parameters related to flow past a bluff body, thus various active and passive methods have been developed to reduce the drag and noise. The paper presents a passive method of simultaneously reducing the pressure drag and aerodynamic noise associated with flow past a smooth circular cylinder by placing a porous material plate (PMP) downstream the cylinder. Multi-points
-
Confinement effect on recirculation structures in isothermal coaxial swirling jet Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-06 R. Santhosh, Arun Pattanshetti, Rajneesh Yadav
The present experimental work reports first observations of effect of confinement on recirculation structures in non-reacting coaxial swirling jet in geometric swirl number range of 2.14–2.88. In particular, particle image velocimetry (PIV) has been employed to study the effect of two confinement ratios () viz. 1.82 and 2.73 on two types of recirculation zones (RZ) i.e., pre-breakdown dual rings ()
-
Refrigeration experiments of gas wave rotor based on calibration-free WMS-TDLAS method Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-04 Yihui Zhou, Yunhao Ren, Feng Gao, Zhijun Liu, Dapeng Hu
-
Reconstruction method considering the electrostatic signal waveform of velocity distribution in flame based on EST Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-04 Chao Wang, Xiaoning Cao, Tao Liu, Shuo Jin, Mingdong Xiao
-
Uncertainty quantification for high-temperature flame sensing using wavelength modulation spectroscopy Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-03 Zongtai Li, Qingyan He, Rémy Mével, Xiaoqing You
In this study, we explore the uncertainty of the wavelength modulation spectroscopy (WMS) technique applied to water profile measurement in a flat flame. The scanned WMS-2f/1f method is used to measure the water profile in a CH-O-Ar flame, using an absorption transition line near 1391.7 nm. The Monte Carlo sampling method is used for the uncertainty quantification (UQ) analysis. The results show a
-
Three-dimensional temperature reconstruction strategy for turbine blades using infrared thermography at simulated-engine conditions Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-04-03 Fei Zeng, Kechen Wang, Zhe Shi, Mengwei Huang, Wenbin Chen, Yihong He, Wenwu Zhou
Infrared thermography is a commonly used non-contact temperature measurement technique for thermal diagnostics of gas turbine blades. However, the infrared camera only provides two-dimensional images, which is not conducive to accurately locating temperature anomalies on the turbine blade surface. To overcome the limitations of two-dimensional infrared images, this paper proposes a three-dimensional
-
Experimental study on generation and growth of bubbles in external flash-boiling spray regime Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-31 Dong-Hyeon Kang, Hyun-Woo Cha, Hyunchang Lee
High-performance liquid propulsion systems, such as hypersonic scramjets and liquid rockets, utilize regenerative cooling by employing fuel as a coolant to shield components from thermal damage. The flash-boiling spray, resulting from superheated liquid injection and prevalent in regenerative cooling, has received considerable research interest for enhancing atomization and combustion efficiency. In
-
Directional vapor mobility from asymmetric microstructured surfaces in an adverse gravity orientation Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-31 Karthekeyan Sridhar, Vinod Narayanan, Sushil H. Bhavnani
Stagnant vapor growth on a downward-facing flat surface leads to increased surface temperature and dryout at relatively low heat fluxes. The current study investigates boiling from a surface with periodic 60°-30° or 75°-15° asymmetric sawtooth microstructures to passively remove vapor slugs in adverse gravity. Bubble dynamics is experimentally investigated in an 8-mm square borosilicate glass tube
-
Bubble size distribution and turbulence characterization in a bubbly flow in the presence of surfactant Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-26 Mohammad Mainul Hoque, Subhasish Mitra, Geoffrey Evans
-
On the behaviour of impinging sweeping jets: effects of the mixing chamber length, the feedback channel minimum cross-sectional area and the nozzle-to-plate distance Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-24 Cristina D’Angelo, Gerardo Paolillo, Carlo Salvatore Greco, Gennaro Cardone, Tommaso Astarita
