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Coupling of Surface Plasmon Polaritons and Hyperbolic Phonon Polaritons on the Near-Field Radiative Heat Transfer Between Multilayer Graphene/hBN Structures Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2024-02-20 Jihong Zhang, Haotuo Liu, Bing Yang, Zao Yi, Qilin Cai, Xiaohu Wu
Near-field radiative heat transfer (NFRHT) between multilayer graphene/hBN heterostructures has been demonstrated to exceed the blackbody limit due to the coupling mechanism of surface plasmon pola...
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Thermodynamic control the self-assembled formation of vertically aligned nanocomposite thin film Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2024-02-14 Tahta Amrillah, Le Thi Quynh, Farizi Rachman, Ahmad Taufiq, Jenh-Yih Juang
Emergent exotic phenomena in the self-assembled process of vertically aligned nanocomposite (VAN) thin film remain under intensive studies. Insight exploration on the self-assembled formation from ...
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Elasto-Thermodiffusive Microtemperature Model Induced by a Mechanical Ramp-Type of Nanoscale Photoexcited Semiconductor Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2024-01-22 Kh. Lotfy, A. El-Bary, S. N. Daoud, M. H. Ahmed
In this study, a novel theoretical approach to describe thermo-optical elastic materials is proposed. This formulation offers insights into the relationship between plasma waves and thermomechanica...
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Subcooled Pool Boiling on Hierarchical Micro- and Nanostructure-Modified Copper Surfaces in HFE-7100 Dielectric Liquid Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2024-01-18 Shayan Davani, Bin Zhang, Brendon Doran, Luke Hansen, Mohammad Khan, Mahdi Roodbari, Wen Jin Meng, Arden L. Moore
Hierarchical surfaces comprised both microscale and nanoscale structures have been previously studied as a means of targeting multiple length scales to achieve superior pool boiling performance. Ho...
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Refinement of Thermal Conduction-Based Dew Condensation Detection on Target Solid Surface by Galvanic Arrays Sensor Chip Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2024-01-18 Moataz Mekawy, Iida Kazuya, Norifusa Satoh, Yukihiro Sakamoto, Jin Kawakita
A reliable early detection of dew condensation can efficiently protect target solid surfaces from numerous negative effects such as surface fogging and corrosion. Achieving this goal beneficially r...
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Flow and Heat Transfer in Two-Phase Flow Immiscible Droplets in Microchannels Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2024-01-18 Dariush Mehboodi, Reza Kamali, Saeed Kheirati Ronizi, Sina Amini Akbarabadi
The enhancement of heat transfer in microchannels without phase change is a significant area of study, primarily driven by the internal fluid recirculation in two-phase flows. This investigation fo...
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MHD Mixed Convection of Developing Slip Flow in a Vertical Porous Microchannel Under Local Thermal Non–Equilibrium Conditions Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2024-01-18 Abdollah Goli, Iman Zahmatkesh, Seyed Reza Saleh, Seyed Mahmoud Abolhasan Alavi
MHD mixed convection heat transfer of an ionized gas in a vertical microchannel filled with a porous medium is simulated and discussed in this study. The considered flow is hydrodynamically and the...
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Simultaneous Determination of Thermal Conductivity and Heat Capacity in Thin Films with Picosecond Transient Thermoreflectance and Picosecond Laser Flash Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-09-12 Zefang Ye, Janghan Park, Yanyao Zhang, Xianghai Meng, Matthew Disiena, Sanjay K. Banerjee, Jung-Fu Lin, Yaguo Wang
Combining the picosecond transient thermoreflectance (ps-TTR) and picosecond laser flash (ps-LF) techniques, we have developed a novel method to simultaneously measure the thermal effusivity and th...
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Effective Thermoelectric Switch of Hollow Weakly-Coupled Molecular Junction Based on Twist Angle Effect with Boron-Doping Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-08-29 Bei Zhang, Shidong Zhang, Gang Zhang
Rational design and adjustment of flexible thermoelectric devices are key points for sustainable and effective thermoelectric conversion, which remains a fundamental challenge due to inherent high ...
