Article
Thermodynamics
Yongtong Li, Liang Gong, Bin Ding, Minghai Xu, Yogendra Joshi
Summary: This paper presents a study on the performance of liquid cooled aluminum foam heat sinks using experimental and numerical methods. It is found that the permeability decreases and inertial coefficient increases with increasing pore density. The AF heat sink demonstrates significantly better thermal performance compared to an empty channel, and the enhancement by 20 PPI foam is negligible. The LTNE model provides more accurate predictions of temperature distributions than the LTE model.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Xianke Lu, Yubao Zhang, Shengjie Xiao, Yu Zhao, Jiansheng Li, Jun Zhou, Qiubao Ouyang
Summary: This study experimentally investigated the effects of porosity, pore diameter, and heating direction on the heat transfer performance of copper foam under natural convection. The open-cell copper foam with controllable porosity and different pore sizes was fabricated, and the natural convective heat transfer coefficient was measured. The results showed that porosity had a significant effect on heat transfer performance when it exceeded 75%, with an optimal pore size of 850 μm. Samples heated from the side exhibited better heat transfer performance compared to those heated from the bottom. Changes in thermal conductivity and permeability were the main factors influencing the natural convective heat transfer performance due to variations in porosity and pore size.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Kihoon Lim, Jaeseon Lee
Summary: This study experimentally implemented a counterflow heat sink for the first time through the design of a new internal flow distribution structure, and proposed a new correlation to predict the heat transfer coefficient affected by the counterflow. The results showed significantly improved cooling performance compared to conventional heatsinks, indicating the potential for practical applications of counterflow heat sinks.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Oguzhan Ozbalci, Ayla Dogan, Meltem Asilturk
Summary: Solving the heating problem of electronic systems is a common research topic today. This study investigated the effects of using metal foam heat sinks with different pore densities instead of conventional finned surfaces, and found that it can improve the thermal and pressure performance. By using nanofluid together with metal foam heat sinks, a significant improvement in heat transfer coefficient was achieved.
APPLIED THERMAL ENGINEERING
(2023)
Article
Mechanics
Kangyuan Liu, Xin Li, Jiabing Wang, Kun Yang
Summary: This paper investigates the characteristics of the stress jump coefficient by constructing the real pore structure of metal foam using the Weaire-Phelan model and simulating a complex three-dimensional porous composite system. A novel method to determine the stress jump coefficient is proposed. The results show that the stress jump coefficient varies with the porosity and is independent of the inlet velocity, the rotation number, and the flow pattern.
Article
Thermodynamics
Amitav Tikadar, Satish Kumar
Summary: This paper proposes three novel water-cooled aluminum metal foam integrated compound heat sink layouts to mitigate localized hotspots resulting from non-uniform heat generation. Computational fluid dynamics/heat transfer simulations have been performed to compare the effectiveness of the proposed layouts with conventional heat sink. The results show that the solid fin-MF layout offers the best thermal-hydraulic performance and temperature uniformity, especially at higher coolant flow rates.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Y. Dharmendar Reddy, B. Shankar Goud, Kottakkaran Sooppy Nisar, B. Alshahrani, Mona Mahmoud, Choonkil Park
Summary: This study numerically investigates the magnetohydrodynamic (MHD) heat transfer properties of an incompressible viscous fluid across a continuously expanding horizontal cylinder immersed in a porous material with internal heat production/sink. The governing partial differential equations are transformed into a collection of non-linear ordinary differential equations (ODEs) using similarity variables and numerically solved using the Keller-Box approach. The fluid velocity, temperature, friction factor, and rate of heat transfer are calculated. Graphs and tables illustrate the fluid velocity and heat transfer properties for various Prandtl numbers and magnetic parameters. The study aims to examine the effects of the magnetic field (M), Prandtl number (Pr), and heat absorption/generation factor (Q) on the velocity and temperature gradients along a stretching cylinder. It is projected that an increase in the curvature parameter and porosity factor enhances the temperature gradient in the boundary layer region around the cylinder.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Ganesh Ravi Shanker, K. O. Homan
Summary: In this study, multi-dimensional natural convection and mixed convection in a vertical borehole of a ground source heat pump were numerically investigated. It was found that natural convection has a significant impact on heat transfer, while mixed convection induced by groundwater flow depends on the Peclet number. The multi-dimensional mixed convection was shown to be captured between natural and forced convection, with a dimensionless group identified to parameterize the transition between the two limits.
Article
Mechanics
Km Renu, Ashok Kumar, Abhishek K. Sharma
Summary: The study investigated the stably stratified flow in a linearly heated vertical pipe filled with a fluid-saturated porous medium, with a focus on the impact of permeability and Prandtl number on the stability of basic flow at different disturbance modes. The results demonstrate that the least stable mode depends on the values of Pr and Da, with a small range of Pr exhibiting a change in destabilizing characteristics to stabilizing characteristics for certain Da values.