An experimental investigation on the effects of the mixing chamber length, the feedback channel minimum cross-sectional area and the nozzle-to-plate distance on the external flow field of impinging sweeping jets is performed by employing the Particle Image Velocimetry (PIV) technique. Three sweeping jet devices, characterized by different mixing chamber lengths (, being the width of the exit nozzle
-
Research on fluidic thrust vector technology based on passive secondary flow with dual inclined walls under low subsonic speed Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-24 Yuhang Zhou, Yunsong Gu, Linkai Li, Yi Wang, Nanxing Shi, Zi Huang
The application of fluidic thrust vector technology enables active flow control to deflect the jet. At present, hysteresis and abrupt jump phenomena have been found in the control law of fluidic thrust vector technology based on the Coanda effect. To weaken the abrupt jump and eliminate hysteresis phenomena, a new fluidic thrust vectoring nozzle based on passive secondary flow with dual inclined walls
-
Experimental investigation of the two-phase flow distribution and pressure drop characteristic within the cathode bending type channel of fuel cell Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-24 Yongchao Li, Hui Zhou, Chenyu Li, Zhien Liu, Pei Zhang, Chihua Lu
The accurate prediction of the two-phase flow distribution within the channel is of great significance for enhancing fuel cell water management and improving output efficiency. The current study constructs a novel transparent fuel cell visualization test system and experimentally investigates the characteristics of two-phase flow pattern distribution, pressure drop, and output voltage within the bending
-
Variations in gas temperature and average velocity during laminar-turbulent transition in high-speed gas flow through microtubes Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-21 Chungpyo Hong, Yutaka Asako, Gian Luca Morini, Mohammad Faghri
The primary objective of this study is to investigate variations in gas temperature and average velocity during the laminar-turbulent transition of compressible flow. This investigation encompasses an exploration of the effect of Mach number on transitional Reynolds number. Experiments were conducted utilizing a pair of adiabatic stainless steel microtubes with a diameter () of 131.6 μm. The first
-
Experiments on the evolution process of intermittent air-entraining vortices and its influencing factors Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-16 Kaiwen Yu, Changhai Han, Kang Han, Junfeng Shi
Surface vortices are a common hydraulic phenomenon at water intakes that adversely affect safe engineering operations. The complexity of vortex motion, the diversity of influencing factors, and the limitations of research methods make the formation and development mechanisms of vortices unclear. Some analytical and experimental studies on intermittent air-entraining vortices occurring at the horizontal
-
Experimental study on the droplet size distribution of radial orifice gas–liquid pintle injector at ambient pressure Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-15 Zhongpei Zhang, Yang Yang, Zhigong Tang, Yushu Jin, Xuan Jin, Chongzhi Liu
Pintle injector can achieve reliable and stable combustion of propellant, thereby greatly reducing the design difficulties of the combustion chamber. Droplet size, which has a great influence on the subsequent combustion process with high ambient pressure, is an important atomization characteristic. However, the influence of ambient pressure on the droplet size distribution of radial orifice gas–liquid
-
Influence of a restriction on flow patterns, void fraction, and pressure drop in gas–liquid pipe flow Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-13 Luis F.A. Alegría, L. Enrique Ortiz-Vidal, C.E. Álvarez-Pacheco, Johann E.C. Bolivar, Oscar M.H. Rodriguez
Subsurface safety valves play an important role in the hydrocarbon production process. The Brazilian industry is suffering significant losses due to the reduction of the useful life of this device, not to mention the risks associated with the operation and the environment. One possible reason for the failure of the subsurface safety valve’s reliability prediction may be the occurrence of two-phase
-
A low-cost electrowetting on dielectric semi-continuous pump for application to microfluidic reconfigurable devices Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-12 Behzad Parsi, Josh Augenstein, R. Daniel Maynes, Nathan B. Crane