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An Investigation into the Roughness and Film Thickness Effects on the Interfacial Thermal Resistance Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-07-31 Jie-Yin Lin, Mei-Jiau Huang
The roughness and film thickness effects on the interfacial thermal resistance (ITR) are explored at two deliberately selected temperatures in use of Monte-Carlo simulation method. Particular metho...
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Study on Apoptosis of Squamous Cell Carcinoma Using Photothermal Therapy with Partial Injection of Gold Nanoparticles Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-06-04 Donghyuk Kim, Hyunjung Kim
Recently, the incidence of skin cancer has been increasing owing to the development of science and technology and the increase in outdoor activities. Research on photothermal therapy as a treatment...
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Medium-Bridge Near-Field Thermophotovoltaic System Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-04-21 Xin-Bo Zhang, Cheng-Long Zhou, Feng Gu, Xiao-Ping Luo, Yong Zhang, Hong-Liang Yi
The energy conversion performance of thermophotovoltaic (TPV) systems can be improved when the vacuum gap between the emitter and the TPV cell is at the near-field owing to the photon tunneling of ...
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High-Efficiency Spark Plasma Sintered Ge0.3Si0.7:P Thermoelectric Energy Converters with Silicone Phosphide as a Source of Phosphorus Doping Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-04-11 M.V. Dorokhin, Yu.M. Kuznetsov, P.B. Demina, I.V. Erofeeva, A.Yu. Zavrazhnov, M.S. Boldin, E.A. Lantsev, A.A. Popov, A.V. Boryakov, A.V. Zdoroveyshchev, M.V. Ved, D.A. Zdoroveyshchev, M.G. Korotkova
ABSTRACT A spark plasma sintering technology has already become rather common for the fabrication of GexSi1-x nanostructured thermoelectric solid solutions. Such trend is related with a number of opportunities and technological tools that enable precise properties manipulation. The present paper is devoted to discussing the modulation of GexSi1-x spark plasma sintering technique that consists in the
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The Tortuosity Effect on the Thermal Conductivity of Si Nanowires Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-04-05 Hao-Jhan Hong, Mei-Jiau Huang
ABSTRACT The thermal conductivity of tortuous silicon nanowires with constant cross section at room temperature was investigated in use of full-spectrum Monte-Carlo simulations. Various geometric features that can be possibly used to describe the tortuosity of the nanowires were studied and their relationships with the thermal conductivity were explored. Comparison of simulation results with experimental
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Near-Field Radiative Heat Transfer between $\beta-$GeSe monolayers: An ab initio study Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-03-19 R. Esquivel-Sirvent, A. Gusso, F. Sánchez Ochoa
ABSTRACT We present a theoretical study of the near-field radiative heat transfer (NFRHT) between two β-GeSe monolayers, each at a different temperature. (This is a relevant 2D material with superior electron transport and optical properties compared to black-phosphorus monolayers). The required optical conductivity of the monolayer is calculated using density functional theory including spin-orbit
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Thermal Insulation Performance of Monolithic Silica Aerogel with Gas Permeation Effect at Pressure Gradients and Large Temperature Differences Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-03-15 Hao-Qiang Pang, Sheng-Nan Zhang, Ting-Hui Fan, Xu Zhang, Tian-Yuan Liu, Yan-Feng Gao
ABSTRACT Silica aerogel is an excellent thermal insulator for high-speed aircraft, but there is little research on it in a high-temperature and complex-pressure environment. This research aims to evaluate the thermal insulation performance of silica aerogel monoliths with different porosities under large temperature differences and pressure gradients. We established an experimental system to measure
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Surface and Constriction Engineering of Nanoparticle Based Structures Towards Ultra-Low Thermal Conductivity as Prospective Thermoelectric Materials Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-02-17 Pasan Henadeera, Nalaka Samaraweera, Chathura Ranasinghe, Anusha Wijewardane
ABSTRACT The superior thermal insulating properties of nanostructured semiconductor materials over their bulk counterparts, make them promising candidates for Thermo-Electric (TE) applications. In this study, the superior thermal insulating properties of a new class of one-dimensional nanostructures made by sintering linearly placed nanoparticles, called Nano Particle Chains (NPC) are analyzed for