Article
Computer Science, Information Systems
Oguzhan Ozbalci, Ayla Dogan, Meltem Asilturk
Summary: With the advancement of technology, electronic systems are shrinking in size while their performance and energy requirements are increasing. This study found that using PHS and nanofluid as cooling agents can significantly enhance heat transfer efficiency and reduce surface temperatures.
Article
Green & Sustainable Science & Technology
Hafiz Muhammad Ali
Summary: The operation of electronic devices generates a significant amount of heat, making thermal management critical for their safe and reliable operation. In this experimental research, different configurations of phase change material (PCM) based heat sink were analyzed for thermal management of electronic devices, particularly computer chips. The results showed that using nickel foam impregnated with PCM reduced the base temperature by up to 25% compared to sinks without PCM. Additionally, the integration of PCM volume fraction 0.8 with nickel foam increased the operation time of the heat sink by 4 times.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Mechanics
M. Ajithkumar, P. Lakshminarayana, K. Vajravelu
Summary: The study focuses on analyzing the impact of Hall current, thermal radiation, and cross-diffusion on peristaltic pumping of a specific type of nanofluid in a porous medium. The research investigates the behavior of velocity, temperature, heat transfer coefficient, concentration, skin friction coefficient, and trapping. The findings are compared with existing studies and validated using numerical solutions.
Article
Thermodynamics
Mostafa Fathi, Mohammad Mahdi Heyhat, Mohammad Zabetian Targhi, Sajjad Bigham
Summary: Porous-fin microchannel heat sinks have the potential to improve the thermal and hydraulic performances of microelectronic cooling systems. However, the reduced effective thermal conductivity of porous fins compared to solid fins can negatively impact the thermal performance of the microchannel heat sinks. This research confirms that replacing solid with porous fins can simultaneously enhance the thermal and hydraulic performances of microchannel heat sinks.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
A. A. Avramenko, I. Shevchuk, A. Tyrinov
Summary: This paper analyzes the convective instability in a vertical cylindrical porous microchannel using the Galerkin method, revealing that a decrease in permeability of the porous medium increases flow stability, while an increase in slippage effects leads to higher instability in the system.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Mathematics
Ruben D'Rose, Mark Willemsz, David Smeulders
Summary: This study presents and discusses several methods for analyzing convective heat transfer in a porous medium. The Fourier method, integration method, and finite difference method were used to obtain temperature solutions. The results were compared to a numerical model, showing good agreement between them.
Article
Engineering, Electrical & Electronic
Yongtong Li, Liang Gong, Minghai Xu, Yogendra Joshi
Summary: This paper introduces a concept of metal foam heat sink with pin fins (MFPF heat sink) to improve the cooling performance of high-powered electronics with nonuniform heat flux. Numerical simulations show that the MFPF heat sink greatly enhances heat transfer performance due to improved flow distribution and enhanced overall effective thermal conductivity (ETC), leading to lower junction temperatures below 95 degrees C.
JOURNAL OF ELECTRONIC PACKAGING
(2021)
Article
Thermodynamics
Chuan-Yong Zhu, Ze-Kai Gu, Hai-Bo Xu, Bin Ding, Liang Gong, Zeng-Yao Li
Summary: This paper numerically investigates the influences of different parameters on the effective thermal conductivity of fiber-reinforced composites and proposes a correlation for composites with fibers randomly distributed in space. It is found that the most dominant factors affecting effective thermal conductivity are the thermal conductivity of fiber and coating layers.
Article
Thermodynamics
Liang Gong, Yifan Zhang, Zhang Bai
Summary: Geothermal-solar hybrid power generation is a promising technology for renewable energy utilization, aiming to improve energy efficiency and reduce the impact of solar intermittency. A novel hybrid power system with a double-pressure evaporation configuration demonstrates high efficiency and geothermal share under both design and off-design conditions. This research shows the potential of hybrid systems in achieving favorable energy outcomes and reducing solar investment costs.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Ze-Kai Gu, Chuan-Yong Zhu, Zhao-Qin Huang, Ming-Hai Xu, Liang Gong
Summary: The study found that functional groups on the surface of activated carbon increase the adsorption heat and capacity of aromatics at low pressures, while an increase in density decreases the saturation adsorption capacity and pressure. The molecular diameter and mesopore size of aromatics also significantly affect adsorption behavior.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Kaituo Jiao, Dongxu Han, Jingfa Li, Bofeng Bai, Liang Gong, Bo Yu
Summary: This study presents a pore-scale model combining LBM and DEM for accurately calculating fluid flow and temperature in rock fractures, considering anisotropic properties and using the principle of minimum potential energy for particle deformation. The developed THM model provides a comprehensive understanding of fracture propagation mechanisms.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Energy & Fuels
Xu Zhang, Zhaoqin Huang, Qinghua Lei, Jun Yao, Liang Gong, Zhixue Sun, Wendong Yang, Xia Yan, Yang Li
Summary: The study shows that shear dilation of fractures is influenced by pore pressure and thermal stress, resulting in the formation of flow channels and changes in heat transfer performance, thereby affecting heat extraction efficiency. Considering fracture shear dilation and fully-coupled thermo-hydro-mechanical behaviors is crucial when evaluating the long-term performance and efficiency of heat extraction in Enhanced Geothermal Systems (EGSs).
