International Journal of Heat and Mass Transfer最新文献_第3页

Experimental study on models of velocity and heat transfer of n-butanol spill fire 正丁醇溢火速度与传热模型的实验研究

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-15 DOI: 10.1016/j.ijheatmasstransfer.2025.127956

Ranran Li , Manhou Li

{"title":"Experimental study on models of velocity and heat transfer of n-butanol spill fire","authors":"Ranran Li , Manhou Li","doi":"10.1016/j.ijheatmasstransfer.2025.127956","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127956","url":null,"abstract":"<div><div>Spill fire refers to a fire scenario in which the leakage liquid fuel is ignited during its spreading process. Although the spill fire exhibits a lower burning rate than pool fire, it significantly increases the fire risk due to the continuously expanding combustion area. The heat and mass transfer mechanism and physical model of spill fire velocity have not yet been established. This investigation is performed within a trench that has dimensions of 100 cm in length and 20 cm in width. The heat transfer characteristics and model of spill fire velocity are explored at six discharge rates (<em>V̇</em> = 80, 120, 160, 210, 290, 380 mL/min) and seven slope angles (<em>θ</em> = 0°, 1°, 2°, 3°, 4°, 5°, 7°). It is observed that the steady-state burning area of spill fire diminishes and finally disappears as the slope increases, while the velocity of spill fire exhibits a trend of increasing - decreasing - increasing. A predictive model for the velocity of spill fire is developed based on the mechanical equilibrium. At lower discharge rates (<em>V̇</em> = 80, 120, 160 mL/min), the values of velocity of subsurface flow (<em>u<sub>s</sub></em>) and spill fire velocity (<em>u<sub>f</sub></em>) are close, with <em>u<sub>s</sub></em> slightly larger than <em>u<sub>f</sub></em>. At higher discharge rates (<em>V̇</em> = 210, 290, 380 mL/min), the values of <em>u<sub>s</sub></em> and <em>u<sub>f</sub></em> remain close in the slope range of 0° to 3°. However, once the slope exceeds 3°, the relative difference between the two velocities ranges from 25 % to 167 %. Therefore, the predictive model is not suitable for the spill fire in gravity-dominated stage. Additionally, a heat transfer model for subsurface flow area is established, revealing that when the spill fire cannot spread over whole trench, the forced convection heat loss contributes between 84.14 % and 96.34 % of total heat flux.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127956"},"PeriodicalIF":5.8,"publicationDate":"2025-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145326214","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

An insight into the heat transfer and the flow characteristics for mixed convection horizontal cross-flow film boiling over an arbitrarily oriented ellipsoid 对在任意方向椭球上沸腾的混合对流水平横流膜的传热和流动特性的深入研究

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-15 DOI: 10.1016/j.ijheatmasstransfer.2025.127926

Rohit Kumar, B. Premachandran

{"title":"An insight into the heat transfer and the flow characteristics for mixed convection horizontal cross-flow film boiling over an arbitrarily oriented ellipsoid","authors":"Rohit Kumar, B. Premachandran","doi":"10.1016/j.ijheatmasstransfer.2025.127926","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127926","url":null,"abstract":"<div><div>The present study numerically investigates the problem of mixed convection horizontal cross-flow film boiling over an arbitrarily oriented ellipsoid. The numerical methodology employs the multi-directional moment of fluid (MOF) method to track the interface over a fixed Eulerian grid. We investigate the effect of different flow and geometrical parameters on the flow dynamics and heat transfer characteristics of the problem. At low Reynolds numbers, a periodic vapor bubble ebullition cycle is observed. However, the vapor bubble pinch-off location shifts away from the heated ellipsoid as the non-dimensional wall superheat increases. Additionally, the non-dimensional departure diameter of the vapor bubble is observed to decrease as the Reynolds number increases. In contrast, the non-dimensional departure diameter of the vapor bubble increases with an increase in wall superheat. The periodic vapor bubble ebullition cycle reveals that the flow field around the heated ellipsoid is intricately connected to the dynamics of the interface, with recirculations forming and dying near the heated interface as a result of the movement of the interface. At a high Reynolds number, the vapor wake completely shifts to the rear of the heated ellipsoid. The coefficient of vapor drag on the heated ellipsoid is observed to decrease as the aspect ratio increases. The asymmetry in vapor mass generation around the heated ellipsoid was observed to decrease with the orientation of the heated ellipsoid.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127926"},"PeriodicalIF":5.8,"publicationDate":"2025-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145326216","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

