Article
Thermodynamics
Yacheng Wang, Guodong Xia, Ran Li, Qi Li, Ziheng Yan
Summary: This paper investigates the boiling flow characteristics of the dielectric liquid R141b and the enhancement effect of the electric field on the foam metal porous wall microchannel heat sink in the context of heat dissipation problem in linear Fresnel concentrating photovoltaic devices. The effects of electric field strength on wall temperature, heat transfer coefficient, and critical heat flux of the mini-channel heat sink are analyzed, and the behavior of bubbles under the electric field is studied. The experimental results show that the heat transfer coefficient and critical heat flux of the mini-channel heat sink increase with the applied voltage, while the wall temperature decreases.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Zhihan Zhang, Qiang Zhang, Zhaoguang Wang
Summary: This study investigates heat transfer enhancement by flow intermittency in grooved channels and aims to optimize the time domain design of the intermittency pattern. The results show that the optimal thermal performance is achieved when the duration of each intermittency stage matches the characteristic time of flow dynamics. The proposed intermittent pattern increases the averaged surface Nusselt number by 120% with a thermal performance factor of 1.9.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Matthew T. Hughes, Srinivas Garimella
Summary: Enhanced condensation is crucial for improving and miniaturizing power generation and refrigeration systems. This study focuses on developing local design guidelines for condensing flows, comparing the benefits of enhancing low, medium, and high-quality condensation, and analyzing three enhancement techniques. Results show that heat transfer enhancement is achieved when the increase in heat exchanger conductance exceeds the reduction in temperature difference induced by condensation pressure drop.
APPLIED THERMAL ENGINEERING
(2024)
Article
Energy & Fuels
Yue Wang, Jiahao Wang, Xiaomin Liu
Summary: In this study, an innovative method for the topology optimization design of micro-channel structures with different bifurcation angles is adopted. The effect of the target weight coefficient on the structure design of the micro-channel heat sink is investigated. The results show that the heat transfer effect is the best when the bifurcation angle is 135 degrees, and the heat transfer weighting coefficient affects the distribution of solid heat sources in the main channel and the refinement of the branch channels.
Article
Thermodynamics
Qixuan Zhong, Parthiv K. Chandra, Wei Li, Liang Gao, Akhil Garg, Song Lv, K. Tai
Summary: This article focuses on the problem of fluctuating cooling system flow caused by different working states during the operation of electric vehicles. The authors propose a two-dimensional topology optimization method for obtaining cooling plates with different topological structures. The results indicate that the optimized cooling plate structure under low flow conditions has better heat dissipation performance.
APPLIED THERMAL ENGINEERING
(2024)
Article
Mechanics
Van-Nam Hoang, Xuan Wang, H. Nguyen-Xuan
Summary: This paper presents a direct multiscale design approach for 3D porous structures by using adaptive geometric components to describe the macrostructure and microstructure of materials, and utilizing multiresolution topology optimization to reduce the cost of finite element analysis. Optimization of geometry parameters simultaneously optimizes the overall macrostructure and microstructure of materials.
COMPOSITE STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Haowei Hu, Peixue Jiang, Feng Huang, Ruina Xu
Summary: Flow boiling is an important heat dissipation method for cooling high heat flux surfaces, and using porous media surfaces can enhance heat transfer. This study investigates the flow boiling heat transfer characteristics inside micro-porous structures using a pore-scale lab-on-a-chip method. The results show that liquid exists in the pore-throat structures as dispersed liquid bridges and liquid films, and capillary pressure difference between adjacent liquid bridges can drive the liquid film flows to maintain the coolant supply in the two-phase region. Adjusting the pore-throat parameters can enhance heat transfer and reduce pressure drop.
Article
Energy & Fuels
Kai Zhao, Xiaoxia Sun, Yuanqing Xia, Qiangqiang Li, Lili Shen, Min Lin
Summary: Power electronic equipment is facing the challenges of high heat flow density and uneven temperature distribution while aiming for miniaturization and high integration. This paper proposes two types of liquid-cooled flow channel non-linear reinforced heat transfer homogeneous liquid-cooled plates, which achieve the design requirement of uniform temperature on the heating side wall surface through theoretical derivation. The thermal design of the cold plate is carried out using ANSYS Workbench, and the performance of various structures of the cold plate in heat dissipation and temperature uniformity is analyzed and compared.
FRONTIERS IN ENERGY RESEARCH
(2023)
Article
Energy & Fuels
Tao Shi, Huijin Xu
Summary: In this study, a theoretical model was developed for the hydrogen charging process in the hydrogen storage reactor assisted with heat storage, and a novel method to improve heat transfer performance was proposed by topology optimization of thermal conductivity fins. The optimized structure showed significant improvement in the hydrogen charging process.
