International Journal of Thermal Sciences最新文献_第9页

Thermal management and heat transfer enhancement through heatlines visualization in a moving-wall chamber: effects of shear, heater geometry, and nanoparticle suspension 热管理和传热增强通过热线可视化在移动壁室：剪切，加热器几何形状和纳米颗粒悬浮液的影响

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-23 DOI: 10.1016/j.ijthermalsci.2025.110098

Bilal El Hadoui , Youness Ighris , Mourad Kaddiri , Jamal Baliti

{"title":"Thermal management and heat transfer enhancement through heatlines visualization in a moving-wall chamber: effects of shear, heater geometry, and nanoparticle suspension","authors":"Bilal El Hadoui , Youness Ighris , Mourad Kaddiri , Jamal Baliti","doi":"10.1016/j.ijthermalsci.2025.110098","DOIUrl":"10.1016/j.ijthermalsci.2025.110098","url":null,"abstract":"<div><div>The interactions among the shear and floatability forces, geometrical aspects of the heater, and the enhanced properties of nanoparticle suspension are essential in optimizing heat transfer performance within complex chambers, which is beneficial in electronic cooling applications. This study employs the lattice Boltzmann method to investigate mixed convection in a Cu/water nanofluid-filled chamber, where a heater with different lengths is placed on the left sidewall, and the upper wall is subjected to an external moving force. The results are validated experimentally with previous studies. The effective viscosity and conductivity are expressed by means of an experimental model to increase the accuracy of the study. The results, presented through isotherms, streamlines, heatlines, flow intensity, and Nusselt number variations, reveal that heat transfer is maximized when the nanofluid is at the optimum loading of <em>φ</em> = 1.7 %–2 %, reaching up to 5.76 % of enhancement compared to water. The enhanced viscosity and conductivity effect become positive on the heat transfer rate and flow intensity when the speed of the moving wall is high, where it changes from 0.88 % of deterioration to 6.02 % of enhancement for a small heater. Furthermore, the increase in the heater length and temperature difference and the decrease in nanoparticle diameter improve the dynamic and thermal performances, resulting in the maximum enhancement of 11.84 % at <em>Pe</em> = 80 and <em>φ =</em> 2 %. While a higher nanoparticle volume fraction may lead to a decline in heat transfer efficiency, even below that of pure water, depending on other parameters.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110098"},"PeriodicalIF":4.9,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting heat transfer of wedged latticework cooling structure under high thermal load using GA-BP neural network 基于GA-BP神经网络的高热负荷楔格冷却结构传热预测

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-23 DOI: 10.1016/j.ijthermalsci.2025.110100

Binye Yu , Xingwei Li , Jie Li , Shi Bu , Ao Wang , Weigang Xu

{"title":"Predicting heat transfer of wedged latticework cooling structure under high thermal load using GA-BP neural network","authors":"Binye Yu , Xingwei Li , Jie Li , Shi Bu , Ao Wang , Weigang Xu","doi":"10.1016/j.ijthermalsci.2025.110100","DOIUrl":"10.1016/j.ijthermalsci.2025.110100","url":null,"abstract":"<div><div>Wedged latticework is a competitive cooling scheme to resolve the ultra-high thermal load in the trailing edge of modern gas turbine blade. Its performance is closely related to numerous structural parameters, making heat transfer prediction a complicated issue. This paper built a GA-BP neural network for the purpose of fast predicting heat transfer coefficient of wedged latticework cooling channel. Upon analyzing the influence of wedge angle (<em>α</em>), rib-cross angle (<em>β</em>), rib-to-spacing ratio (<em>t</em>/<em>W</em><sub><em>t</em></sub>) and height of channel entrance (<em>H</em><sub>1</sub>) on heat transfer coefficient <em>h</em>, an orthogonal design database is established which is then used as the training set to optimize the BP network based on genetic algorithm (GA). The network is validated by experimental measurement on a wind tunnel test facility. The results indicated that GA-BP network can reach an accuracy of 91.200 %, better than the 87.689 % accuracy of BP network. Furthermore, the proposed GA-BP network owns superior model stability and generalization, making faster heat transfer prediction and more convenient cooling design.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110100"},"PeriodicalIF":4.9,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Transient behavior of fuzzy PID-controlled transpiration cooling with phase change under dynamic thermal environments 动态热环境下模糊pid控制的相变蒸腾冷却瞬态行为

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-23 DOI: 10.1016/j.ijthermalsci.2025.110088

