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Severe Mn vaporization for partial-penetrated laser keyhole welds of high-manganese cryogenic steel Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-20 Myeonghwan Choi, Dae-Won Cho, Kwang-Hyeon Lee, Seonghoon Yoo, Sangyong Nam, Namhyun Kang
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Forced convective heat transfer performance of foam-like structures – comparison of the Weaire-Phelan and the Kelvin structures with real metal foam Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-20 Zhaoda Zhang, Guanghan Yan, Mingrui Sun, Shuai Li, Xiaokai Zhang, Yongchen Song, Yu Liu
Real foam and foam-liked structures have been widely used in the field of flow and heat transfer but whether foam-like structures can be used as an alternative to metal foams for forced convective heat transfer needs to be further investigated. In this study, three foam structures (Weaire-Phelan, Kelvin and metal foam) were compared by simulation under turbulent conditions and the flow heat transfer
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Detailed spray analysis of airblast atomization of various fuels in a reacting environment Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-20 Réka Anna Kardos, Erika Rácz, Milan Malý, Jan Jedelský, Viktor Józsa
Understanding spray evolution in a reacting environment is critical to designing advanced, clean combustion systems. The processes in the upstream region determine flame shape, stability, ignition characteristics, pollutant emission, and combustion efficiency. The developed spray is never achieved in combustion since the early regions feature primary and secondary atomization, while droplets evaporate
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The pool boiling heat transfer of ammonia/Fe3O4 nano-refrigerant in the presence of external magnetic field and heat flux: A molecular dynamics approach Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-19 Qing An, Ali Basem, As'ad Alizadeh, Saeed S. Kamoon, Mortatha AL-Yasiri, Mengyan Zhang, Z. Li, Soheil Salahshour, M. Hekmatifar
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A dual grid-based deep reinforcement learning and computational fluid dynamics method for flow control and its application to nucleate pool boiling Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-18 Harshal S. Raut, Amitabh Bhattacharya, Atul Sharma
This paper presents a of a dual grid (DG)-based coupled deep reinforcement learning (DRL) and computational fluid dynamics (CFD) method for active flow control. The DG-DRL-CFD method uses a dual-resolution grid, with a coarser grid for the training phase and a finer grid for the testing phase of the DRL-CFD method. Further, after a for our DRL-CFD-based parallelized in-house solvers, this paper presents
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Effects of forced convection on pool boiling heat transfer of metal foams: Numerical analysis and experimental validation Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-18 Song Deng, Kun He, Side Ren, Haitao Hu
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Research on the effect of inclination angle on flow boiling heat transfer characteristics in smooth tubes Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-17 Xin zhang, Jianxin Shi, Baozhi Sun
The tube of marine heat exchangers is inclined under the action of wind, wave and current, which changes the flow and heat transfer characteristics and thus poses a threat to the safe and stable operation of the heat exchanger equipment. In this study, the Eulerian-Eulerian two-fluid model is applied to simulate the flow boiling and boiling crisis process in 5 upward flowing inclined tubes with inclination
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Experimental study on the effects of water hardness during transient pool boiling and the development of an artificial neural network Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-17 Ahmadreza Ayoobi, Ahmadreza Faghih Khorasani, Mehdi Barzegar, Mohammad Hossein Noriyan Zavare
An increase in water hardness is an unexplored factor that could affect the heat transfer rate in pool boiling. Experimental investigations were conducted on transient pool boiling at saturation temperature using mineral, domestic, and deionized (DI) water to assess the influence of water hardness on heat flux and critical heat flux (CHF). An increase in heat flux, following a quadratic function of
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A quick measurement method of heat transfer coefficient and friction factor for finned tube bundle of the air cooler under large temperature difference Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-17 Yongyong Wu, Yang Liu, Zhen Zhang, Qun Xiang, Yanfei Sun, Xingtuan Yang, Shengyao Jiang
The annular finned tube bundle of air cooler serves as an essential heat exchanger to perform passive decay heat removal from the reactor core to the ultimate heat sink in the NHR200-II small modular nuclear reactors. The performance of heat transfer and flow resistance is crucial for nuclear safety as a finned tube bundle operates under natural circulation involving a significant temperature difference