An electrowetting on dielectric (EWOD) pump is a microfluidic pump that uses electrowetting to manipulate liquid droplets in a channel, offering an alternative approach to traditional mechanical pumps. EWOD-based pumps have significant potential for various microfluidic applications. For instance, by integrating microfluidic pumps with a radio frequency (RF) device, it is possible to create a microfluidic
-
Non-intrusive temperature measurements for transient freezing in laminar internal flow using laser induced fluorescence Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-11 Bouke Johannes Kaaks, Sebastian Couweleers, Danny Lathouwers, Jan-Leen Kloosterman, Martin Rohde
This work presents two color LIF temperature measurements for the transient freezing in a square channel under laminar flow conditions. This is the first time non-intrusive temperature measurements were performed within the thermal boundary layer during the transient growth of an ice layer in internal flow. A combination of a local outlier factor algorithm and a smoothing operation was used to remove
-
Aerodynamic investigation of the turbulent flow past a louvered-fin-and-tube automotive heat exchanger Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-11 Alessandro Zarri, Miguel Baena Botana, Julien Christophe, Christophe Schram
Turbulent flow past a radiator contributes to noise emission when interacting with a downstream cooling fan. This study examines turbulent flow characteristics downstream of a radiator, focusing on turbulence production, dissipation, non-homogeneity, and anisotropy. We assess turbulence models based on isotropy and homogeneity for noise prediction in real applications. Results show significant non-homogeneity
-
Ice accretion characteristics on rotating aeroengine fan blades Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-11 Linchuan Tian, Haiyang Hu, Ramsankar Veerakumar, Hui Hu
An experimental study was conducted to characterize the dynamic ice accretion process on rotating aero-engine fan blades to evaluate the icing-induced detrimental effects on the fan rotor performance. A scaled spinner-fan model was installed in an Icing Research Tunnel and exposed to typical rime and glaze icing conditions. It was found that, while ice structures accreted on both the suction and pressure
-
A visualization study on characteristics of severe slugging in the S-shaped riser with a kilometer-scale pipeline Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-08 Haiyang Yu, Qiang Xu, Bo Huang, Yeqi Cao, Liejin Guo
Severe slugging is a hazardous multiphase flow phenomenon in the process of offshore oil and gas transportation. Few visualization image data are obtained in experimental riser systems with kilometer-scale pipelines. Therefore, the interface distribution characteristics of severe slugging are visually investigated in a 29.1 m high S-shaped riser connecting a 1657 m long horizontal pipeline. Based on
-
Enhancing pool boiling in microgravity using micro-fins and an electrostatic field under different liquid subcooling Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-06 A.I. Garivalis, B. Liu, J. Wei, P. Di Marco
Despite boiling heat transfer is an effective way to remove heat and its performances comply with the high requirements of the electronics cooling and aerospace devices, in reduced gravity levels environments a decrease of the Critical Heat Flux (CHF) occurs. In the past decades, several techniques were developed to enhance the performances of a boiling system, such as external force fields and surface
-
The breakup and instability structures of liquid jets in subsonic crossflows Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-05 Vincent G. Shaw, Pierce Elliott, Matt Boller, Ephraim J. Gutmark
The breakup of water and Jet A fuel jets injected transverse into elevated temperature (up to 425 °C), combustion pre-heated, subsonic crossflows was investigated by internally fluorescing the liquid jet column. The fluorescent dye seeded test liquids were illuminated by a pulsed laser light that was transmitted within the injector using a quartz rod light-guide. High-resolution images isolating the
-
Optimizing stability and enhancing flow boiling heat transfer performance of Al2O3-TiO2/water hybrid nanofluids Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-03-02 Wenjie Guo, Yuling Zhai, Xiaoyan Huang, Zhouhang Li
[Display omitted]
-
Experimental evaluation of airlift pumps' thermal and mass transfer capabilities Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-29 Alexander Doucette, Shahriyar G. Holagh, Wael H. Ahmed
