Article
Mechanics
Deming Nie, Geng Guan
Summary: This study numerically investigates the liquid-vapor phase change and boiling heat transfer induced by a microheater in a fluid using a two-phase lattice Boltzmann method. The effects of gravity force, flow strength, and wall wettability are considered. The results show that, for hydrophilic surfaces, flow motion has little effect on the bubble release period, while for hydrophobic surfaces, bubble departure is significantly accelerated by the shear flow.
Article
Mechanics
Ao Xu, Ben-Rui Xu, Li-Sheng Jiang, Heng-Dong Xi
Summary: In this study, we numerically investigate the production and transport of vorticity in two-dimensional Rayleigh-Benard convection. The flow structure and temperature distribution are found to be greatly influenced by the interaction of multiple vortices. Besides vorticity produced by wall shear stress, buoyancy also plays a significant role in generating vorticity in the bulk region. The produced vorticity is then transported through advection and diffusion. The visualization of buoyancy-produced vorticity contours allows for the observation of main and corner vortices. The correlation between the spatial distribution of vorticity flux along the wall and the Nusselt number suggests a direct relationship between the amount of vorticity entering the flow and the amount of thermal energy entering the flow.
Article
Thermodynamics
Saeid Hejri, Emad Hasani Malekshah
Summary: The study investigates the natural convection and entropy production over a fin package filled with copper oxide/water nanofluid, using numerical simulations, to optimize fin geometry and demonstrate that adding nanoparticles to the pure fluid can enhance thermal characteristics over the fins.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Thermodynamics
Mohammad Lakhi, Ali Safavinejad
Summary: In this study, the lattice Boltzmann method was applied to analyze heat transfer in fluid flow between two horizontal plates. The results were validated and the impact of radiation heat transfer parameters was determined. The optical thickness parameter was found to have the most significant influence on radiative heat transfer.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Hee Min Lee, Joon Sang Lee
Summary: In this study, an integrated simulation model was constructed to analyze the effects of particles and heat on the inkjet printing process. The particles caused asymmetric ejection and satellite droplet formation, while heat accelerated the separation of the main droplet, affecting the accuracy of inkjet printing.
APPLIED THERMAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Jing Ma, Yasong Sun, Sida Li
Summary: In this paper, a numerical model is developed using an element differential method to evaluate the heat efficiency of convective-radiative fins in non-Fourier heat conduction. The accuracy and flexibility of this method are validated through numerical examples, and the effects of various factors on fin temperature and efficiency are comprehensively analyzed.
Article
Thermodynamics
Yu Yang, Minglei Shan, Nana Su, Xuefen Kan, Yanqin Shangguan, Qingbang Han
Summary: The thermal lattice Boltzmann method is used to simulate cavitation bubble collapse in heating or cooling systems. The results are consistent with Laplace's law and temperature solutions derived from the Rayleigh-Plesset equation. The effects of wall temperature on a collapsing bubble are studied, and the influence mechanism of the micro-jet and the cavitation bubble itself on solid-wall heat transfer, as well as the thermodynamic behavior characteristics of the cavitation bubble collapse near the wall, are obtained. The study also introduces a dimensionless temperature parameter to analyze the heat transfer intensity of the model.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
procedure Alfredo Jaramillo, Vinicius Pessoa Mapelli, Luben Cabezas-Gomez
Summary: This study proposes a mesh refinement methodology for simulating phase-change heat transfer problems using pseudopotential LBM. The proposed methodology provides convergent results for pool boiling simulations when lattice discretization is refined.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Shuhao Wu, Yongcun Zhang, Shutian Liu
Summary: The overall heat transfer efficiency of transient heat conduction structures can be maximized by minimizing heat compliance. However, in some cases, a new performance index called Transient Thermal Dissipation Efficiency (TTDE) is proposed to better describe the overall heat transfer efficiency. The TTDE-based model shows optimized designs with higher heat transfer efficiency compared to THC-based model, indicating that TTDE is a better objective for topology optimization in such cases.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Fehmi Gamaoun, Amal Abdulrahman, G. Sowmya, Raman Kumar, Umair Khan, Abeer M. Alotaibi, Sayed M. Eldin, R. S. Varun Kumar