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Analysis of a Square Split-and-Recombined Electroosmotic Micromixer with Non-aligned Inlet-Outlet Channels Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-02-12 Amrendra Kumar, Nirmal K. Manna, Sandip Sarkar, Nirmalendu Biswas
ABSTRACT In micro-scale sensitive medicinal and biochemical systems, improving mixing efficiency with small velocity limitations is critical. This work examines the influencing key parameters and their implications on mixing efficiency in a new two-dimensional electroosmotic micromixer (EM) with nonaligned input and outlet microchannels. The micromixer uses electroosmosis force generated by microelectrodes
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Structural stability, electronic, magnetic, elastic, thermal, thermoelectric and optical properties of L21 and xa phases of Ti2fege heusler compound: GGA and GGA+U methods Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2023-01-23 M Y Raïâ, R Masrour, M Hamedoun, J Kharbach, A Rezzouk, A Hourmatallah, N Benzakour, K Bouslykhane
ABSTRACT Both L21 and XA type phases ordering of Ti2FeGe compound were investigated based on density functional theory. The structural, magnetic, band structure, density of states, possibility of martensitic transformation, elastic, thermoelectric and optical properties were studied. From the calculated total energy, we noted that L21 type in ferromagnetic state is more stable phase using GGA+U approach
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Enhanced near-field thermal radiation between black phosphorus with high electron density by BP/hBN heterostructures Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-11-28 Huadong Huang, Shiquan Shan, Zhijun Zhou
ABSTRACT The black phosphorus (BP)/hexagonal boron nitride (hBN) Van der Waals heterostructure has great potential application in BP-based devices due to its higher stability than monolayer BP film. The near-field thermal radiation (NFTR) between two identical BP/hBN heterostructures with high electron density is studied to promote the application of BP-based devices. The BP/hBN heterostructures show
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Thermal Performance Testing of a Solar Water Heating System Using Core-Shell Structured Nanofluids Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-11-20 İbrahim Atmaca, Osman Samet Özdemir, Ahmet Çağlar, Sezgi Koçak Soylu, Meltem Asiltürk
ABSTRACT This study investigates the impact of core-shell based nanofluids on the thermal performance of a solar water heating system by studying the changes in the useful heat gain and collector efficiency. This work would be the first to report the use of core-shell nanoparticles in solar water heating systems. The core-shell structure allows for dual improvements in thermal conductivity and better
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Gold nanoparticles as radiosensitizer for radiotherapy and diagnosis of COVID-19: A review Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-11-05 Abdul Khaliq Mokhtar, Norsyahidah Mohd Hidzir, Faizal Mohamed, Irman Abdul Rahman, Syazwani Mohd Fadzil, Afifah Mardhiah Mohamed Radzi, Nur Ain Mohd Radzali
ABSTRACT Radiotherapy is an established therapy in cancer treatments that uses energy deposition directly into tumor tissue. With the introduction of radiosensitizers, invasive surgical and chemotherapy techniques can be avoided. Radiosensitizers with a high-Z base such as gold nanoparticles (AuNPs) are promising candidates for catalyzing tumor injury and simultaneously enabling tracking to be done
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Investigation on Flow Through Staggered Micro Pin Fin Arrays with Variable Longitudinal Spacings Using Micro-PIV Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-09-21 Mingming Lv, Zhigang Liu, Wentao Chi, Chao Ma, Lian Duan
ABSTRACT In this study, the flow behavior of deionized water through the staggered circular micro pin fin arrays with three longitudinal spacings (SL = 2D, 3D and 4D) is investigated using flow visualization technology of micro particle image velocimetry (micro-PIV) in the range of Re = 100–800. The streamline distribution and velocity field in the three micro pin fin arrays are obtained. Experimental
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Through Plane Networked Graphene Oxide/Polyester Hybrid Thermal Interface Material for Heat Management Applications Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-09-20 Junaid Khan, Mariatti Jaafar