Airlift pumps are a versatile category of two-phase flow equipment principally employed for the transportation of liquids. Facilitating interfacial heat and mass transfer between gas and liquid phases, these pumps have the potential to serve as an efficient heat and mass exchanger in various industrial applications. Nonetheless, this capability of airlift pumps has remained relatively unexplored in
-
Two-phase air-water measurements in fully-rough free-surface flows Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-28 Jiayue Hu, Hubert Chanson
-
Experimental investigation of free-rising characteristics of spilled oil droplets in natural waters Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-21 Anqi Jiang, Longxi Han, Chenfang Wang, Xiangming Niu
This work focuses on investigating the dynamics of different types of oil droplets rising freely in water columns. Fifteen different types of oils were selected to cover most of the conventional oils. The particle size range of the study is 1.41∼13.58 mm, which can cover the largest oil droplet size that may occur in the real environment. Investigation results show that oil droplet characteristics
-
Experimental investigation on local flow structures of upward cap-bubbly flows in a vertical large-size square channel Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-19 Haomin Sun, Tomoaki Kunugi, Takehiko Yokomine, Xiuzhong Shen, Takashi Hibiki
Gas–liquid two-phase flows are typical in engineering systems involving heat and mass transfers. The cross-sectional geometries and sizes of these flow channels vary, exerting a notable impact on the thermofluid behavior. To develop thermofluid models, it is imperative to obtain local measurements of two-phase flows and gain insights into their characteristics from these measurements. Numerous experimental
-
Experimental study on the cavitation phenomenon effect on the efficiency of a turbulent premixed flame kerosene/air Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-16 L. Lamoot, B. Manescau, K. Chetehouna, E. Obame
In order to characterize the influence of cavitation in a nozzle on a turbulent premixed kerosene/air flame, an experimental study was conducted using a NexGen burner. This study was carried out in two distinct stages. The first stage was devoted to characterizing the necessary conditions for inducing the cavitation phenomenon, using a novel experimental device enabling fluidic study. The second stage
-
Dynamics of a buoyant collapsible tube under a free surface Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-14 R. Aashish, P. Deepu, Subrata Kumar
The non-linear dynamics of an extremely thin-walled collapsible tube carrying compressed air, surrounded by a denser fluid with a free surface are investigated. When the surrounding fluid is water, a wide range of dynamics in the oscillatory regime (OR) of the tube response are observed, including period-1, weak/strong aperiodic, and period-2 oscillations. However, aperiodic tube response dominates
-
Examining surface wetting and Leidenfrost transition of jet fuels and bicomponent mixtures Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-13 Ryan Werner, Eric Mayhew, Kenneth Kim, Chol-Bum Kweon, James B. Michael
The regime during droplet impact with high temperature walls is important for understanding the generation of fuel vapor and the potential production of pollutants during fuel spray impingement events. Experimental data on regime behavior and associated surface contact, which is closely linked with the heat transfer during the event, are needed to validate models and simulations focused on vaporization
-
Electric-field induced droplet stable vertical vibration: Experiments and numerical simulations Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-12 Ziqi Li, Yongzhou Luo, Rucheng Dai, Zhongping Wang, Xiaoyu Sun, Zengming Zhang
In this study, stable vertical vibration of a single droplet was stimulated through Electrowetting on Dielectric (EWOD) on a Polydimethylsiloxane-coated Indium Tin Oxide glass (PDMS-ITO) surface in an oil atmosphere. The mechanism of the vibration is clarified as a self-adjusted energy earning and losing equilibrium, and a small friction at the contact line is crucial for this stable vibration. We
-
PIV measurements of coherent vortices and turbulence production inside acoustic liner cavity with offset slit Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-12 Yuchao Tang, Peng Wang, Yingzheng Liu