Summary: The purpose of this research is to estimate the non-Fourier temperature distribution in dovetail fin using the Cattaneo-Vernotte heat model and the finite difference method. The significant findings of this investigation show that the thermal response in the fin decreases as the scale of the convection and radiation variables rises. The temperature field enhances for Peclet number and ambient temperature parameter, and the temperature drops from the fin's base to its tip for the Fourier effect.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Ziliang Rui, Juan Li, Tianxiang Ding, Jie Ma, Hao Peng
Summary: This study conducted a numerical research of pin fin heat sinks based on phase change materials using the lattice Boltzmann method. It investigated the effects of different geometries and PCMs on the working performance of the heat sinks. Results indicated that the heat sink with 10% CNT compound paraffin and four/five square fins had the shortest charging time, while the heat sink with 8% CNT compound paraffin and four square fins had the highest heat dissipation power.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
S. Mirahsani, A. Ahmadpour, M. R. Hajmohammadi
Summary: This study investigates the enhancement of heat transfer in a channel with the installation of multiple porous obstacles. A partially heated channel is used, and an array of porous blocks is installed on the channel wall as an effective heat transfer enhancement mechanism. The flow and temperature fields are solved using a well-tuned lattice Boltzmann method. The optimal design of the porous obstacles is obtained by considering the blocks' height, pitch, and permeability of the porous medium as design parameters. The impact of the Darcy number on the thermal performance of the porous block is also studied. The PEC number, which considers both pressure drop penalty and heat transfer rate augmentation, is used as a proper thermal performance evaluation criteria. The results show an optimum value for both blocks' height and pitch, depending on the Darcy number. The study also investigates the impact of obstacle geometry and porous material distribution on the thermal performance of the heat-removing system.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Yijie Wei, Xiaochuan Liu, Keyong Zhu, Yong Huang
Summary: A unified lattice Boltzmann framework is proposed for combined radiation-conduction heat transfer problem, and the applicability and accuracy of the framework are validated through numerical cases.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
Xiaofei Ren, Feifei Liu, Zheng Xin
Summary: A modified thermal Bhatnagar-Gross-Krook Lattice Boltzmann (BGK-LB) model is proposed to study the convection phenomenon of non-Newtonian fluids (NNFs). The model incorporates the local shear rate into the equilibrium distribution function and introduces an additional parameter to maintain the relaxation time constant. Numerical simulations demonstrate the accuracy and effectiveness of the model. The study also investigates the natural convection of power-law fluids and analyzes the impact of the power-law index and Rayleigh number on the flow and temperature fields.
Article
Thermodynamics
Zi-Xiang Tong, Ming-Jia Li, Tao Xie, Zhaolin Gu
Summary: This study investigates the application of the lattice Boltzmann method (LBM) in the simulation of conduction-radiation heat transfer in composite materials. New models, D3Q30-LBM and D3Q38-LBM, are proposed for the simulation of the radiative transfer equation (RTE). The results show that the original D3Q26-LBM is not suitable for radiation simulation, while the D3Q30-LBM and D3Q38-LBM are more accurate. However, the LBM can have large errors in heat conduction simulation, limiting its application in composite materials with a large ratio of thermal conductivities. Overall, the LBM models for RTE can be more efficient than the coupled finite volume method (FVM) and discrete ordinate method (DOM) for conduction-radiation heat transfer simulation in composite materials.
JOURNAL OF THERMAL SCIENCE
(2022)
Article
Thermodynamics
Zhuohuan Hu, Rui Li, Xin Yang, Mo Yang, Yuwen Zhang
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2020)
Article
Thermodynamics
Tingting Chen, Yonggao Yin, Yuwen Zhang, Xiaosong Zhang
APPLIED THERMAL ENGINEERING
(2020)
Article
Thermodynamics
Shahabeddin K. Mohammadian, Yuwen Zhang
JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Chemical
Seyed Moein Rassoulinejad-Mousavi, Jafar Azamat, Alireza Khataee, Yuwen Zhang
SEPARATION AND PURIFICATION TECHNOLOGY
(2020)
Article
Energy & Fuels
Zhuohuan Hu, Dongcheng Wang, Wei Lu, Jian Chen, Yuwen Zhang
Summary: A series of inline pico hydropower systems, suitable for confined space and water distribution networks, were designed and investigated. The study utilized numerical simulations and experimental comparisons to find that the standard k-epsilon turbulence model was the most accurate in predicting flow characteristics. The results showed that an opening diameter of 30 mm for the water baffle and a rotor installation angle of 52 degrees achieved the highest efficiency.