ABSTRACT The role of electronic devices in our lives is increasing rapidly, with more research focusing on miniaturization, creating more demand for thermal interface materials (TIM). Grease-based TIM presently available have good thermal conductivity values, but issues such as contamination, pump-out, and an additional curing step are observed. Fibrous textile substrates are soft and flexible, making
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Editorial for Issue 2/3 by Pamela M. Norris, Editor-in-Chief Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-09-18
Published in Nanoscale and Microscale Thermophysical Engineering (Vol. 26, No. 2-3, 2022)
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A parametric study of subcooled flow boiling of Al2O3/water nanofluid using numerical simulation and artificial neural networks Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-08-11 Hasan Alimoradi, Erfan Eskandari, Mahdi Pourbagian, Mehrzad Shams
ABSTRACT Utilizing an Euler-mixture three-dimensional numerical simulation for Al2O3/water nanofluid subcooled flow boiling in a mini channel, we study the effects of pressure, heat flux, nanoparticle concentration, surface roughness, and subcooled temperature on heat transfer quantities (average and local heat transfer coefficient, average and local vapor volume fraction, and average and local wall
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Heat transfer enhancement by pulsating flow of a viscoelastic fluid in a microchannel with a rib plate Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-07-03 Hao Wu, Chi Li, Jie Li
ABSTRACT In order to improve the heat transfer performance of the microchannel heat exchanger, a composite heat transfer enhancement method was proposed. Viscoelastic fluid was used as working fluid in pulsating flow condition, and rib plates were added to the microchannel to bring extra disturbance to the flow. The Oldroyd-B constitutive model of the viscoelastic fluid was used in the numerical simulation
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Experimental study on heat transfer enhancement of carboxylate multi-wall carbon nanotubes in a 3D pulsating heat pipe with a corrugated evaporator Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-05-17 Ali Reza Alizadeh Jajarm, Hamid Reza Goshayeshi, Kazem Bashirnezhad
ABSTRACT In this research, the thermal performance of a three-dimensional pulsating heat pipe with 11 turns is investigated experimentally. Carboxyl-functionalized multi-walled carbon nanotubes with 0.1 wt% in a water-based fluid are used as the operating fluid. Experiments are performed at 50% and 60% filling ratios, and the effect of grooving the evaporator tubes has also been investigated. Experiments
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Evaluation of Thermal Hydraulic Characteristics of a Two Phase Superhydrophobic Microfluidic Device using Volume of Fluid Method Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-05-04 Umair Aziz, Muhammad Nadeem, Feng Xin, Mustafa Kilic, Atta Ullah
ABSTRACT The slug flow in a superhydrophobic microchannel with a T-junction was studied computationally. The continuous phase passed through the main channel while the dispersed phase11. was introduced through the side channel. The volume of fluid (VOF) was employed to track the interface to study the dynamics of slug flow. First, a mesh independence study was carried out to select the optimum mesh
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Nanoscale fluid pumping using a symmetric temperature gradient: a molecular dynamics study Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-05-01 M. Sahebi, A.R. Azimian
ABSTRACT In this study, using the molecular dynamics simulation method, three systems for fluid pumping at the nanoscale have been proposed based on the thermo-osmotic mechanism. These pumps work by applying a symmetric temperature gradient along the wall of a nanopore, which is asymmetric in shape or material. The three systems are a composite nanotube, a conical nanotube, and a composite conical
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Thermal Protection Performances of the Macro and/or Nano Enhanced PCM in a Representative Battery Pack Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-04-27 Umit Nazli Temel, Ferhat Kilinc, Serkan Coskun
ABSTRACT This experimental study focused on the comparison of thermal protection performances of macro and/or nano enhanced organic PCM in a representative battery pack from low to high discharge rates. The macro/nano enhanced RT-44 provides the desired battery thermal protection requirements in terms of criteria such as maximum temperature and maximum temperature difference restriction and uniform
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Interfacial thermal conductance between gold and SiO2: A molecular dynamics study Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-04-27 S. Milad Hatam-Lee, Fatemeh Jabbari, Ali Rajabpour