This paper reports an experimental investigation into the vortex dynamics purely excited by periodic acoustic waves within a slit–cavity structure, which is a typical unit element of an acoustic liner for aeroengine applications. Particle image velocimetry (PIV) was used to measure the instantaneous, time-averaged and phase-dependent flow dynamics inside the slit–cavity, which is exposed to high-intensity
-
-
Calculating minimum droplet diameter in dripping, spindle, and cone-jet modes based on experimental data in the electrospray process Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-05 Shi Wang, Arian Yazdekhasti, As'ad Alizadeh, Ali Basem, Dheyaa J. Jasim, Ameer H. Al-Rubaye, Soheil Salahshour, Davood Toghraie
The paper is an experimental investigation of the effect of process parameters like applied voltage, volume flow rate and distance between two electrodes through dimensionless numbers in the electrospray process, droplet diameter in particular. In addition, this study attempts to present new estimated formulas based on experimental data to ease primary evaluations of droplet diameter before any performing
-
The effect of metal foam fins on pool boiling of DI-water Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-03 Arthur Gomes da Silva Vilaronga, Leonardo Lachi Manetti, Sameer Sheshrao Gajghate, Jeferson Diehl de Oliveira, Elaine Maria Cardoso
The technology industry's growth has motivated the development of optimized thermal control techniques, such as pool boiling. Different surface designs have been developed to enhance the heat transfer coefficient in different heat transfer applications. These designs aim to improve thermal performance, increase efficiency, and address specific challenges associated with heat exchange. Introducing porous
-
Impact dynamics and solidification behaviour of a molten droplet on a flat surface at different Weber numbers Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-02 Raju Chowdhury, Mohammad Mainul Hoque, Geoffrey Evans, Tom Honeyands, Brian J. Monaghan, David Scimone, Subhasish Mitra
-
Force and vortex shedding characteristics of a circular cylinder with flexible splitter plates Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-01 Pingping Shen, Weiguo Zhao, Hongjun Zhang, Zhengdao Wang, Hui Yang, Yikun Wei
In this paper, flow past a circular cylinder with various lengths of flexible splitter plate attachment is experimentally investigated. The dynamic behaviors of flexible plates are closely related to the Reynolds numbers () and plate length. For cases of = 1 and = 1.5, the flexible plates enter deflection mode with the increase of e. For long flexible plates ( > 2.5), a large deformation and periodic
-
An experimental investigation of adiabatic two-phase flow patterns in a slit microchannel with 1:800 aspect ratio Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-01 Yu.A. Dementyev, E.A. Chinnov, D.Yu. Kochkin, F.V. Ronshin, A.A. Evstrapov, V.S. Gusev, O.A. Kabov
To date, in the public domain there is a lot of experimental data on adiabatic two-phase flow in microchannels of various geometries (round, rectangular, square). However, microchannels with high aspect ratio (slit microchannels) remain poorly understood. In this article, an adiabatic two-phase flow in a slit microchannel with a height of 12.5 µm and width of 10 mm (aspect ratio 1:800) has been experimentally
-
Experimental assessment of film cooling from cylindrical holes subject to particulate deposition Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-02-01 Xing Yang, Zihan Hao, Zhenping Feng
Particulate deposition has become a significant challenge of developing more efficient film cooling configurations for hot turbine components. To assess the influence of particulate deposition and to better understand the coupling effects of deposition evolution and film cooling, experimental simulations were conducted by injecting low-melting-point wax particles into a low-temperature wind tunnel
-
Interaction of liquid films formed by two continuous jets impinging obliquely on a vertical wall Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-30 Sheng-ju Wang, Liang Guan, Xin-yuan Xu, Ming-yang Tan, Meng-yuan Liu, Wei-feng Li, Tian-liang Yao, Qing-guo Lin
The technology of liquid film by jet impingement is widely applied in aerospace, electronics and cleaning. In this paper, the spreading and evolution of the liquid films formed by two continuous jets impinging obliquely on a vertical wall are experimentally studied. The effects of the jet Weber number, jet inclination angle, nozzles spacing and angle between two jets on the films are examined. Results
-