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Hyperthermal erosion of knitted graphene-nanoribbon sheet under atomic oxygen bombardment Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-17 Ju Tang, Jin Zhao, Guice Yao, Haoyun Xing, Yingfei Cao, Dongsheng Wen
With outstanding thermal, mechanical, and chemical properties, graphene has been proposed as a promising heat shield material for hypersonic applications. Knitted graphene composites have shown further improved properties, whose behavior under highly non-equilibrium hyperthermal conditions, however, is still unknown. This work investigates the hyperthermal erosion and mechanical behaviors of 2D and
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Role of the volume-specific surface area in heat transfer objects: A critical thinking-based investigation of Newton's law of cooling Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-17 István W. Árpád, Judit T. Kiss, Dénes Kocsis
In this research, the process whereby objects are cooled (or heated) is reconsidered by studying Newton's law of cooling. The findings of the study highlight the important relationship between the volume-specific surface area of objects and the dynamics of heat content change; that is, the rate at which the temperature of an object decreases is shown to additionally depend on the size of the volume-specific
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Heat transfer improvement of phase change materials by metal foams and nanoparticles for efficient electronic thermal management: A comprehensive study Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-17 Ibtissam Afaynou, Hamza Faraji, Khadija Choukairy, Müslüm Arıcı, Kaoutar Khallaki
In recent decades, ensuring efficient thermal control of electronic components (ECs) has emerged as a critical concern. To address this, phase change materials (PCMs) are increasingly utilized to augment passive thermal management efficiency. In this work, a two-dimensional numerical study is conducted to investigate the melting of the PCM (n-eicosane) composited with metal foam (MF) and/or nanoparticles
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Utilizing Ragone framework for optimized phase change material-based heat sink design in electronic cooling applications Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-17 Ayushman Singh, Srikanth Rangarajan, Bahgat Sammakia
This study explores the latent thermal energy storage potential of an organic phase change material with porous copper foam and its applicability in electronic cooling under varying heat load conditions. The organic phase change material, n-eicosane, is known for its inherently low thermal conductivity of 0.15 W/mK, rendering it vulnerable during power spikes despite its abundant latent heat energy
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Experimental optimization of butterfly-shaped film cooling hole configuration with a 30 degree injection angle Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-16 Jin Young Jeong, Ye Rim Jo, Gi Mun Kim, Young Jun Kang, Min Seok Kang, Jae Su Kwak
Film cooling is one of the external cooling techniques that is widely applied to the hot-gas path components of a gas turbine, forming a thin film of a coolant on the surface to prevent the direct convective heat transfer between combustion gas and components. The film cooling effectiveness (FCE) is significantly influenced by the geometry of the injection hole. Therefore, it is important to adjust
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Experimental study and prediction of flow instability of supercritical nitrogen in a vertical upward tube Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-16 Runfeng Xiao, Liang Chen, Yu Hou, Zixin Zhang, Hongyu Lv
Supercritical cryogenic fluids are widely used in thermal equipment for liquid air energy storage (LAES), hypersonic aircraft, liquid hydrogen, etc. Unstable flow of supercritical fluids can cause thermal fatigue, mechanical vibration, noise, etc. In this work, a cryogenic heat transfer system was established to study the flow instability characteristics of supercritical nitrogen (SN) in a vertical
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Impact of rock heterogeneity on reactive flow during acid stimulation process Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-16 Cunqi Jia, Saif Alkaabi, Jinchuan Hu, Kamy Sepehrnoori, Jun Yao, Lei Zhang
Acid stimulation within carbonate rocks represents a crucial aspect of reactive flow applications in subsurface porous media and has been widely used in carbonate reservoir development attributed to its rapid effectiveness and cost-efficiency. This study is motivated to investigate further the impact of rock heterogeneity on the acid stimulation process. The two-scale continuum model is employed for
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Simultaneous measurement of cross-plane thermal conductivity and interfacial thermal conductance of nano-metal films on a low thermal diffusivity substrate using TDTR Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-16 Yantao Zeng, Lin'an Li, Shibin Wang, Fangyuan Sun, Zhiyong Wang, Xinhao Tu, Chuanwei Li
