Article
Thermodynamics
Irina Molotova, Arslan Zabirov, Victor Yagov, Michael Vinogradov, Pavel Kanin, Ivan Molotov, Nikolay Antonov
Summary: This paper presents experimental results on cooling high-temperature steel spheres using subcooled ethanol-water mixtures at atmospheric pressure. The results are consistent with a previously proposed model, which describes the transition from stable film boiling to intensified heat transfer regime.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Mohamed Ouzzane, Mahmoud Bady
Summary: Shallow geothermal energy has gained great interest in recent years due to environmental and economic problems. This study proposes a hybrid system that combines Earth to Air Heat Exchanger (EAHE) with a two pipes heat exchanger to improve cooling efficiency. The simulation results in Madinah city, Saudi Arabia, show promising cooling performance.
APPLIED THERMAL ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Lei Qin, Siheng Lin, Haifei Lin, Shugang Li, Pengxiang Zhao, Weikai Wang, Zitong Xue
Summary: Studying the ice-water phase transition process of frozen coal is key to break through the theory of cryogenic mining technology.
NATURAL RESOURCES RESEARCH
(2022)
Article
Thermodynamics
Yueguang Deng, Manman Zhang, Yi Jiang, Jing Liu
Summary: A two-stage multichannel liquid-metal cooling system for high-heat-flux-density chip arrays is proposed, demonstrating high cooling performance and excellent temperature uniformity, making it a high-performance solution for thermal management in data centers.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Meteorology & Atmospheric Sciences
Kai Yang, Jintao Yang, Pinghan Zhaoye, Feimin Zhang, Guo Zhang, Chenghai Wang
Summary: This study investigates the biases of the Noah-MP land surface model in simulating soil water-heat transport during freeze-thaw processes. The implementation of parameterizations, including a virtual temperature parameterization and a liquid water-dependent soil permeability parameterization, as well as modifications to soil hydraulic and thermal properties, improves the simulation of soil moisture and temperature. These findings highlight the importance of frozen-thawing parameterizations in land surface models and provide a potential way to improve climate simulations in cold regions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Engineering, Environmental
Huong Phan Thu Ngo, Svein-Erik Sveen, Eirik Gjerlow
Summary: Understanding freezing and thawing processes in porous media is crucial for regions experiencing seasonal frost or permafrost. However, thawing of frozen ground has not received as much attention as ground freezing in research studies and field experiments. Accurately predicting thaw depth and rate remains challenging.
JOURNAL OF COLD REGIONS ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Mingkun Yang, Guanqi Li, Yue Gu, Jiaqi Song, Hong Li, Xiuchen Zhao, Yongjun Huo
Summary: This study addresses the challenges of low cooling capacity, short device lifetime, and limited understanding of the impact of thermoelectric component's dimension, structure, and density on their cooling capacity in soft wearable cooling devices. The engineered large-electrode flexible TEC with embedded thermoelectric components and liquid metal traces solves these issues by reducing the amount of liquid metal used, minimizing leakage risks, lowering costs, eliminating environmental pollution, and improving product reliability and manufacturing efficiency. The optimized TEC structure design using finite element analysis provides a generic TEC design kit for considering multiple physical fields and impact factors. The demonstrated TECs offer high cooling capacity and performance stability, surpassing previously reported models in similar materials and structures. The research represents a significant advancement in flexible TECs, with promising applications in wearable devices, electronic skins, and smart textiles.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Chil-Chyuan Kuo, Shao-Xuan Qiu
Summary: The direct metal printing technique for manufacturing injection molds offers potential for creating complex conformal cooling channels using maraging steel powder, commonly used in automotive and aerospace industries. However, the disadvantages of narrow process window and lengthy production time are drawbacks. This study proposes a simple method to reduce coolant leakage in direct-metal-printed injection molds by combining mold fabrication with process parameters and solution and aging treatment (SAT). The study comprehensively examines the microstructural changes in the injection mold after SAT, revealing surface hardness enhancement and pore size reduction. The total production time and cost savings achieved were significant, demonstrating the effectiveness of the proposed method.
Article
Thermodynamics
Patiparn Ninpetch, Pruet Kowitwarangkul, Sitthipong Mahathanabodee, Prasert Chalermkarnnon, Phadungsak Rattanadecho
Summary: This research investigates the thermal behavior and molten metal flow characteristics of the selective laser melting (SLM) process, and analyzes the influence of process parameters on scanning track formation. The results show that laser power and scanning speed have a significant effect on the shape and penetration of the scanning track.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Usman Ikhtiar, Abdul Aziz Bin Hairuddin, Azizan Bin Asarry, Khairil Anas Bin Md Rezali, Hafiz Muhammad Ali
Summary: Intercooler heat exchangers (IHE) are used to improve engine charge air temperature, which enhances engine efficiency and reduces emissions. The current study introduces a novel inter-cooler heat exchanger designed to improve combustion and engine performance by providing cold intake air. Through numerical investigation, it is found that Model D has the highest heat transfer and temperature drop with minimal pressure loss. Due to their compactness, the proposed heat exchanger designs offer higher thermal capacity than other conventional intercooler heat exchangers.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
L. Wang, X. D. Zhang, J. Liu, Y. X. Zhou
Summary: This paper demonstrates a high-efficiency heat dissipation system based on the electromagnetic-driven rotational flow of liquid metal. The velocity distribution, temperature distribution, and system performance were analyzed. The results show that the system can effectively homogenize the temperature and has good heat dissipation effect.
JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS
(2021)
Article
Thermodynamics
Xiu Li, Yimin Xuan
Summary: The proposed self-adaptive cooling technique effectively addresses unevenly distributed high heat fluxes and enhances near-wall flow by adjusting flow distribution. This technology can effectively reduce temperatures and reduce total flow rates by an order of magnitude.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Jiashu Zheng, Xiaoxiang Li, Wenkui Xing, Benwei Fu, Chengyi Song, Wen Shang, Peng Tao, Tao Deng
Summary: This work reports the direct incorporation of high-loading miscible Ga2O3 particles within Ga liquid metals to prepare non-leakage phase change composites for transient heat absorption. The prepared liquid metal composites have high thermal conductivity, low interfacial thermal resistance, small supercooling degree, and large volumetric latent heat, making them suitable for high-performance temporary heat absorption.
APPLIED THERMAL ENGINEERING
(2022)
Article
Automation & Control Systems
Chil-Chyuan Kuo, Shao-Xuan Qiu, Xin-Yi Yang
Summary: Metal additive manufacturing (MAM) has great potential in manufacturing molds with sophisticated conformal cooling channels. A low-cost and highly efficient method has been proposed to reduce coolant leakage in direct metal printed injection molds, improving production efficiency.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Zenghuang Zheng, Song Wei, Yiren Yang, Dan Zhang, Daoguo Yang, Wangyun Li, Jingdong Guo
Summary: Gallium-based liquid metals have advantages as thermal interface materials for high-power electronic devices, but also carry risks for electronic systems. A low-temperature solidifiable liquid-metal composite has been proposed to address this issue, which can transform from liquid to solid at room temperature. The composite demonstrates high thermal conductivity and stable mechanical and thermal properties, making it suitable for electronics' safety and long-life cooling application.
ADVANCED ENGINEERING MATERIALS
(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)