Thermo-fluid and economic performance of PCHEs in a high-temperature thermal energy storage system coupled with an sCO2 Brayton cycle PCHEs在与sCO2 Brayton循环耦合的高温热能储存系统中的热流体和经济性能

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-14 DOI: 10.1016/j.ijheatmasstransfer.2025.127918

Alexandre Guille , Malini Bangalore Mohankumar , Uwe Hampel , Sebastian Unger

{"title":"Thermo-fluid and economic performance of PCHEs in a high-temperature thermal energy storage system coupled with an sCO2 Brayton cycle","authors":"Alexandre Guille , Malini Bangalore Mohankumar , Uwe Hampel , Sebastian Unger","doi":"10.1016/j.ijheatmasstransfer.2025.127918","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127918","url":null,"abstract":"<div><div>This paper focuses on a printed circuit heat exchanger as the primary heat exchanger between thermal energy storage systems and supercritical CO<sub>2</sub> Brayton cycles. Four atmospheric-pressure gases, CO<sub>2</sub>, N<sub>2</sub>, He, and Ar, were assessed as heat transfer fluid on the storage side as well as different channel designs, such as straight channels, zigzag channels, and airfoil fins. To that end, a 1D model, based on experimental and numerical correlations established in the literature, has been developed to optimize and evaluate the total costs of a 1 MW PCHE over a period of 20 years. It was shown that a large portion of the total costs is employed to compensate for the relatively high pressure drop on the hot side, due to the low gas density at low pressures. Therefore, various configurations of double-banked hot plates with different designs for the hot and cold channels were modeled and simulated under diverse boundary conditions. The results indicate that CO<sub>2</sub> has the highest potential as a heat transfer fluid due to lower associated costs. An optimized design of a PCHE for a TES application is proposed, which reduces the costs by increasing the cross-section of the gas flow, leading to the costs being 0.259 $ per Watt and year.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127918"},"PeriodicalIF":5.8,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145325634","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

Pressure and multiphase flow effects on CO2 storage in hydrate-based cap: A comprehensive analysis 压力和多相流对水合物基帽中CO2储存影响的综合分析

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-14 DOI: 10.1016/j.ijheatmasstransfer.2025.127960

Bingbing Chen, Jing Chen, Mingyu Wu, Huiru Sun, Mingjun Yang, Tao Yu, Yongchen Song

{"title":"Pressure and multiphase flow effects on CO2 storage in hydrate-based cap: A comprehensive analysis","authors":"Bingbing Chen, Jing Chen, Mingyu Wu, Huiru Sun, Mingjun Yang, Tao Yu, Yongchen Song","doi":"10.1016/j.ijheatmasstransfer.2025.127960","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127960","url":null,"abstract":"<div><div>CO<sub>2</sub> hydrate cap plays a crucial role in the long-term carbon storage in sub-marine reservoirs, and its formation is influenced by various factors, such as storage pressure and flow conditions. However, systematic investigations of the dynamic formation and stability of hydrate caps under multiphase flow process, particularly regarding the coupled effects of storage pressure and flow regimes, are still lacking. Therefore, this study explores the formation dynamics and stability behaviors of CO<sub>2</sub> hydrate sealing cap under varying pressures and flow rates during CO<sub>2</sub> single-phase and CO<sub>2</sub>-H<sub>2</sub>O two-phase flow. The experimental findings indicated that the hydrate cap was uniformly distributed under CO<sub>2</sub> single-phase flow, while a more dispersed distribution occurred in CO<sub>2</sub>-H<sub>2</sub>O two-phase flow, particularly at lower gas fractional flow (20∼40 %). Moreover, the formation time of the hydrate cap decreased with increasing storage pressure and CO<sub>2</sub> fractional flow. Notably, storage pressure had a more significant effect on rapid hydrate cap formation. Decreasing the pressure from 5 MPa to 3 MPa resulted in a formation time that was approximately 4 times longer. Furthermore, the hydrate cap formed under CO<sub>2</sub> single-phase flow shows greater stability than that formed under CO<sub>2</sub>-H<sub>2</sub>O two-phase flow. These insights offer vital guidance for developing the efficient CO<sub>2</sub> storage strategies in submarine environments.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127960"},"PeriodicalIF":5.8,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145326365","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