The thermal transport properties are very significant for the performance, reliability, and service life of nano-electronic devices. However, effectively measuring the thermal transport properties of nano-metal films is a challenge job, especially for the interfacial thermal conductance between nano-metal films and substrate with low thermal diffusivity. In this study, we improve the traditional time-domain
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In memoriam - Professor Shigefumi Nishio (1949-2022) Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-15 Ryo Shirakashi, Niro Nagai, Hiroyasu Ohtake, Masahiro Shoji, Vijay K. Dhir
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Electric field-effect thermal transistors and logic gates Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-13 Deyu Xu, Junming Zhao, Linhua Liu
A prototype of electric field-effect thermal transistor (EFETT) and the derived thermal logic gates are proposed, using electric potentials as inputs and temperature as outputs. The EFETT works on the modulation of near-field thermal photons transferred between the source and the drain semiconductors by the electric field-effect induced by gate voltage, thus altering the heat current and terminal temperature
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Heat transport characteristics of a flat-evaporator loop heat pipe for use in a thermal management system of electric vehicles Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-13 Bomi Nam, Wukchul Joung
In this work, a flat-evaporator loop heat pipe (FELHP), with a 100 cm rectangular thermal interface and an overall length of approximately 2 m was devised for the thermal management of electric vehicles. A simple rectangular-cuboid evaporator was devised using a novel stepped-flat wick structure, and the heat transport characteristics were systematically investigated in terms of the heat load, relative
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Experimental study on transpiration cooling through additively manufactured porous structures Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-13 Carolina Poupinha, Sylwia Kozlowska, Javier Soriano Lluch, Davide Altimare, Mats Kinell
Film cooling and thermal barrier coating are the most common external cooling techniques used for gas turbine components. In film cooling, coolant air is brought to the external surface via rows of discrete holes. This study investigates an alternative geometry, referred to as transpiration cooling. Here, the coolant air is brought to the external surface through an additively manufactured porous structure
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A novel model of the anisotropic thermal conductivity of composite phase change materials under compression Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-13 Li-Kai Mao, Qun Liu, Hua Chen, Wen-Long Cheng
Anisotropic composite phase change materials (CPCMs), as thermally conductive materials, are typically compressed to reduce contact thermal resistance in thermal control systems. However, the effect of compression on the anisotropic heat transfer properties of CPCMs is rarely studied. Therefore, a model for determining the anisotropic thermal conductivity of thermally conductive CPCMs under compression
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Flow dynamics and heat transfer analysis of a sweeping air jet – An experimental approach Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-13 Rita Gomes, Flávia V. Barbosa, José C.F. Teixeira
Technological and environmental constraints are driving the development of enhanced heat transfer alternatives. In this context, the scope of this study encompasses sweeping jets generated by fluidic oscillators, which offer considerable potential for enhancing heat transfer. Initially, an experimental setup was developed to measure the flow velocity using a Laser Doppler Anemometer (LDA) and the heat
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Comprehensive analysis of airflow stream interaction, space utilization and optimization of an aligned configured air-cooled Li-ion battery pack Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-12 Satya Prakash Verma, Samir Saraswati
The spacing in a lithium-ion battery pack is crucial in various aspects; including mechanical stability, heat dissipation, temperature distribution, thermal coupling, and cooling effectiveness. This research aims to enhance the cooling efficiency of a 24 V, 10Ah, 4P7S aligned battery pack by optimizing the distribution of spacing among the battery cells. The parameters examined in this study are the
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Optimization of the film cooling hole for minimizing stress concentration factor based on surrogate model Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-12 Shanyou Wang, Siyuan Zhang, Xueying Li, Jing Ren
Film cooling is a typical cooling technology in gas turbines that can lower heat load by spreading coolant on the blade's surface. However, it faces the problem of stress concentration. The present work focuses on optimizing the film cooling hole for minimizing the stress concentration factor based on the surrogate model. The stress concentration factor is the ratio of the maximum stress in a plate
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A refined cylinder fire model for thermal radiation calculation from localized fire to exposed horizontal surface Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-12 Junjie Wei, Chao Zhang