Article
Thermodynamics
Zhiqi Zhao, Lei Luo, Dandan Qiu, Songtao Wang, Zhongqi Wang, Bengt Ake Sunden
Summary: The study found that in the serpentine channel, having an appropriate gap clearance can enhance the endwall heat transfer and thermal performance while reducing pressure drops, which helps restrain downstream fluid flow and enhance the shear effect of secondary flow.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Chemistry, Multidisciplinary
Lianxiong Chen, Ran Zhang, Xihua Chu, Hui Liu
Summary: This paper proposes a design method for the Voronoi graded stochastic cellular structure (Voronoi-GSCS) that considers the heat transfer problem. The method consists of three steps: offline calculation on the microscale, online optimization on the macroscale, and geometry reconstruction on the full scale. Numerical examples are provided to demonstrate the effectiveness and superiority of the developed method for designing the Voronoi-GSCS. Size effect analysis is conducted to investigate the influence of microstructure size on the Voronoi-GSCS. It is emphasized that the smallest struts are larger than the minimum print size of additive manufacturing, making the Voronoi-GSCS convenient for heat transfer applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Thermodynamics
Q. Y. Yao, C. Y. Zhao, Y. Zhao, H. Wang, W. Li
Summary: In this paper, the flow channel layout in a latent heat storage unit was optimized through topology optimization with a focus on balancing heat transfer effects and flow resistance. Results showed that as heat transfer weighting increased, channel structures became more complex, leading to improved heat transfer performance at the expense of increased pressure drop.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Engineering, Environmental
Yuqing Zhou, Danny J. Lohan, Feng Zhou, Tsuyoshi Nomura, Ercan M. Dede
Summary: In this paper, an inverse design and dehomogenization framework is proposed to discover innovative microreactor flow field designs. Through numerical simulations, trade-offs between reaction performance and fluid flow performance are found for multiple optimized microreactor flow fields. Applying the findings of this study to new reactor flow field designs can enhance performance in biomedical, pharmaceutical, and energy applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Thermodynamics
Kihoon Lim, Keunhee Lee, Hyungson Ki, Jaeseon Lee
Summary: This study proposes a new method using a femtosecond laser to enhance flow boiling heat transfer in mini/micro-channel ducts. The experimental results demonstrate that surfaces with nanosized clustered cavities and hydrophilic characteristics have the most significant enhancement in flow boiling heat transfer and critical heat flux.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Computer Science, Interdisciplinary Applications
Brice Rogie, Casper Schousboe Andreasen
Summary: This paper demonstrates the advantages of topology optimization of heat sinks, beyond the capabilities of pseudo 3D models. It investigates the use of 3D effects for microchannel heat sinks and compares them to state-of-the-art industrial designs for microelectronic applications. The study shows that the performance of microchannel heat sinks highly depends on complex refrigerant distribution and intricate flow paths, and a 3D topology optimized microchannel heat sink can significantly reduce the temperature elevation of a microelectronic chip.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Thermodynamics
Yunxia Ma, Fei Liu, Honggang Pan, Hongjian Zhang, Shuxia Yan, Ailing Zhang
Summary: This paper proposes a dynamically tunable and switchable perfect infrared absorber that exhibits excellent electrical regulation performance and high absorptance. The absorption mechanism is explained using a multiple interference model, and it is proven to be polarization insensitive.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
F. J. dos Santos, G. S. M. Martins, M. Strobel, L. Beckedorff, K. V. de Paiva, J. L. G. Oliveira
Summary: This study investigates the effects of inlet conditions and plate's features on the thermal-flow performance of a gasket plate heat exchanger (GPHE) and assesses the impact of a modified tightening distance on its performance. No systematic study on the combined effects of inlet conditions and assembly accuracy on GPHE performance has been conducted before.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Alok K. Ray, Dibakar Rakshit, K. Ravi Kumar, Hal Gurgenci
Summary: The low thermal conductivity of phase change materials limits the heat transfer rate and application of latent heat storage systems. This numerical study examines the impact of two passive heat transfer enhancement techniques on the thermal performance of a latent heat storage system. The results show that the orientation and position of the heat transfer fluid tube have significant effects on the charging duration, while the discharging duration remains unchanged. The combined effect of orientation and eccentricity reduces the charging duration, but increases the discharging duration compared to the concentric domain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yalu Han, Yanlong Wang, Chenyang Liu, Xinmin Hu, Yin An, Zhengcai Li, Jiaxun Jiang, Lizhi Du
Summary: This paper investigates the calculation method of thermal conductivity in NAPLs-contaminated soils. By establishing NAPLs-contaminated soil models and using the Lattice Boltzmann Method (LBM) for calculation, an optimized three-dimensional model with high computational accuracy and efficiency is obtained. The study also finds that saturation and Nz parameters have a significant impact on calculation time, while the thermal conductivity of the two-dimensional model is more sensitive to anisotropy. The influence of porosity and NAPLs content on thermal conductivity should be considered during in-situ thermal desorption.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Mostafa Taha, Song Zhao, Aymeric Lamorlette, Jean-Louis Consalvi, Pierre Boivin