Fei He , Yatong Zhao , Ling Zhao , Xiaorong Wu , Wenjie Dong , Shupeng Xie , Caiyi He

{"title":"Transient behavior of fuzzy PID-controlled transpiration cooling with phase change under dynamic thermal environments","authors":"Fei He , Yatong Zhao , Ling Zhao , Xiaorong Wu , Wenjie Dong , Shupeng Xie , Caiyi He","doi":"10.1016/j.ijthermalsci.2025.110088","DOIUrl":"10.1016/j.ijthermalsci.2025.110088","url":null,"abstract":"<div><div>To ensure the adaptability and dependability of transpiration cooling with phase change under complex dynamic thermal environments, this study establishes a closed-loop control model of fuzzy PID-controlled transpiration cooling with phase change, numerically investigates the transient evolution of liquid-gas two-phase transport and heat transfer within porous structure under coupled control, and systematically evaluates the response characteristics of conventional PID and fuzzy PID control strategies under different sampling intervals, target temperatures, feedback positions, and thermal conditions. The results indicate that, compared to PID control, fuzzy PID control demonstrates enhanced capabilities in mitigating temperature overshoot, shortening adjustment time, and alleviating positive and negative feedback misalignment. The behavior of phase change exerts a considerable influence on the response characteristics of closed-loop control system, and better control can be achieved when the target temperature substantially exceeds the phase transition temperature or the feedback position is located in the superheated vapor region. Furthermore, fuzzy PID control exhibits superior adaptability and robustness under all typical and real thermal conditions. This work provides novel insights for optimizing coolant control systems in transpiration cooling under complex thermal environments.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110088"},"PeriodicalIF":4.9,"publicationDate":"2025-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144337933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of rising motion characteristics of microbubbles in a heated quiescent salt solution 热静盐溶液中微泡上升运动特性分析

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-21 DOI: 10.1016/j.ijthermalsci.2025.110092

Junming Zhang, Xutong Lang, Dong Liu, Xiaxin Cao, Ming Ding

{"title":"Analysis of rising motion characteristics of microbubbles in a heated quiescent salt solution","authors":"Junming Zhang, Xutong Lang, Dong Liu, Xiaxin Cao, Ming Ding","doi":"10.1016/j.ijthermalsci.2025.110092","DOIUrl":"10.1016/j.ijthermalsci.2025.110092","url":null,"abstract":"<div><div>Microbubbles hold promising potential in applications across fields such as wastewater treatment, chemical reactions, and the nuclear industry. In this study, we analyzed the trend of microbubble rising velocity using a high-resolution high-speed camera in a sodium sulfate solution at 60 °C and found that the rising velocity trend is non-monotonic. The efficient mass transfer capability of microbubbles led to diameter reduction during ascent, which in turn influenced the rising velocity. The microbubble rising motion was divided into three stages: initial acceleration, deceleration, and secondary acceleration. Stokes' law and its modified formulas did not fully predict the rising velocity observed experimentally, showing accuracy only at the early stage of the secondary acceleration phase. This study interprets the velocity variation from the perspective of diameter fluctuation during microbubble ascent, elucidating the applicability of Stokes' law for microbubbles in 60 °C saline solution. By performing power correction on Stokes' law, the prediction accuracy was improved, and the velocity data of microbubbles during the secondary acceleration stage fell within the prediction interval with 90 % confidence. Additionally, microbubble collision and aggregation events were observed during the experiments; however, they were rare (less than 0.01 %) and had negligible effects on the statistical data of microbubble motion velocity.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110092"},"PeriodicalIF":4.9,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Molecular dynamics simulations of bubble nucleation characteristics of nano-groove surface 纳米沟槽表面气泡成核特性的分子动力学模拟

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-21 DOI: 10.1016/j.ijthermalsci.2025.110093