Fire is the most frequent hazard to buildings. The current design methods for predicting the temperatures of structures in fire are originally developed for the standard fire that assumes a uniform gas temperature field and are invalid for natural fires with high non-uniform gas temperature fields. Localized fire is a typical natural fire with high non-uniform gas temperature field, which is often
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Mitigation of porosity in adjustable-ring-mode laser welding of medium-thick aluminum alloy Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-12 Jianmin Li, Shaoning Geng, Yilin Wang, Chunming Wang, Ping Jiang
Adjustable-ring-mode laser welding (ARM-LW) offers a novel approach to minimize porosity in medium-thickness aluminum alloy joints. However, the suppression mechanism and optimization strategy of reducing porosity for ring-mode laser remain unclear. A combination of experiment and simulation was utilized to narrow the gap. The findings demonstrated that ring-mode laser effectively slows the increase
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Study on evaporation induced flow characteristics and interfacial phenomena of water in a sidewall-heated cylindrical pool at low pressures Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-11 Si Bo Wan, Fan Zhang, Li Zhang, Chun-Mei Wu, You-Rong Li
The fundamental connection among interface phenomena, flow characteristics and energy transport during the evaporation process is crucial. In this work, a combination of experimental measurements and numerical calculations is used to study the water evaporation and the induced thermal convection in a cylindrical pool at low pressures. The temperature axial and radial distributions of the liquid and
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Reduced-order modeling of conjugate heat transfer in lithium-ion batteries Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-11 Vijay Kumar Reddy Vuppula, Muralikrishnan Ramanujam, Venkataramana Runkana
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New dimensionless equation for mass transfer at evaporation of open liquid surface in mixed or forced convection Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-11 Evelin VARJU, Tibor POÓS
The process of evaporation can be grouped into 48 different cases depending on the conditions and properties of the gas and liquid. The publications found in the literature and the correlations specifying the evaporation rate can be classified into these cases. A new dimensionless equation was created that gives the value of the evaporation rate in the case of evaporation with steady-state gas and
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Dynamic thermal response characteristics of a metal foam enhanced horizontal loop thermosyphon Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-10 Yinfeng Wang, Huicong Yao, Guiqiang Li, Yuezhao Zhu
A metal foam horizontal loop thermosyphon (MF-HLTS) for a solar receiver was proposed and investigated under the variable conditions. Meanwhile, a dynamic response model for predicting the thermal response characteristics of MF-HLTS was established using Nusselt theory and lumped parameter method. Results of the dynamic model show good agreement with the experimental data, with a maximum deviation
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Drop rebounding on heated micro-textured surfaces Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-10 M. Toprak, N. Samkhaniani, A. Stroh
This study investigates the hydrodynamics and heat transfer of a droplet impinging on a heated superhydrophobic surface at low Weber numbers with subsequent bouncing through numerical simulations in the phase-field framework. These structure-resolved simulations take into consideration the entrapment of air during impingement on the micro-textured surface and effectively replicate the hydrodynamic
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Target-driven splitting SPH optimization of thermal conductivity distribution Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-10 Bo Zhang, Chi Zhang, Xiangyu Hu
Efficiently enhancing heat conduction through optimized distribution of a limited quantity of high thermal conductivity material is paramount in cooling electronic devices and numerous other applications. This paper introduces a target-driven all-at-once approach for PDE-constrained optimization and derives a splitting smoothed particle hydrodynamics (SPH) method for optimizing the distribution of
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Extraordinary thermal conductivity for carbon nanotube encapsulated linear carbon chain Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Hanying Zou, Yanhui Feng, Xiaolong Tang, Xinxin Zhang, Lin Qiu
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Influence of flow inertia on the frost formation for vertical surface with and without superhydrophobic coating Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Jia-Wei Zheng, Yu-Sheng Xie, Yu-Lieh Wu, Kai-Shing Yang, Chi-Chuan Wang