Summary: For the first time, large-eddy simulations (LES) of the near-field region of large-scale fire plumes were performed using a pressure-based Lattice Boltzmann method (LBM) with low-Mach number approximation. The simulations showed quantitative agreement with experimental data and were consistent with previously-published numerical studies. The study demonstrated the computational efficiency of the proposed LBM solver in tackling fire-induced flows, suggesting LBMs as a good alternative candidate for modeling fire-related problems.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weixin Zhang, Yehang Xie, Yuqiang Ding, Zhao Liu, Zhenping Feng
Summary: This study investigated the impact of upstream slot leakage on the endwall film cooling characteristics of turbine blades. Pressure Sensitive Paint (PSP) technology was used to measure the film cooling characteristics, and numerical analysis was conducted to evaluate the aerodynamic performance. It was found that increasing the mass flow ratio of the upstream slot enhanced film cooling, decreased aerodynamic losses, and reduced the strength of passage vortex. However, reducing the distance between the slot and the blade leading edge only enhanced film cooling without affecting the leakage coverage area.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rui Zhang, Zhen-lei Li, Yan-sheng Zhang, Dong Chen, Guo Yuan
Summary: This study discusses the heat transfer behavior of different jet forms on steel tubes. The results show that the annular jet performs better in terms of cooling intensity and uniformity. The cooling performances of the two jet forms are similar when the steel tube size is small. Therefore, the planar jet can be considered for smaller diameters due to its simplicity, low cost, and convenience in application.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
A. R. Khoei, A. M. Orvati Movaffagh, A. Rezaei Sameti
Summary: This paper presents a comprehensive study on the thermo-mechanical characteristics of oxide-coated aluminum nano-powder. It is found that the thermal conductivity of oxide-coated aluminum nano-powder is significantly lower than that of the bulk aluminum, and it is affected by the density and temperature.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Yanjin Wang, Jintao Xiong, Lingyu Chen, Zhihai Lv, Qian Wang
Summary: A solar radiation transfer model for spray cooling double skin facade (SC-DSF) is proposed in this study. The model is validated by experimental results and various influence factors are analyzed. The effectiveness of adjusting droplet coverage rate and size is also evaluated.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Bostjan Zajec, Blaz Mikuz, Anil Kumar Basavaraj, Marko Matkovic, Matej Tekavcic, Martin Draksler, Leon Cizelj, Bostjan Koncar
Summary: We have developed an advanced experimental setup to investigate flow and heat transfer in an annular channel. The setup allows heat transfer measurements and flow visualization using a temperature-controlled inner tube. Measurements can be conducted in both single-phase and two-phase flow regimes. The setup ensures a uniform velocity field in the annular channel using specially designed inlet and outlet headers. The inner copper tube is heated by water and contains turbulators for enhanced heat transfer and thermocouples for temperature measurement. A three-dimensional conjugate heat transfer CFD model has been developed and validated to accurately estimate heat losses in the setup. This study demonstrates the importance of numerical simulations in improving the interpretation of complex experimental results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Weijie Chen, Ke Wang, Yongqing Wang, Shantung Tu, Zunchao Liu, Huijuan Su
Summary: In this study, a novel gradient porosity transpiration cooling plate structure (GP-TCPS) is proposed to alleviate heat transfer deterioration caused by non-uniform temperature distribution in transpiration cooling plate structure (TCPS). Computational fluid dynamics (CFD) and response surface method (RSM) were used for qualitative and quantitative analysis of the flow and heat transfer of GP-TCPS. The optimized structure of GP-TCPS significantly improves temperature uniformity, injection pressure, and average cooling efficiency compared to traditional TCPS.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
R. Essam, A. Elsaid, W. K. Zahra
Summary: This study presents a novel bioheat model for simulating heat transfer in skin tissue. The model offers an improved representation of thermal dynamics in the skin and has been validated using numerical solutions and experimental measurements. The study highlights the importance of incorporating vascular inlet parameters and thermal relaxation effects in the thermal profile, and suggests potential applications in thermal therapy and wound healing.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Dongbo Shi, Tao Xu, Zifeng Chen, Di Zhang, Yonghui Xie
Summary: The cooling structure design of turbine blades is crucial for the safety and reliability of the gas turbine set. This research investigates different arrangement schemes, including dimple/protrusion arrangements, to enhance the cooling performance. The results show that the arrangement scheme with both passes arranged by dimples has the best comprehensive thermal performance.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Emrehan Guersoy, Hayati Kadir Pazarlioglu, Mehmet Guerdal, Engin Gedik, Kamil Arslan
Summary: The thermo-hydraulic performance of Al2O3/H2O nanofluid with different nanoparticle shapes flowing in a sudden expansion tube with variable sudden expansion inclination angles and elliptical dimpled fins with different diameters were numerically investigated. The results showed that the nanoparticle shapes, sudden expansion inclination angles, and elliptical dimpled fin have significant impact on the thermo-hydraulic performance. This study reveals the novelty and importance of these factors in the research.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Rukun Hu, Xinyu Huang, Xinyu Gao, Liu Lu, Xiaohu Yang, Bengt Sund
Summary: This study examines the impact of applying bottom cross-cut on PCM's spatial distribution in a horizontal LHTES unit using numerical simulation. The findings show that bottom cross-cut can improve the heat storage rate and natural convection heat transfer gain.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)