ABSTRACT Silica coating on a gold nanoparticle can improve its thermal application in cancer thermotherapy. In this paper, the interfacial thermal conductance between gold and silica is calculated utilizing classical non-equilibrium molecular dynamics. It is revealed that the results of molecular dynamics are different from what has been predicted by the conventional diffuse mismatch model. Furthermore
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Thermal Annealing and Doping Induced Tailoring of Phase and Upconversion Luminescence of NaYF4:Yb Er Microcrystals Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2022-01-24 Shivanand H. Nannuri, Sana Adnan, Subash C K, Santhosh C, Sajan D. George
ABSTRACT The influence of Mn2+ ion concentration (x = 0–20 mol%) as well as the role of thermal-annealing temperature (400–600°C) on the structural as well as luminescence properties of NaYF4:Yb, Er (Y: 78-x%, Yb: 20%, Er: 2%) microcrystals prepared via a coprecipitation method is investigated. The cubic phase of the as-prepared NaYF4:Yb, Er (Y: 78%, Yb: 20%, Er: 2%) was found to remain intact upon
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Experimental Investigation on Flow Past an Isolated Micro Pin Fin Embedded in a Microchannel Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-12-27 Can Ji, Zhigang Liu, Mingming Lv, Jichao Li
ABSTRACT Micro pin fin heat sink is a very attractive cooling technique for high power density microelectronics. Optimization of its cooling performance requires insightful understanding on fundamental physics of flow inside it, especially around a single pin fin. In the present study, an experimental investigation on flow past an isolated low aspect ratio (height-to-diameter ratio) pin fin embedded
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Simultaneous Evaluation of Heat Capacity and In-plane Thermal Conductivity of Nanocrystalline Diamond Thin Films Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-11-17 Luke Yates, Zhe Cheng, Tingyu Bai, Karl Hobart, Marko Tadjer, Tatyana I Feygelson, Bradford B. Pate, Mark Goorsky, Samuel Graham
ABSTRACT As wide bandgap electronic devices have continued to advance in both size reduction and power handling capabilities, heat dissipation has become a significant concern. To mitigate this, chemical vapor deposited (CVD) diamond has been demonstrated as an effective solution for thermal management of these devices by directly growing onto the transistor substrate. A key aspect of power and radio
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Three-Dimensional Thermal Stress Effects on Nonlinear Torsional Vibration of Carbon Nanotubes Embedded in an Elastic Medium Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-12-14 Sardar S. Abdullah, Shahrokh H. Hashemi, Nazhad A. Hussein, Reza Nazemnezhad
ABSTRACT Nonlinear torsional vibration of nanorods embedded in an elastic medium under three-dimensional thermal stresses is investigated in this study. The scale effect is introduced to the equation of motion using the nonlocal theory. The nanorods are under the effect of a three-dimensional thermal environment. The elastic medium is modeled by infinite rotational springs around the nanorod. Galerkin’s
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Local Nonequilibrium Electron Transport in Metals after Femtosecond Laser Pulses: A Multi-Temperature Hyperbolic Model Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-09-30 S. L. Sobolev
ABSTRACT The trend toward miniaturization of electronic devices has increased the interest in nano scale heat transport, particularly, in laser-excited solids where electron–electron thermalization and electron-phonon coupling play a key role. Using a multi-temperature hyperbolic model, which takes into account the coupling between initially non-thermalized electrons and different phonon branches,
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Optical Analysis and Optimization of Micropyramid Texture for Thermal Radiation Control Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-08-02 Jonathan Sullivan, Ziqi Yu, Jaeho Lee
ABSTRACT While anti-reflective properties of pyramid texture are widely used, their use for thermal radiation control has received relatively little attention and the understanding of geometric parameters for design optimization is not well established. Here we use finite-difference time-domain simulations in conjunction with an algorithm to optimize thermal characteristics of micropyramid-textured
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Temperature and Strain Effects in Micro-Raman Thermometry for Measuring In-Plane Thermal Conductivity of Thin Films Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-04-11 Shouyuan Huang, Yijie Chen, Zhe Luo, Xianfan Xu