The aim of this study is to investigate the effect of flow velocity on the heat and mass performance of vertical surfaces. The superhydrophobic surface were prepared by surface chemical spraying, and the copper and superhydrophobic surfaces were placed in an environmental chamber for the experiments. In the experiments, different velocities and surface temperatures for copper and superhydrophobic surface
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Anisotropic thermal diffusivity measurement of thin films: From a few to hundreds of microns Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Yanhui Zhang, Rui Xu, Yi Liu, Qinmeng Jiang, Qinyi Li, Yingjun Liu, Jianli Wang
The thermal transport properties of thin films have garnered significant research interest due to their diverse applications in new energy sources and thermal management. As the thickness of anisotropic thin films decreases to a few microns, conventional laser flash analyzer and infrared lock-in thermography encounter difficulties in characterizing their thermophysical properties. In response to this
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Numerical investigations of melting process with sidewall heating under various control parameters Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Jin Hu, Shengqi Zhang, Zhishun Yang, Lihua Chen, Zhenhua Xia
The study numerically investigates the melting of phase change material in a two-dimensional rectangular region with an aspect ratio of 10/7 under sidewall heating conditions, utilizing the enthalpy method. It comprehensively examines the effects of varying Rayleigh numbers (), Prandtl numbers (), and Stefan numbers (), corresponding to different material properties and operating conditions. The results
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Dual-tracer laser-induced fluorescence thermometry for understanding bubble growth during nucleate boiling on oriented surfaces Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Mahyar Ghazvini, Mazen Hafez, Cristian Pena, Philippe Mandin, Rosalinda Inguanta, Myeongsub Kim
Nucleate boiling is perhaps one of the most efficient cooling methodologies due to its large heat flux with a relatively low superheat. Nucleate boiling often occurs on surfaces oriented at different angles; therefore, understanding the behavior of bubble growth on various surface orientations is of importance. Despite significant advancement, numerous questions remain regarding the fundamentals of
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Dynamics and deposition of nanoparticles for evaporating microdroplets in pixel pits Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Wenxiang Wu, Jiankui Chen, Wei Chen, Ziwei Zhao, Qilong Wu, Zhouping Yin
Inkjet printing is already regarded as a transformative technique for producing organic light-emitting diodes (OLED) due to its low cost, high material utilization, and short procedure. However, the application of printed OLED has been severely limited by the appearance fault of cured microdroplets. The process of microdroplets evaporation is complicated and hard to monitor experimentally since it
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An efficient thermo-hydraulic model for the investigation of a plate-fin heat exchanger in a single mixed refrigerant process Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Mehdi Falsafi, Ali Vatani, Mojgan Abbasi, Ali Palizdar
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Experimental and numerical simulation study of a novel double shell-passes multi-layer helically coiled tubes heat exchanger Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Yuyang Yuan, Jiaming Cao, Zhao Zhang, Zhengyan Xiao, Xuesheng Wang
To enhance the heat transfer efficiency of the helically coiled tubes heat exchangers, this paper proposes a double shell-passes structure designed for a multi-layer helically coiled tubes heat exchanger. Numerical simulation is employed to investigate the performance of the Double Shell-passes Multi-layer Helically Coiled Tubes Heat Exchanger (DSMHCTHE). Furthermore, an experimental test system is
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Heat transfer enhancement in vertical convection under spatially harmonic temperature modulation Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-09 Kai Leong Chong, Songniu Qiao, Jian-Zhao Wu, Bo-Fu Wang
In this study, we investigate the impact of spatial temperature modulation on vertical convection (VC) and analyze how the efficiency of heat transfer varies with modulation parameters. Our analysis focuses on the behavior of VC under sinusoidal temperature variations imposed on the hot wall, while maintaining a fixed temperature at the cold wall. The simulations are carried out in both two dimensions
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Local thermal non-equilibrium effects on phase transition of fiber reinforced thermoplastic composites with temperature-dependent heat generation Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-08 Yuhang Yuan, Zhenghua Rao, Tian Zhou, Shengming Liao
Under the excitation of external fields, fiber reinforced thermoplastic (FRTP) composites can be thermally processed due to the internal heat generation, in which the local thermal non-equilibrium (LTNE) can be significant during the phase transition. In this study, a representative elementary volume scale Lattice Boltzmann model was developed to simulate the phase transition process of FRTP composites