Heat transfer modelling of radiant flux from a halogen lamp for enhancing Infrared thermography simulation 卤素灯辐射通量的传热模型以增强红外热成像模拟

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-14 DOI: 10.1016/j.ijheatmasstransfer.2025.127961

Van-Duong Le , Luis Espinosa , Marie-Laetitia Pastor , Marianne Perrin , Yannick Le Maoult

{"title":"Heat transfer modelling of radiant flux from a halogen lamp for enhancing Infrared thermography simulation","authors":"Van-Duong Le , Luis Espinosa , Marie-Laetitia Pastor , Marianne Perrin , Yannick Le Maoult","doi":"10.1016/j.ijheatmasstransfer.2025.127961","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127961","url":null,"abstract":"<div><div>InfraRed Thermography (IRT) is widely used in Non-Destructive Evaluation (NDE) for its ability to provide real-time, two-dimensional, non-contact measurements of heat distribution. Enhancing the analysis of thermal results requires a comprehensive understanding of the entire measurement chain from the heat source, through propagation, to detection, signal processing and data interpretation, which demands an effective combination of simulation and experimental approaches. This study presents the modelling of heat transfer, with particular emphasis on accurately characterising the radiant heat flux emitted by a halogen lamp. A fluxmeter sensor was employed to measure the radiant heat flux at different distances and spatial locations. Subsequently, 3D heat transfer models incorporating these heat sources were established and applied to an Acrylonitrile Butadiene Styrene plate to investigate thermal behaviour and the influence of factors within the measurement chain. Critical parameters were also considered, including thermal conductivity, convective heat transfer coefficients, fluxmeter sensor sensitivity, heat flux characteristics and measurement methods. Simulation results were validated against experimental data using both an infrared camera and a pyrometer and demonstrated strong agreement. Relative errors were below 4.2 % for pyrometer measurements, whereas slightly higher errors, up to 5.9 % for IRT method, which is mainly attributed the influence of environmental factors on this technique. These findings confirm the accuracy and reliability of the calibrated heat source and modelling parameters. Integrating experimental data into the thermal simulation enhances both accuracy and consistency, thereby establishing a more robust framework for the application of numerical methods throughout the IRT measurement chain in NDE applications.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127961"},"PeriodicalIF":5.8,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145325633","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

Influence of substrate flexibility and temperature on thermal patterns of sessile droplet evaporation 衬底柔韧性和温度对无根液滴蒸发热模式的影响

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-14 DOI: 10.1016/j.ijheatmasstransfer.2025.127949