Yuting Jia, Yusi Song, Jingtao Wang, Xiaosong Cui, Hongliang Chang

{"title":"Molecular dynamics simulations of bubble nucleation characteristics of nano-groove surface","authors":"Yuting Jia, Yusi Song, Jingtao Wang, Xiaosong Cui, Hongliang Chang","doi":"10.1016/j.ijthermalsci.2025.110093","DOIUrl":"10.1016/j.ijthermalsci.2025.110093","url":null,"abstract":"<div><div>In order to investigate the effect of groove shape on bubble nucleation, the effect of smooth wall, rectangular groove, trapezoidal groove and tenon groove walls on bubble nucleation were investigated by molecular dynamics simulation. The results show that the nucleation time of groove wall surface is earlier than that of smooth wall surface, in which the nucleation time of rectangular groove wall surface is the earliest and the bubble nucleation volume of trapezoidal groove wall surface is the fastest increasing rate. The temperature of argon atoms within the tenon groove rises at the quickest rate,but due to the strong interaction potential energy inside the groove, the nucleation time is significantly later than the other groove walls, and the bubble nuclei are not generated inside the groove, so it is difficult for the argon atoms inside the groove to transform into gaseous argon atoms. In addition, the temperature of argon atoms in the grooves on the wall surface of various grooves is always higher than that in other areas counted, and the temperature of argon atoms in the tenon grooves is higher than that in other grooves, and the temperature of argon atoms in other grooves is almost equal.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110093"},"PeriodicalIF":4.9,"publicationDate":"2025-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation on the cooling performance of lithium-ion battery using liquid cooled-plate with integrated grooves and secondary microchannel structures 采用集成沟槽和二次微通道结构的液冷板对锂离子电池冷却性能进行数值研究

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-20 DOI: 10.1016/j.ijthermalsci.2025.110094

Yiyang Lai , Junling Ding , Lijun Liu

{"title":"Numerical investigation on the cooling performance of lithium-ion battery using liquid cooled-plate with integrated grooves and secondary microchannel structures","authors":"Yiyang Lai , Junling Ding , Lijun Liu","doi":"10.1016/j.ijthermalsci.2025.110094","DOIUrl":"10.1016/j.ijthermalsci.2025.110094","url":null,"abstract":"<div><div>An efficient battery thermal management system serves as a critical safeguard for preserving the operational efficiency, reliability, and safety of lithium-ion battery, especially within elevated thermal environments. This study introduces an innovative liquid cooled-plate design that combines groove and secondary microchannel, and employs three-dimensional numerical simulation techniques to structurally optimize the cooled-plate structure to enhance the thermal regulation efficacy for lithium-ion battery. Initially, by evaluating the performance of various groove configurations, we found that rectangular groove exhibits excellent heat transfer capability. Furthermore, secondary microchannels were integrated between the rectangular grooves to enhance the heat transfer capacity. Numerical results indicate that a microchannel with 0.5 mm width is the optimal choice. Ultimately, the impact of structural optimization on the thermal regulation performance of the system was evaluated. The results illustrate that under the condition of a mass flow rate of 25 g/s, the proposed geometry can increase overall heat transfer performance by 57.1 % and reduce the maximum battery temperature by 0.59 K relative to conventional straight-channel design. This work provides new ideas and perspectives regarding the design of liquid cooled-plate for battery thermal management system.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110094"},"PeriodicalIF":4.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on the characterization of the inclined jet fire constrained by a sidewall under cross-wind conditions 侧风条件下受侧壁约束的倾斜射流火焰特性的实验研究

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-20 DOI: 10.1016/j.ijthermalsci.2025.110085

Hao Zhang , Gaoming Lu , Haiyong Cong , Gang Xu , Zhuyu Shao , Qianqian Xu

{"title":"Experimental study on the characterization of the inclined jet fire constrained by a sidewall under cross-wind conditions","authors":"Hao Zhang , Gaoming Lu , Haiyong Cong , Gang Xu , Zhuyu Shao , Qianqian Xu","doi":"10.1016/j.ijthermalsci.2025.110085","DOIUrl":"10.1016/j.ijthermalsci.2025.110085","url":null,"abstract":"<div><div>Jet fires in the process industry may occur in extreme weather conditions such as typhoons. Extreme weather conditions generate intricate flow fields that not only affect the characteristics of flames but also substantially amplify the risk of jet fires spreading to neighboring equipment. In this work, a set of propane fire experiments was meticulously designed with nozzle wall spacing of 0.03 m, 0.20 m, 0.35 m, and ∞; the coupling effects of cross-wind velocity (0.00–3.12 m/s) and nozzle angle (0–120°) on the flame were also considered. The results show that the presence of sidewalls leads to oscillating tilted jet flames and a reduced wind velocity at the blow-out limit. For horizontal and downward-sloping jet fires, the sidewalls lead to an increase in flame vertical height. In addition, the sidewalls could reduce the flame pulsation frequency. A dimensionless model was developed to predict the vertical height of the jet flame under the influence of the cross-wind coupled with the sidewalls. This work may positively impact the study of the properties of confined jet fire under cross-wind.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110085"},"PeriodicalIF":4.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144330724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of load variation on the performance of pump-driven chip-level two-phase cooling system 负载变化对泵驱动芯片级两相冷却系统性能的影响