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Vertical length effect on dropwise condensation heat transfer at low heat flux - Part II: Theoretical model suitable for non-coated metal surfaces Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-08 Taeseok Kim, Sung Joong Kim
Rivulet flows can form and thereby affect heat transfer during dropwise condensation on long vertical surfaces. Under noncondensable gas conditions, including in heat exchangers in small modular reactors, droplet/rivulet heat transfer becomes more complicated. A new dropwise condensation heat transfer model is proposed herein to incorporate vertical length effects in the presence of noncondensable
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An experimental study of the effects of porosity and ratio of fin to channel width on water flow boiling in copper foam fin microchannels Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-07 Kai Fu, Xianghua Xu, Xingang Liang
Flow boiling in copper foam fin microchannels (FFMC) has demonstrated better heat transfer performance and flow stability. In this work, systematic experiments are conducted to investigate the effects of structural parameters on flow boiling in five FFMCs with porosities ranging from 0.78 to 0.82 and ratios of fin width to channel width ranging from 0.5 to 2. Five mass fluxes ranging from 68 kg/(ms)
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Validation of two-group interfacial area transport equation in boiling flow Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-06 Joseph L. Bottini, Taiyang Zhang, Caleb S. Brooks
The Two-Fluid Model is the backbone of thermal-hydraulics and system-analysis codes for nuclear design. The Two-Fluid Model tracks the transfer of conserved quantities—mass, momentum, and energy—without the need for bubble interface tracking. However, two-phase flows are characterized by their different flow regimes which change as more vapor is present in the flow, from bubbly flow to cap/slug flow
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Thermal performance of polymer gyroid heat exchangers combined with phase change materials as a latent heat thermal energy storage system: An experimental investigation Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-05 Duc Vu Ly, Yuga Kishi, Tadachika Nakayama, Noboru Yamada
Latent heat thermal energy storage (LHTES) systems utilizing phase-change materials (PCMs) in conjunction with heat exchangers (HXs) have been widely investigated for efficient thermal energy utilization. This study experimentally evaluated the heat transfer performance and pressure loss of a PCM-based gyroid HX fabricated using a polymer 3D printer. Initially, the study compared the phase change time
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Prediction of entrainment fraction in two-phase gas-liquid co-current annular flow-A machine learning approach Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-05 Anadi Mondal, Subash L Sharma
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Microwave heating of oil shale based on multiphysics field coupling: Positioning of the waveguide Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-05 L. Zhao, X. Ming, G. Duan
Microwave heating has proven widespread applications in oil shale pyrolysis; however, the impact of waveguide port positioning on the microwave reactor's thermal performance remains underexplored. This work establishes a 3D coupled model that incorporates electromagnetic, thermochemical, and fluid dynamics effects employing multiphysics modeling methodology. The thermochemical characteristics of an
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Thermal bridging effect enhancing heat transport across graphene interfaces with pinhole defects Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Weidong Zheng, Yinong Liu, Chunwei Zhang, Hongkun Li, Cheng Shao
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Experimental investigation of the effect of droplet size on the vaporization of butanol in turbulent environments at elevated pressure Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Arash Arabkhalaj, Cameron Verwey, Madjid Birouk
This paper presents an experimental study of the effect of droplet size on the vaporization rate of butanol fuel under turbulent flow conditions at elevated pressure and room temperature. The butanol droplet is suspended at the intersection of two micro-fibers in the center of a spherical vessel. The initial size of the butanol droplet is varied in the range between 300 and 700 μm. A controlled turbulent
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Influence of Subcooling and pressure on flow boiling in a vertical mini-channel: Heat transfer analysis using inverse method Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Robin Lioger--Arago, Pierre Coste, Nadia Caney
The background of this study is the problem of thermal runaway in the battery cells of electric vehicles. Increasingly powerful and compact battery packs require highly efficient thermal management. One potential solution is the direct liquid cooling of lithium-ion battery cells using a dielectric liquid which boils over a safety limit temperature. This approach intends to prevent in a first step the