ABSTRACT Micro-Raman thermometry is an effective method for measuring thermal conductivity of thin films. It features noncontact and nondestructive probing and convenience of sample preparation. However, there is a concern of its accuracy when using the Raman peak shift as the temperature transducer since it responds to both temperature and strain upon optical heating. In this work, a series of detailed
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Modulating Near-Field Radiative Heat Transfer through Thin Dirac Semimetal Films Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-05-15 Guoding Xu, Jian Sun, Hongmin Mao, Zhaoliang Cao, Xiying Ma
ABSTRACT We propose a thermal modulation structure made of two identical SiO2 slabs coated by Dirac semimetal (DSM) films and separated by a nanoscale vacuum gap. The energy transmission probability reveals that the coupled surface plasmon polaritons (SPPs) between the two DSM films, and the surface phonon polaritons (SPhPs) supported by the SiO2 substrate can vary sensitively with the Fermi level
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Nonequilibrium Green’s functions (NEGF) in vibrational energy transport: a topical review Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-04-19 Carlos A. Polanco
ABSTRACT Recent advances in fabrication techniques have enabled the development of materials sculpted at the nanoscale (~10 nm). These “nano-materials” could revolutionize thermal management technologies by providing novel ways to manipulate energy propagation in solids. Atomistic simulations are critical to forging this revolution, given their ability to describe a system’s dynamics on an atom by
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Impact of Electron-Phonon Interaction on Thermal Transport: A Review Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-04-03 Yujie Quan, Shengying Yue, Bolin Liao
ABSTRACT A thorough understanding of the microscopic picture of heat conduction in solids is critical to a broad range of applications, from thermal management of microelectronics to more efficient thermoelectric materials. The transport properties of phonons, the major microscopic heat carriers in semiconductors and insulators, particularly their scattering mechanisms, have been a central theme in
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Advanced Micro-/Nanostructured Wicks for Passive Phase-Change Cooling Systems Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-03-25 S. Movaghgharnezhad, J. Darabi
ABSTRACT Heat pipes and vapor chambers have been widely utilized for the thermal management of electronic devices due to their effective heat transport, passive cooling operation, and high reliability. In these devices, a wick structure transports a working fluid from the heat sink to the heat source via capillary action in the wick structure. This paper provides a broad overview of the latest studies
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Hyperbolic volume and surface phonon polaritons excited in an ultrathin hyperbolic slab: connection of dispersion and topology Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2021-02-04 Xiaohu Wu, Ceji Fu
ABSTRACT Hyperbolic volume and surface phonon polaritons have been studied extensively for enhancing the near-field radiative heat transfer (NFRHT) between hyperbolic materials. Hyperbolic volume phonon polaritons (HVPPs) describe propagating electromagnetic waves in hyperbolic materials while evanescent waves are required for excitation of hyperbolic surface phonon polaritons (HSPPs). Therefore, the
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Drifting mass accommodation coefficients: in situ measurements from a steady state molecular dynamics setup Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-12-29 Yigit Akkus, Akif Turker Gurer, Kishan Bellur
A fundamental understanding of the evaporation/condensation phenomena is vital to many fields of science and engineering, yet there is much discrepancy in the usage of phase change models and associated coefficients. First, a brief review of kinetic theory of phase change is provided, and the mass accommodation coefficient (MAC, $\alpha$) and its inconsistent definitions are discussed. The discussion
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Forming the Convective Flows and a Cluster of Particles under Spot Heating Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-12-13 S.Y. Misyura, R.I. Egorov, V.S. Morozov, A.S. Zaitsev