Experimental investigation of permeability and Darcy-Forchheimer flow transition in metal foam with high pore density Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-26 Chuanwen Lv, Wei Li, Jiaxi Du, Jialin Liang, Huizhu Yang, Yonggang Zhu, Binjian Ma
Open-cell metal foams are a group of emerging porous materials with exceptionally large porosity that are becoming increasingly popular in a diverse range of applications such as heat exchanger and chemical reactors. However, the pressure drop characteristic of metal foam structure at high pore density remains largely unclear and unexplored. In this study, the permeabilities of 6 different copper foam
-
Investigation of convective heat transfer in a cold flow pebble bed nuclear reactor using advanced pebble probe heat transfer sensor Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-22 Muhna Alshammari, Ahmed Alalou, Saud Aldawood, Binbin Qi, Muthanna H Al-Dahhan
The aim of this study was to investigate the local heat transfer coefficients between the pebbles and the coolant gas in a PBR using an advanced measurement technique that consists of a heated pebble probe, a micro-foil heat flux sensor mounted flush on the surface of the heated pebble probe, and a thermocouple in the center of the bed void in front the sensor. In this work, the local heat transfer
-
Flight-ready Electrical Capacitance Tomography SMARTTS tank for use with cryogenics Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-20 M.D. Green, R. Foster-Turner, A. Hunt, A.M. Ramirez-Mancebo, S.C. Lieber, J.W. Hartwig, D. Moxey, A. Tafuni
The Atout SMARTTS (SMART Tanks for Space) system allows the propellant mass distribution in a storage vessel to be measured accurately under several motion and gravity conditions and at any fill level. Based on Electrical Capacitance Tomography (ECT), SMARTTS systems incorporate electrodes on the inside of the tank, electrical connections to these electrodes, and capacitance measurements. Interpretation
-
Spreading and splashing of liquid film on vertical hot surface by inclined jet impingement Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-19 Bolin Hu, Ting Zhao, Zhehang Shi, Weifeng Li, Qingguo Lin, Haifeng Liu, Fuchen Wang
In this paper, the liquid film formed by inclined jet impingement on the vertical hot wall is investigated by a high-speed camera. The effects of the jet velocity (5.5 m/s ≤ ≤ 14.6 m/s, 3804 ≤ ≤ 10098) and initial wall temperature (25 ℃≤ ≤ 250 ℃) on the spreading and splashing of the liquid film are explored. Although the jet velocity and initial wall temperature have little effect on the spreading
-
A comprehensive review of boiling heat transfer characteristics of wettability patterned surface Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-18 Linfeng Xiang, Yindong Song, Dongshu Yang, Xiaofeng Yang, Kambiz Vafai
In recent years, studies on patterned surfaces with different local wettabilities have emerged and developed. A number of peculiar structures are the most promising topographic ones in simultaneously enhancing CHF and HTC due to their high efficiency, and compatibility with other strengthening methods. Many studies have attempted to explore the optimal expression of wettability patterned surfaces for
-
Flow characteristics of dispersed two-phase flows in an 8 × 8 rod bundle Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-17 Meng Yu, Takashi Hibiki, Naofumi Tsukamoto, Shuichiro Miwa
Two-phase flows in rod bundles or tube bundles appear in heat transfer systems. The bundle-average (or one-dimensional) void fraction is a critical parameter in overall system design, performance evaluation, and safety assessment. Accurate bundle-average void fraction prediction requires a precise interfacial momentum transfer term formulated using the distribution parameter and drift velocity, two
-
Identification of the flow pattern from the experimental pressure signal in horizontal pipes carrying two-phase flows Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-17 Daniely Amorim das Neves, Saon Crispim Vieira, Juliana Rangel Cenzi, Aline Souza de Paula, Marcelo Souza de Castro, Adriano Todorovic Fabro
Two-phase flow is common in many industrial applications, especially in oil–gas production and transportation. Identifying the configuration of the phases along the flow is extremely important since the way they are distributed dictates the behaviour of the gradient of pressure and quantities such as the heat transfer coefficients of the mixture, while also being relevant in outflow guarantee issues
-
-
