Article
Thermodynamics
Chun-Sheng Wang, Po-Yi Shen, Tong-Miin Liou
Summary: A new thermal lattice Boltzmann model (TLBM) was developed to simulate conjugate heat transfer in a microchannel heat sink (MCHS) with porous ribs and pulsatile flow. The study revealed that flow pulsation can improve temperature distribution and enhance heat transfer efficiency in the heat sink.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Jian Song, Fei Liu, Yi Sui, Dalei Jing
Summary: This study numerically investigates the hydraulic and thermal performances of trapezoidal microchannel heat sinks, revealing that pressure drop increases with decreasing small-to-large end width ratio. Only TMCHS configurations with PCPFLI and RCCFLI show improved thermal performances as the ratio decreases, with lower thermal resistance and more uniform temperature distribution. The TMCHS with RCCFLI configuration exhibits the best overall thermal performance among the six configurations studied.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Qifeng Zhu, Ruirui Su, Huixue Xia, Jingwei Zeng, Junjie Chen
Summary: Microchannel heat sinks with a combination of water droplet cavities and rib columns show improved overall performance in heat dissipation. The shape and geometric parameters of rib columns significantly affect hydrothermal performance. Among all cases, microchannels with water droplet cavities and elliptical rib columns exhibit the best overall performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Aparesh Datta, Santosh Sah, Arindam Majumder, Nirmalendu Biswas, Dipankar Sanyal
Summary: This study discusses the potential of the IMCHS-CR design in improving thermal performance and demonstrates the effectiveness of the design through numerical solutions and optimization methods. The results indicate a significant impact of controlling the relative discharges and passes through the rib pair on thermal performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Energy & Fuels
Sadiq Ali, Faraz Ahmad, Kareem Akhtar, Numan Habib, Muhammad Aamir, Khaled Giasin, Ana Vafadar, Danil Yurievich Pimenov
Summary: The study found that adding trefoil ribs to any wall improves heat transfer characteristics but increases friction factor. Pressure drop and heat transfer coefficient show similar trends, with highest values for MC-AWTR, followed by MC-SWTR, and lowest for MC-BWTR. The thermal enhancement factor is highest for MC-SWTR, followed by MC-BWTR, and lowest for MC-AWTR, with an increase with Reynolds number in each case.
Article
Thermodynamics
H. C. Cui, X. T. Lai, J. F. Wu, M. Z. Wang, W. Liu, Z. C. Liu
Summary: Two submerged jet impingement/microchannel heat sink (JIMHS) models, SJIMHS and OJIMHS, were proposed and their heat transfer and flow characteristics were investigated through numerical simulation and experiment. The results show that OJIMHS has a more uniform and lower temperature distribution on its heat transfer surface compared to SJIMHS, with an average convective heat transfer coefficient about 20% higher.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Materials Science, Multidisciplinary
Jin Yuan, Yongfeng Qu, Ningkang Deng, Liang Du, Wenbo Hu, Xiaofan Zhang, Shengli Wu, Hongxing Wang
Summary: Four types of novel single crystal diamond straight microchannel heat sinks are designed and investigated, and compared with a conventional rectangular micro-channel heat sink. The results show that the novel heat sinks can enhance heat dissipation, with the V-shaped and X-shaped heat sinks having higher heat transfer capabilities and the inclined heat sink having lower pumping power. The X-shaped heat sink is found to be the most optimal in terms of performance evaluation.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Thermodynamics
Rui Zheng, Yongjin Wu, Yahui Li, Guilian Wang, Guifu Ding, Yunna Sun
Summary: The study introduced a hierarchical microchannel heat sink for heat transfer enhancement. Through simulation and experimentation, it demonstrated superior performance and potential in heat dissipation compared to traditional heat sinks.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Po Liu, Wei Chen
Summary: This study investigates the heat transfer characteristics of wavy flowing channels with microencapsulated phase change material (MPCM) slurry as coolant. The results show that compared to traditional water cooling systems, channels with MPCM slurry coolant exhibit better thermal-hydraulic performance. The optimization of porous layer thickness and MPCM concentration can further enhance the performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Xue-shuo Shang, Qing-wen Li, Qun Cao, Zi-rui Li, Wei Shao, Zheng Cui
Summary: This study develops a mathematical model of a rectangular microchannel heat sink (MCHS) and derives the thermal resistance using structural parameters based on the differential equation of energy conservation. Both experimental and numerical methods are employed to validate the model. A multiobjective optimization model is also established to simultaneously minimize the thermal resistance and the pumping power. The mathematical model and the multiobjective optimization method are beneficial for the design of an MCHS owing to the high convenience and reliability.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Chemistry, Analytical
Nikita Kumari, Tabish Alam, Masood Ashraf Ali, Anil Singh Yadav, Naveen Kumar Gupta, Md Irfanul Haque Siddiqui, Dan Dobrota, Ionela Magdalena Rotaru, Abhishek Sharma
Summary: This study investigates a novel design of microchannel heat sink (MCHS) and explores the impact of different surface modifications on heat transfer performance. The results demonstrate that geometric modifications significantly enhance the cooling capacity, highlighting the importance of effective thermal management for electronic devices.
Article
Thermodynamics
Somayeh Davoodabadi Farahani, Amir Davoodabadi Farahani, Ebrahim Hajian
Summary: This study aims to enhance the thermal behavior and hydraulic performance of a conventional microchannel heat sink (MCHS) through the use of porous material, phase change material (PCM), and nanofluid. The findings show that for a critical thickness of the porous substrate, the thermal performance reaches a minimum point. Increasing values of Darcy number, porosity coefficient, nanoparticle diameter, and PCM thickness lead to a decrease in the thermal performance of MCHS. A square geometry MCHS demonstrates superior thermal performance compared to other geometries, and the use of porous material, nanofluid, and PCM results in improved thermal behavior compared to a conventional microchannel.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Pingnan Huang, Shu Yang, Minqiang Pan
Summary: This paper investigates the application of pseudo 3D variable-density topology optimization to the design of microchannel heat sink. The study introduces outside surface viscous dissipation, adaptive equivalent heat transfer coefficient, and auxiliary objective to improve the accuracy of the model. The results show that the proposed topological model effectively mitigates intermediate density, improves accuracy, and produces a well-defined structure.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
K. Derakhshanpour, R. Kamali, M. Eslami
Summary: The study conducted 3-Dimensional numerical simulations to analyze laminar fluid flow and forced convection heat transfer through novel designs of microchannel heat sinks with cylindrical ribs. Incorporation of cylindrical ribs significantly enhanced heat transfer coefficient and reducing rib pitch had a greater effect on improving hydrothermal performance. Additionally, double-layered microchannels showed higher convection heat transfer coefficient and double-layered-design 1 microchannels performed the best with increased mass flow rate.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Zengkun Zhan, Lixia Chen, Hongna Zhang, Chuandong Lin, Sining Li, Xiaobin Li, Fengchen Li
Summary: This research proposes a new technique for heat transfer enhancement using viscoelastic fluid pulsating laminar flow (VPL flow). Numerical studies and flow performance analysis show that VPL flow significantly improves the overall heat transfer performance, with optimal enhancement achieved at pulsation frequencies close to the characteristic frequency of the viscoelastic fluid flow.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)