Qiaoling Xiong , Lu Liu , Ye Chen , Yuping Li , Teng Wang , Xinyu Dong

{"title":"Influence of substrate flexibility and temperature on thermal patterns of sessile droplet evaporation","authors":"Qiaoling Xiong , Lu Liu , Ye Chen , Yuping Li , Teng Wang , Xinyu Dong","doi":"10.1016/j.ijheatmasstransfer.2025.127949","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127949","url":null,"abstract":"<div><div>The evaporation of sessile droplets on flexible substrates is widely used in various fields, including wearable devices, soft robotics, and flexible electronic devices. Although the evaporation behavior of sessile droplets on flexible substrates has been studied, there is still insufficient research on the evolution of droplet thermal patterns during evaporation. This study explored the thermal pattern evolution and mode transitions of evaporating isopropanol droplets on PDMS substrates under varying flexibility and temperature conditions. The results show that with the increase of substrate flexibility and temperature, the thermocapillary convection within the droplet gradually strengthens, leading to a higher Marangoni number and an increased number of convective cells. At a PDMS temperature of 50 °C with a curing ratio of 10:1, only Bénard-Marangoni convection is observed. As the substrate flexibility increases, hydrothermal waves begin to appear and gradually dominate during the evaporation process. At curing ratio of 10:1, Bénard-Marangoni convection is the only pattern at 35 °C and 50 °C, while longitudinal rolls appear at 65 °C and become the only pattern at higher temperatures. This study identifies the critical conditions for transitions between different thermal patterns, providing new insights into thermal pattern within evaporating droplet on flexible surfaces.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127949"},"PeriodicalIF":5.8,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145326220","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 investigation on the effect of oxidation on subcooled boiling under highly subcooled conditions 高过冷条件下氧化对过冷沸腾影响的实验研究

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-14 DOI: 10.1016/j.ijheatmasstransfer.2025.127953

Hongchi Yao, Ye Tao, Jing Luo, Hongtao Liu, Wenquan Wang, Jiguo Tang

{"title":"Experimental investigation on the effect of oxidation on subcooled boiling under highly subcooled conditions","authors":"Hongchi Yao, Ye Tao, Jing Luo, Hongtao Liu, Wenquan Wang, Jiguo Tang","doi":"10.1016/j.ijheatmasstransfer.2025.127953","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127953","url":null,"abstract":"<div><div>Surface oxidation is an inherent phenomenon in boiling that fundamentally alters the heating surface through changes in chemical composition, roughness, and wettability, thereby significantly affecting heat transfer performance. This study experimentally investigates the effects of surface oxidation on both nucleate boiling and microbubble emission boiling (MEB) under highly subcooled conditions. The results indicate that while oxidation increases surface roughness and enhances wettability, thereby increasing the critical heat flux (CHF), the progressive accumulation of insulating oxide layers (Cu₂O/CuO) introduces considerable thermal resistance, ultimately decreasing the heat transfer coefficient over repeated boiling cycles. In nucleate boiling with high heat flux, the maximum bubble diameter and interval time exhibit minimal variation across multiple cycles, suggesting that heat transfer deterioration is primarily due to oxide-induced thermal resistance rather than changes in bubble dynamics. In MEB, surface oxidation reduces bubble oscillation frequency and decreases the spatial-temporal uniformity of oscillations. Acoustic measurements further show that the sound pressure level and amplitude of the high-frequency peak increase with oxidation in nucleate boiling. In MEB, oxidation shifts the dominant frequency peaks toward lower frequencies. Although surface oxidation has minimal impact on the correlation between SPL and heat flux in MEB, it significantly alters the relationship between SPL and wall superheat. This study provides insight into the effects of repeated boiling cycles on subcooled boiling, emphasizing the importance of considering surface conditions when designing and optimizing boiling heat transfer applications under highly subcooled conditions.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127953"},"PeriodicalIF":5.8,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145326366","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

Phase-change heat transfer enhancement in in-line high shear reactors via a pore-array distributor 通过孔阵列分布器增强在线高剪切反应器的相变传热

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-13 DOI: 10.1016/j.ijheatmasstransfer.2025.127942

Xinhui Yang , Xiaoning Li , Hu Ye , Guixuan Shan , Bingyan Liu , Jiangjiexing Wu , Jinli Zhang