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-19 DOI: 10.1016/j.ijthermalsci.2025.110070

Hao Cheng , Tongzhi Yang , Yifan Zhao , Leixin Wang , Kexian Ren , Weixing Yuan

{"title":"Effect of load variation on the performance of pump-driven chip-level two-phase cooling system","authors":"Hao Cheng , Tongzhi Yang , Yifan Zhao , Leixin Wang , Kexian Ren , Weixing Yuan","doi":"10.1016/j.ijthermalsci.2025.110070","DOIUrl":"10.1016/j.ijthermalsci.2025.110070","url":null,"abstract":"<div><div>As a critical component of information infrastructure, data centers' thermal management system efficiency directly impacts equipment operational stability and energy utilization efficiency. This paper innovatively proposes a pump-driven two-phase cooling system oriented toward chip-level thermal control and conducts in-depth experimental research on the influence of dynamic thermal loads on the thermal response characteristics of the cooling system. The experimental results indicate that the cooling system can swiftly achieve a stable transition within 4–5 s during load fluctuations. The study reveals that the heat conduction within the chip and the thermal conduction of the TIM account for 71.6 % of the chip's heat transfer thermal resistance. Under extreme test conditions, the maximum temperature difference between chip cores can reach 16 °C. In addition, by increasing the operating temperature of the cooling system, the heat transfer temperature difference of the cooling system can be reduced. The experiments also find that starting and operating the system by loading servers one by one from the bottom of the cabinet upwards is the recommended approach for this system. The safe operating range of the system is determined to be when the outlet quality is below 0.77. Within this range, the cooling system can stably support the start-stop operations of servers as well as dynamic load switching, thereby ensuring the efficient and stable operation of the data center.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110070"},"PeriodicalIF":4.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144321838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Process intensification approach to enhancing heat and mass transfer: Radio frequency (RF) assisted drying of paper and board 加强传热和传质的过程强化方法：射频（RF）辅助干燥纸和纸板

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-19 DOI: 10.1016/j.ijthermalsci.2025.110069

Koushik Sampath, Huajiang Huang, Daipayan Sen, Shri Ramaswamy

{"title":"Process intensification approach to enhancing heat and mass transfer: Radio frequency (RF) assisted drying of paper and board","authors":"Koushik Sampath, Huajiang Huang, Daipayan Sen, Shri Ramaswamy","doi":"10.1016/j.ijthermalsci.2025.110069","DOIUrl":"10.1016/j.ijthermalsci.2025.110069","url":null,"abstract":"<div><div>Conventional multi-cylinder drying of paper and board typically relies on both conductive drying from steam-heated cylinders and convective drying, where heated air flows over the paper web surface. Conduction primarily contributes to heat transfer, while convection is the main driver of mass transfer. However, conventional drying systems are heavily dependent on steam, usually powered by fossil fuels, and are often energy-inefficient with high levels of waste. Additionally, these surface-driven processes result in a lower percentage of energy absorption compared to the energy supplied, leading to significant energy losses. To improve this long-standing process, an experimental system was developed to investigate a process intensification approach involving the integration of Radio Frequency (RF) heating, a volumetric electromagnetic technology, alongside traditional conduction and convection drying methods. This study also emphasizes the use of sensors to continuously monitor key parameters such as moisture content, supply system temperatures, sample temperatures, air flows, and drying rates in real-time. The effect of RF as an auxiliary energy source in localized environments at varying moisture levels was explored to optimize industrial drying systems, quantify potential improvements, and provide insights for future studies. Experimental results from trials combining RF with convection and with the base case alternating conduction-convection drying processes are presented. It is shown that RF is a viable process intensification approach for paper drying improving the drying rate and energy intensity at higher moisture contents. These findings offer valuable insights for process intensification and contribute to the process development, modeling, and simulation of advanced paper drying techniques.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"217 ","pages":"Article 110069"},"PeriodicalIF":4.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144312685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrigendum to “The effect of porous lattice structures on jet impingement heat dissipation performance” [Int. J. Therm. Sci. 217 (2025) 110071] “多孔晶格结构对射流冲击散热性能的影响”[j]。j .千卡。科学通报。217 (2025)110071]

IF 4.9 2区工程技术

International Journal of Thermal Sciences Pub Date : 2025-06-18 DOI: 10.1016/j.ijthermalsci.2025.110091

Miao Qian , Shaoyu Huang , Zhong Xiang , Le Liu , Yatong Yu , Jianxin Zhang

引用次数: 0