ABSTRACT The behavior of self-organization of convective flows in a thin layer of liquid under point (local) heating is investigated experimentally. The interaction of thermocapillary and thermogravitational-free convection can lead both to self-organization of a cluster of micro-vortices in the form of hexagonal structures and to its partial disintegration. Correlation analysis of the velocity field
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The effect of surface morphology on the rate of phase change of micron and sub-micron sized 2-D droplets Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-12-08 Mohammad Rezaeimoghaddam, Zafer Dursunkaya
ABSTRACT Heat transfer via phase change is a major contributor to heat removal in numerous engineering applications. Thin films of liquid result in increased heat transfer due to a reduction of conduction resistance, in addition the pressure jump at the liquid-vapor interface also affects the rate and direction of the rate of phase change. Because of these effects the morphology of the substrate surface
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The effect of surface morphology on the rate of phase change of micron and sub-micron sized 2-D droplets Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-10-01 Mohammad Rezaeimoghaddam, Zafer Dursunkaya
ABSTRACT Heat transfer via phase change is a major contributor to heat removal in numerous engineering applications. Thin films of liquid result in increased heat transfer due to a reduction of conduction resistance, in addition the pressure jump at the liquid-vapor interface also affects the rate and direction of the rate of phase change. Because of these effects the morphology of the substrate surface
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Near-field electromagnetic heat transfer through nonreciprocal hyperbolic graphene plasmons Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-10-01 ChengLong Zhou, Shui-Hua Yang, Yong Zhang, Hong-Liang Yi
ABSTRACT In the present work, we theoretically demonstrate that near-field radiative heat transfer (NFRHT) can be modulated and enhanced by a new energy transmission mode of evanescent wave, i.e. the nonreciprocal hyperbolic surface plasmon polaritons (NHSPPs). It is well known that by patterning a single layer of graphene sheet into ribbons, the closed circular dispersion of graphene plasmons is opened
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Coupling Mesoscopic Boltzmann Transport Equation and Macroscopic Heat Diffusion Equation for Multiscale Phonon Heat Conduction Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-10-01 W. Cheng, A. Alkurdi, P.-O. Chapuis
ABSTRACT Phonon heat conduction has to be described by the Boltzmann transport equation (BTE) when sizes or sources are comparable to or smaller than the phonon mean free paths (MFPs). When domains much larger than MFPs are to be treated or when regions with large and small MFPs coexist, the computation time associated with full BTE treatment becomes large, calling for a multiscale strategy to describe
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Reconsidering Uncertainty from Frequency Domain Thermoreflectance Measurement and Novel Data Analysis by Deep Learning Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-08-19 Wenqing Shen, Diego Vaca, Satish Kumar
ABSTRACT Frequency-domain thermoreflectance (FDTR) is a popular technique to investigate thermal properties of bulk and thin film materials. The FDTR data analysis involves fitting experimental data to a theoretical model whose accuracy may be affected by improper fitting approach and by convergence to local minima. This work proposes a novel data analysis approach using deep learning techniques. The
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Induction heating response of iron oxide nanoparticles in varyingly viscous mediums with prediction of brownian heating contribution Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-08-12 Joshua Tompkins, David Huitink
ABSTRACT This study examines the effects of nanoparticle concentration, magnetic field frequency, and carrier fluid viscosity on the induction heating response of nanofluids exposed to an alternating magnetic field. Uncapped iron-oxide nanoparticles with a mean diameter 14.42 nm were sonically dispersed into mixtures of deionized water and ethylene glycol (WEG) as well as highly viscous oil blends
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Molecular Dynamics Study of Interactions between the Water/ice Interface and a Nanoparticle in the Vicinity of a Solid Surface Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-04-02 Shota Uchida, Kunio Fujiwara, Masahiko Shibahara
ABSTRACT In this study, non-equilibrium molecular dynamics simulations were conducted for a coexistence system of water and ice on a wall surface with a single nanoparticle to reveal the effects of water solidification on the nanoparticle in the vicinity of a wall surface. We further investigated the effect of the presence and size of particles on the density profile of water in the vicinity of the