{"title":"Phase-change heat transfer enhancement in in-line high shear reactors via a pore-array distributor","authors":"Xinhui Yang , Xiaoning Li , Hu Ye , Guixuan Shan , Bingyan Liu , Jiangjiexing Wu , Jinli Zhang","doi":"10.1016/j.ijheatmasstransfer.2025.127942","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127942","url":null,"abstract":"<div><div>High shear reactors (HSRs) are effective for rapid reactions due to their superior micro-mixing and mass transfer capabilities. However, their application in highly exothermic reactions is often constrained by insufficient heat dissipation. Direct contact phase-change heat transfer (DC-PCHT), utilizing low-boiling-point inert fluids for latent heat exchange, presents a potential breakthrough for intensified temperature control, but its integration within HSRs remains underexplored. This study investigates the synergistic coupling of DC-PCHT and HSRs using response surface methodology with n-pentane–water model system, focusing on the role of liquid distributors in enhancing heat transfer performance. By integrating experimental measurements, we quantify heat transfer performance via volumetric heat transfer coefficients and vaporization rates, and systematically evaluate the effects of operating parameters (rotor speed, temperature difference, flow rate) and distributor structure (pore diameter, distributor outer diameter, number of pore rows). Results reveal that distributor-induced pre-dispersion and localized shear significantly boost thermal performance, with up to 8.98% improvement in volumetric heat transfer coefficient. A dimensionless correlation is established to guide scale-up and structural design. This work provides mechanistic insight into phase-change-enhanced heat transfer in HSRs and offers a scalable strategy for managing high thermal loads in multiphase reactive systems.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127942"},"PeriodicalIF":5.8,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145264302","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

Parametric modeling and thermal optimization of novel bionic heat sinks inspired by leaf venation 叶脉结构启发的新型仿生散热器参数化建模与热优化

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-13 DOI: 10.1016/j.ijheatmasstransfer.2025.127940

Xilai Wang , Zhiyu Zhou , Haiwang Li , Gang Xie , Long Meng

{"title":"Parametric modeling and thermal optimization of novel bionic heat sinks inspired by leaf venation","authors":"Xilai Wang , Zhiyu Zhou , Haiwang Li , Gang Xie , Long Meng","doi":"10.1016/j.ijheatmasstransfer.2025.127940","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.127940","url":null,"abstract":"<div><div>Nonuniform heat transfer problems in integrated circuits and turbine blade lead to parametric optimizations of various heat sinks. But the finite parameters of the current heat sinks have limited their performance. Based on the self-grown novel heat sinks in our previous study inspired by leaf venation, this study constructs 3 parametric models (Curve A, B and C) defined by 4, 19 and 20 parameters each to preserve the key characters of novel heat sinks. To increase the efficiency of the optimization with large scale of variables, this study proposes Grouped Genetic Algorithm (GGA) which divides the whole variables into several groups and conducts Standard Genetic Algorithm (SGA) in each subspace gradually. In this study, optimizations are conducted with SGA and GGA for 3 curves in a centrally peaked boundary condition to minimize the maximum wall temperature. 1D pipe-net and 2D heat conduction methods are employed for heat transfer calculation and the optimized results are analyzed numerically. As the results show, on one hand, GGA has a better convergence with the difference of the average and minimum value within 5 K for all the curves while that of SGA over 10 K for Curve B and C. On the other hand, the maximum temperature of the optima of GGA is 10.8, 23.6 and 15.8 K lower than that of SGA on average. Fundamentally, the advantage is attributed to the proper distribution of coolant heat transfer rate relative to the cooling demand derived from the thermal boundary. The optimal channel from GGA absorbs over 1700 W within 45 % of the radial range, which eliminates central hotspot. And its circumferential distribution is more uniform than that from SGA, which avoids local overheat in regions without channel extension. The optimized heat sinks in this study can provide a skeleton for the channel system design in nonuniform boundary conditions.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"256 ","pages":"Article 127940"},"PeriodicalIF":5.8,"publicationDate":"2025-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145326219","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

Mass and heat transfer resistivities at liquid–vapor interfaces: Beyond the ideal gas 液-气界面的质量和传热电阻率：超出理想气体

IF 5.8 2区工程技术

International Journal of Heat and Mass Transfer Pub Date : 2025-10-13 DOI: 10.1016/j.ijheatmasstransfer.2025.127943

Henning Struchtrup

引用次数: 0