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The effect of heat flux on enhancement heat transfer mechanism in copper metal foam composite paraffin wax during melting process: Experimental and simulation research Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Zilong Wang, Jintao Gui, Liucan Zhu, Hua Zhang, Binlin Dou, Guoxin Yu, Mengjie Song, Lianyong Jiang, Xin Xiao
To investigate the effect of heat flux on the enhanced heat transfer in phase change materials (PCMs) composed of copper metal foam (CMF) and paraffin wax (PX), a semi-cylindrical visualized heat storage device with a varied heat flux of 7.3 kW/m, 8.5 kW/m, 9.7 kW/m, and 10.9 kW/m was established in this paper. Moreover, a 3-D mathematical model of composite phase change materials (CPCMs) was established
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Cryogenic thermal conductivity of carbon fiber reinforced polymer composite laminates Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Yuanchen Li, Zhanzhi Zhang, Shengbao Wu, Zeang Zhao, Hongshuai Lei
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Analyses of the thermal and hydraulic characteristics of a perpendicular-flow offset-strip-fin heat exchanger for electric vehicles Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Junhyuk Kim, Yunjae Park, Hongseok Choi, Jinwoo Oh, Hoseong Lee
The heat pump in an electric vehicle (EV) helps to mitigate thermal issues of reduced mileage under cold climate conditions, and improving the performance of heat exchangers can further enhance efficiency. However, the thermal-hydraulic characteristics and performances of such heat exchangers in summer conditions have been often overlooked. In this study, an advanced heat exchanger with a new structure
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A method to partition boiling heat transfer mechanisms using synchronous through-substrate high-speed visual and infrared measurements Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Manohar Bongarala, Justin A. Weibel, Suresh V. Garimella
Heat transfer during boiling involves a variety of transport mechanisms. Available experimental techniques cannot yet fully delineate these mechanisms which has contributed to a long-standing, persistent challenge of constructing accurate mechanistic models for boiling. In this work, we develop a method to identify and distinguish between the individual heat transfer mechanisms that occur during boiling
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The growth of condensed nanodroplets in electric fields: A molecular dynamics study Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Zi-Jie Wang, Shao-Yu Wang, Dan-Qi Wang, Yan-Ru Yang, Xiao-Dong Wang, Duu-Jong Lee
Electric fields (E-Fields) can promote droplet detachment and improve dropwise condensation. Since droplet growth is dominant in the dropwise condensation cycle, the influence of the applied electric field on the growth of condensed droplets is worth exploring. In this work, the effect of molecule orientation polarization in the electric field on the growth of condensed nanodroplets is studied via
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Heat transfer through a three-layer wall considering the contribution of phase change: A novel approach to the modelling of the process Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Dmitrii V. Antonov, Michael I. Nizovtsev, Elena A. Shchepakina, Vladimir A. Sobolev, Pavel A. Strizhak, Sergei S. Sazhin
A novel analytical solution to the time-dependent heat transfer equation for a multi-layer wall considering the contribution of phase change is obtained. Based on this solution a new numerical algorithm is developed for the analysis of variations in temperature and heat flux in a three-layer wall of a building in the presence of transient ambient temperature. In this algorithm, the new analytical solution
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Investigation on the heat transfer and charge/discharge performance of phase change material capsule emulsion based on nanoparticles enhanced thermal conductivity Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Sheng Li, Fan Wu, Jinshuang Gao, Yazhou Zhao, Xuejun Zhang
Both internal encapsulation and external added nanoparticles have been employed in this study to enhance thermal conductivity and explore the corresponding heat transfer characteristics. Specifically, the correlation between thermal conductivity and capsule, nanoparticle content, as well as the enhanced heat transfer/thermal energy storage performance facilitated by internal encapsulation are demonstrated
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Analysis methodology during heat transfer in fluid domain: Conduction-advection thermal resistance in parallel Int. J. Heat Mass Transf. (IF 5.2) Pub Date : 2024-04-04 Qiuwang Wang, Xiangxuan Li, Jiaqing Zhang, Ting Wang, Shihong Ma, Bo Zhang, Ting Ma
Thermo-electric analogy method and thermal resistance are widely used for heat transfer problems to simplify the analysis process of complex heat transfer network. Traditional thermal resistance is usually applicable to one-dimensional steady state heat conduction problem. However, heat convection problem is always involved in engineering applications such as energy power, petrochemical, aerospace