Evaporation and wetting behavior of water on the laser-textured silicon substrate Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-09 Jinxin Lai, Guang Chen, Qizheng Dong, Qiaoli Lin
It is important to elucidate the impact of surface micromorphology on the evaporation mechanism and behavior to design rational micromorphologies for enhancing/regulating evaporation. In this study, we investigated the wetting and evaporation behaviors of water droplets on monocrystalline silicon surfaces with concentric circular textures etched using a laser engraving system at varying spacing intervals
-
Experimental analysis of the near-nozzle direct injection spray for gasoline and ethanol-gasoline blended fuels Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-09 Anurag Gaur, Kaushik Saha, Devinder Pal Ghai
The current work analyses the spray during the early stage of development in the near-nozzle region using a single-hole gasoline direct injection system for gasoline (G100) and ethanol-gasoline (E85) blended fuels. The present work combined a Galilean-type beam expander with an achromatic lens, using an LED light and a high-speed camera to visualize a magnified view of the near-nozzle microscopic aspect
-
Laser interferometric detection of heat release rate perturbation field of acoustically perturbed laminar premixed flames Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-04 Xuanye Liang, Lijun Yang, Yue Zhang, Wei Hu, Yu Tian, Jingxuan Li
Laser interferometry, which was originally used to measure density perturbation, has been previously used to determine the heat release rate perturbation, which is a key factor in the analysis of combustion instability. However, its spatial accuracy is still unsatisfied. In the present work, an improved fringe Fourier analysis method is proposed to process the results obtained from the laser interferometry
-
A novel method of accurately characterizing heat pipes using thermoelectric modules Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-04 Eoin Guinan, Jeff Punch, Colin Butler, Vanessa Egan
This study details an experimental method for the accurate and rapid thermal characterization of low-intermediate temperature heat pipes (<200 °C). The aim of this work was to provide a method of measuring the thermophysical characteristics of heat pipes while providing definitive uncertainty values that enable accurate performance estimations prior to implementation into electronic systems. To achieve
-
Heat transfer in the melting of ice slurry during flow in a vertical slit channel Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2024-01-04 Beata Niezgoda-Żelasko
The article concerns the heat transfer process of ethanol ice slurry during downward and upward flow in a vertical slit channel (3x35.8x700 mm) under constant heat flux density conditions. Experimental studies were conducted for three initial concentrations of ethanol (Xvai = 10.5 %, 13.2 %, 15.8 %) and mass fractions of ice of 0 ≤ xs ≤ 30 %. For upward flow, heat transfer coefficients were 6–14 %
-
Planar light induced fluorescence quenching oxygen diffusivity measurement near the gas–liquid interface in aqueous glycerol and aqueous propylene glycol Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-27 Sören J. Gerke, Georg Brösigke, Jens-Uwe Repke
-
Onset of heterogeneous nucleation in pool boiling of HFE-7100 following rapid heating on a microscale heater Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-19 Amiav Lankry, Alex Koyfman, Herman D. Haustein, Yaakov Nir, Gennady Ziskind, Tali Bar-Kohany
Effective thermal management of electronics is crucial for maintaining their reliability, longevity, and optimal performance. As electronic devices become increasingly compact and powerful, the need to explore new and innovative methods for thermal management becomes ever more critical. Rapid transitions of power lead to temperature spikes (hotspots) of up to 100 K, and thus can dramatically increase
-
Thermal structure of an aluminum-methane/air hybrid flame Exp. Therm. Fluid Sci. (IF 3.2) Pub Date : 2023-12-23 Samuel Jeanjean, Justin Bertsch, Guillaume Legros, Christian Chauveau, Fabien Halter
The modification of our energetic mix is one of the crucial challenges to mitigate climate change. Various solutions are studied, and we will probably use most of them in the future. One of these solutions is metal combustion. Indeed, metals have important energy properties, and the combustion of metal powder does not produce greenhouse gases except NOx, and also generates oxides which can be extracted