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Thermal Wave in Phonon Hydrodynamic Regime by Phonon Monte Carlo Simulations Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-04-02 Ben-Dian Nie, Bing-Yang Cao
ABSTRACT Thermal wave, namely wavelike behavior of heat propagation in transient heat conduction, enjoys much attention due to the recent investigations into phonon hydrodynamics in low-dimensional materials. In this paper, an improved phonon Monte Carlo (MC) simulation algorithm is developed based on the Callaway’s dual relaxation time approximation model, which can deal with the coupling of normal
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Enhanced Pool Boiling Performance of Microchannel Patterned Surface with Extremely Low Wall Superheat through Capillary Feeding of Liquid Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-04-02 Fengxun Hai, Wei Zhu, Shiqiang Liang, Xiaoyi Yang, Yuan Deng
ABSTRACT The pool boiling performance plays a key role in the development of high heat flux dissipating applications. The high critical heat flux and low wall superheat are two of the critical factors that affect the long-term life of devices. In this paper, enhanced pool boiling performance can be achieved by well-designed microchannels in copper surfaces using a precision diamond dicing method. The
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Mean Free Path–Thermal Conductivity Accumulation Calculations for Wurtzite Gallium Nitride: Two Approaches Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-04-02 Ilke Albar, Nazli Donmezer
ABSTRACT Understanding the mean free path distribution of the dominant heat carriers is very important in determining the ballistic to diffusive heat transport transition in nanoscale devices. This is true for the high electron mobility transistors made from GaN where both the thickness of the buffer layer and localized heating causing ballistic-diffusive heat transfer may complicate the transport
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Fundamental Limits of the Dew-Harvesting Technology Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2020-01-02 Minghao Dong, Zheng Zhang, Yu Shi, Xiaodong Zhao, Shanhui Fan, Zhen Chen
ABSTRACT Dew-harvesting technology radiatively cools a condenser below the dewpoint to achieve condensation of the water vapor from the atmosphere. Due to its passive nature, this technology has attracted broad interest, in particular in the context of the worldwide drinking-water scarcity. However, the fundamental limit of its performance has not yet been clarified. Moreover, the existing applications
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The heating of magnetic nanoparticles in a rotating magnetic field Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2019-11-12 Nikolai A. Usov, Olga N. Serebryakova, Elizaveta M. Gubanova
ABSTRACT The specific absorption rate of magnetic nanoparticles in a rotating magnetic field has been calculated taking into account both thermal fluctuations of the particle magnetic moments and strong magneto-dipole interactions in nanoparticle clusters with various filling factors. For an assembly of interacting superparamagnetic nanoparticles, the maximal values of the specific absorption rate
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Investigation of Nucleate Pool Boiling of Saturated Pure Liquids and Ethanol-Water Mixtures on Smooth and Laser-Textured Surfaces Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2019-11-06 Peter Zakšek, Matevž Zupančič, Peter Gregorčič, Iztok Golobič
ABSTRACT Nucleate pool boiling experiments were performed on plain and five laser-textured stainless-steel foils using saturated pure water, 100% ethanol, 0.4% and 4.2% mole fraction ethanol – water mixtures. All laser-textured samples contained untreated, smooth 0.5 mm wide regions and intermediate textured surfaces, that differ in the width of the laser patterned regions (from 0.5 mm to 2.5 mm).
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Effect of Evanescent Waves on the Dark Current of Thermophotovoltaic Cells Nanoscale Microscale Thermophys. Eng. (IF 4.1) Pub Date : 2019-10-24 Dudong Feng, Eric J. Tervo, Shannon K. Yee, Zhuomin M. Zhang
ABSTRACT The output power of thermophotovoltaic (TPV) cells may be greatly increased when the gap between the emitter and cell is reduced to submicron distances (near-field regime), at which photon tunneling due to evanescent waves becomes important. Accurate modeling of TPV cells in these conditions is crucial for the design and optimization of near-field TPV systems. The conventional or standard