Article
Thermodynamics
Chuan-Yong Zhu, Wen-Xin Yang, Hai-Bo Xu, Bin Ding, Liang Gong, Zeng-Yao Li
Summary: This paper investigates effective thermal conductivity models for particle reinforced composites, proposing a general and easy-to-use model by extending existing ones and validating it.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Nanoscience & Nanotechnology
Chuan-Yong Zhu, Zhi-Yang He, Mu Du, Liang Gong, Xinyu Wang
Summary: The study analyzed the influence of different parameters on the effective thermal conductivity of soils, finding that porosity and water content have a significant impact. While the model with six parameters showed the highest accuracy, the model with only two input parameters (porosity and water content) could still predict the effective thermal conductivity with acceptable accuracy.
Article
Computer Science, Interdisciplinary Applications
Kaituo Jiao, Dongxu Han, Daobing Wang, Yujie Chen, Jingfa Li, Liang Gong, Bofeng Bai, Bo Yu
Summary: Rock damage has a significant influence on the thermal-hydro-mechanical (THM) coupled fracture propagation. A pore-scale THM coupling model is developed to study the synergistic effect of injected temperature difference and rock damage on shale fracture propagation. The model calculates the exchanged THM information and fluid conductivity accurately based on fracture and rock damage. It is found that the generation of branched cracks is closely related to temperature response frontier and the single bond failure increases with higher critical fracture energy (CFE). Hydraulic fracturing is more pronounced in low CFE while thermal fracturing shows the opposite trend. The fluid conductivity of fractured rock increases with higher injected temperature difference, but it weakens when rock damage is significant. Branched cracks propagating to adjacent layers are more difficult to form when the layer has significant rock damage.
COMPUTATIONAL GEOSCIENCES
(2022)
Article
Thermodynamics
Bin Ding, Wen-Chuang Feng, Jian Fang, Shu-Zhe Li, Liang Gong
Summary: This study investigates the quantified contribution of natural convection in phase change material (PCM) heat sinks, and discusses the effects of heat flux and physical parameters on temperature and safe working time. The results show that the cooling performance gradually shifts from heat conduction to natural convection during the temperature fluctuation stage. Natural convection can improve the heat dissipation performance, and correlations are established to predict natural convection under different heat flux conditions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Zhang Dexin, Ding Bin, Zhu Chuanyong, Gong Liang
Summary: A numerical model was established to explore the cooling performance of the outdoor AAU device. The optimization of fin number, height, and other factors effectively reduced the device temperature and improved its cooling performance in outdoor conditions.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Thermodynamics
Xu Zhang, Zhaoqin Huang, Qinghua Lei, Jun Yao, Liang Gong, Wendong Yang
Summary: The geometry connectivity of fracture networks plays a dominant role in determining the thermal-hydro-mechanical (THM) behavior and thermal performance of Enhanced Geothermal Systems (EGSs). Satisfactory thermal performance can be achieved when the connectivity of fracture systems ranges from 15 to 35. By optimizing the fracture networks and designing appropriate production scenarios, the overall heat extraction performance of EGSs can be significantly improved.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Yi-Fan Zhang, Ming-Jia Li, Xiao Ren, Xin-Yue Duan, Chia-Jung Wu, Huan Xi, Yong-Qiang Feng, Liang Gong, Tzu-Chen Hung
Summary: This study investigates the performance of ORC systems under different heat sources through experiments and theoretical analysis. It reveals that the heat source and heat sink significantly affect the system performance. Under similar structure and environmental conditions, larger systems perform better when there is sufficient heating supply, emphasizing the importance of coordination between system capacity, heat source, and heat sink.
Article
Multidisciplinary Sciences
Jian Fang, Wen-Chuang Feng, Bin Ding, Chuan-Yong Zhu, Liang Gong
Summary: The study indicates that using PCM heat sink can effectively reduce the risk of thermal shock to electronic devices and ensure safe operation. Experimental results show that by changing heating positions and adding copper foam, the thermal shock resistance of PCM heat sink can be significantly improved. By using copper foam, the temperature gradient inside paraffin can be smoothed, prolonging the protection time of the heat sink.
CHINESE SCIENCE BULLETIN-CHINESE
(2021)
Article
Thermodynamics
Bin Ding, Zhi-Hao Zhang, Liang Gong, Chuan-Yong Zhu, Ming-Hai Xu
Summary: By using a 3D-IC model with a real microprocessor structure under a liquid cooling condition, the study found that adopting a certain arrangement could balance the maximum temperature and pressure drop effectively.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)