FRONTIERS IN ENERGY
(2022)
Article
Green & Sustainable Science & Technology
Jianjun Hu, Meng Guo, Jinyong Guo, Guangqiu Zhang, Yuwen Zhang
Article
Thermodynamics
Yubing Li, Mo Yang, Yuwen Zhang
Summary: Numerical simulations were conducted to investigate the effects of Reynolds numbers on the three-dimensional flow and mass transfer of semi-volatile organic compounds in cylindrical and semi-cylindrical chambers. Asymmetric flow and mass transfer were observed in both chambers when Reynolds numbers exceeded critical values, leading to differences in mass transfer efficiency and convective coefficients. Increasing Reynolds numbers resulted in improved mass transfer efficiency, with Chamber B exhibiting stronger convective mass transfer due to its unique structure.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Yubing Li, Mo Yang, Yuwen Zhang
Summary: By systematically investigating the bifurcation phenomenon and the existence of dual asymmetry solutions of double-diffusive convection in a horizontal cavity, it was found that increasing buoyancy destabilizes the symmetric system, while strong couple diffusion effect delays the onset of bifurcation flow, leading to a pair of asymmetric modes under different initial conditions.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Raihan Tayeb, Yuwen Zhang
Summary: A multiscale simulation method is used to investigate and control the self-assembly of charged polymeric nanoparticles in droplet solution deposited on a substrate. The simulation combines finite volume multiphase VOF method, Dissipative Particle Dynamics, and Level Set parameters to reduce spurious current in the droplet. By analyzing the effects of DLVO forces, van der Waals force, substrate friction, and contact angles, the study provides valuable tools for optimizing nanoparticle self-assembly.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Kun Zhang, Yagang Chen, Liangbi Wang, Yuwen Zhang
Summary: A new implicit finite difference method with a compact correction term is proposed for solving unsteady convection-diffusion equations. It improves the accuracies of numerical solutions by connecting classical and compact finite difference formulas. This method has fourth order accuracy and can be used for both uniform and nonuniform grid systems, as well as for one-dimensional to multi-dimensional and steady to unsteady convection-diffusion equations.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2022)
Article
Mechanics
J. J. Hu, Z. W. Yang, Y. L. Li, Y. L. Jin, Z. Huang, Y. W. Zhang
Summary: This study investigates the dynamic flowfield of close-range impinging jets using time-resolved particle image velocimetry (TR-PIV). The effects of Reynolds number and nozzle end-profile on vortex generation and migration are studied, and the experimental data are analyzed using vorticity analysis and proper orthogonal decomposition (POD) method. The results show that Reynolds number affects vortex generation and migration differently for different nozzle end-profiles, and the energy distribution and variation in the vortices outside the gap are revealed based on the POD analysis.
Article
Thermodynamics
Wenhua Liu, Mo Yang, Yuwen Zhang, Yubing Li, Xuchen Ying, Weijia Huang
Summary: Numerical investigations were conducted on an opposed-fired boiler to understand the formation and effects of asymmetric phenomenon on combustion characteristics. It was found that increased inlet Reynolds numbers led to the evolution from symmetry to asymmetry in the flow and temperature fields under symmetric combustion conditions. Nonlinearity was used to explain this phenomenon and three asymmetric combustion modes were proposed to optimize the flowfield. The final optimal combustion pattern addressed air stoichiometric ratio and reduction zone heights, resulting in improved combustion performance with reduced NOx emissions and carbon content in fly ash.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Raihan Tayeb, Yuwen Zhang
Summary: This paper introduces a machine-learned subgrid-scale modeling technique that efficiently and accurately predicts reactants and products in parallel competitive reactions, particularly in a bubble column. The model is based on data generated from a simplified substitute problem with few features. The machine-learned model corrects errors in concentration and concentration gradients caused by linear interpolation and demonstrates good accuracy on a mesh that covers the concentration boundary layer with minimal computational overhead. Therefore, this model offers significant performance improvements for near spherical, ellipsoid, and dimple-ellipsoidal bubbles.
ASME JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Z. C. Feng, J. K. Chen, Yuwen Zhang
PROCEEDINGS OF THE 15TH IEEE CONFERENCE ON INDUSTRIAL ELECTRONICS AND APPLICATIONS (ICIEA 2020)
(2020)
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)
