International Communications in Heat and Mass Transfer最新文献_第6页

Experimental study on the melting process in a latent heat thermal energy storage unit with cross-arranged fins 交叉排列翅片潜热蓄热装置熔化过程的实验研究

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2026-02-06 DOI: 10.1016/j.icheatmasstransfer.2026.110700

Kun Zhang , Yanmin Wang , Xin Lu , Jialei Gao , Liangbi Wang , Tianyi Yan , Kewei Song , Guangtian Shi

{"title":"Experimental study on the melting process in a latent heat thermal energy storage unit with cross-arranged fins","authors":"Kun Zhang , Yanmin Wang , Xin Lu , Jialei Gao , Liangbi Wang , Tianyi Yan , Kewei Song , Guangtian Shi","doi":"10.1016/j.icheatmasstransfer.2026.110700","DOIUrl":"10.1016/j.icheatmasstransfer.2026.110700","url":null,"abstract":"<div><div>The purpose of this study is to characterize the thermal performance of a novel cross-arranged fin latent heat thermal energy storage (LHTES) system through experiments. The analysis encompasses illustrating changes in the melting front over time and examining the impact of varying Stefan numbers (<em>Ste</em>) and Reynolds numbers (<em>Re</em>) on the melting progression. The cross-arranged fin type LHTES units promote uniform heat distribution, increase melting rates in multiple directions, and thus improve the non-uniformity of heat transfer. Therefore, compared with the longitudinal fin LHTES device, the melting time has been reduced by a maximum of 10.7 %. However, for the <em>Ste</em> number of 0.42, the melting time of the longitudinal fin LHTES unit is very close to that of the cross-arranged fins unit. The energy efficiency ratio of the new LHTES device was also calculated at different <em>Ste</em> and <em>Re</em> numbers, indicating that as the <em>Ste</em> number increases and the <em>Re</em> number decreases, the energy efficiency ratio will increase. For the intermittent heating experiment, intermittent heating significantly affected the thermal performance of the unit, balanced the heating rate in different phase change material (PCM) regions, and produced a consistent temperature distribution.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110700"},"PeriodicalIF":6.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147395779","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

Asymmetric unstable natural convection in an open-ended vertical channel with hot-cold walls 具有冷热壁的开放式垂直通道中的不对称不稳定自然对流

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2026-01-19 DOI: 10.1016/j.icheatmasstransfer.2026.110568

Chung-Gang Li

引用次数: 0

Emission characteristics of hybrid emitter ionic liquid electrospray under an alternating electric field 交变电场作用下混合发射极离子液体电喷雾的发射特性

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2026-01-18 DOI: 10.1016/j.icheatmasstransfer.2026.110545

Yuxiang Chen , Weizong Wang , Yihua Zhang , Yufeng Cheng , Guangchuan Zhang , Zhancheng Wang

{"title":"Emission characteristics of hybrid emitter ionic liquid electrospray under an alternating electric field","authors":"Yuxiang Chen , Weizong Wang , Yihua Zhang , Yufeng Cheng , Guangchuan Zhang , Zhancheng Wang","doi":"10.1016/j.icheatmasstransfer.2026.110545","DOIUrl":"10.1016/j.icheatmasstransfer.2026.110545","url":null,"abstract":"<div><div>Ionic liquid electrospray thrusters are simple, high-specific-impulse devices suited to microsatellites and typically use alternating voltage for plume self-neutralization. However, experiments have observed over-emission during polarity switching that enlarges beam divergence. The mechanism underlying this phenomenon remains unclear. To this end, molecular dynamics simulations of a hybrid emitter electrospray under alternating electric fields are performed and compared with vacuum chamber experiments to elucidate the emission characteristics. Two operating modes are investigated: the externally-wetted mode and the capillary mode. The results show that both modes exhibit a similar transient: after a polarity step the Taylor cone elongates then retracts, producing a current spike followed by a trough and gradual recovery, with the capillary mode recovering more quickly. The re-stabilization time (110–120 ps) is consistent with the liquid's charge-relaxation time. Further analysis of the charge distribution indicates that the current spike originates from rapid discharge of excess charge accumulated near the emitter head prior to reversal. Besides, the spike widens the beam divergence from ≈10° (steady) to ≈28°. Optimizing the voltage waveform mitigates this: a piecewise-linear waveform reduces the divergence peak to ≈15°. These results provide a reference for the polarity-switching mechanism and offer practical guidance for stable, long-life operation of alternating-voltage electrospray thrusters.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110545"},"PeriodicalIF":6.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034463","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 simulation of secondary flow for heat transfer enhancement and geometric parameters optimization in the twisted-rib helical tube 扭肋螺旋管内强化传热二次流数值模拟及几何参数优化

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2026-01-18 DOI: 10.1016/j.icheatmasstransfer.2026.110532

Sisi Liu , Yijia Li , Zhaolong Wang , Eryang Ming , Jingang Liu

{"title":"Numerical simulation of secondary flow for heat transfer enhancement and geometric parameters optimization in the twisted-rib helical tube","authors":"Sisi Liu , Yijia Li , Zhaolong Wang , Eryang Ming , Jingang Liu","doi":"10.1016/j.icheatmasstransfer.2026.110532","DOIUrl":"10.1016/j.icheatmasstransfer.2026.110532","url":null,"abstract":"<div><div>This study proposed a heat transfer enhancement technology utilizing the twisted-rib helical tube (TRHT). Using numerical simulation, the heat transfer enhancement mechanism driven by secondary flow under constant wall temperature was investigated, and the key parameters were optimized. A three-dimensional numerical model was employed to systematically analyze the effects of twisted-rib radius (<em>R</em><sub><em>t</em></sub>) and twisted-rib curvature (<em>τ</em>) on secondary flow characteristics, turbulent kinetic energy distribution, temperature uniformity, and overall heat transfer performance. Results demonstrate that twisted ribs significantly enhance fluid velocity and turbulence intensity within the TRHT by inducing strong secondary flow, thereby intensifying heat transfer. Under specific conditions, the cross-sectional average temperature is elevated to 324.51 K. At inlet Reynolds number (<em>Re</em>) of 25,000, the optimized parameter combination (<em>R</em><sub><em>t</em></sub> = 1.5 mm, <em>τ</em> = 0.688) achieves a 34.2% enhancement in the average Nusselt number (<em>Nu</em>) compared to that of the smooth helical tube (SHT), while the performance evaluation criteria (PEC) peaks with a 19.4% improvement. This design effectively improves temperature uniformity while enhancing heat transfer, providing theoretical foundations and parameter optimization strategies for developing high-efficiency compact heat exchangers.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110532"},"PeriodicalIF":6.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034464","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

A novel ultra-thin flexible loop-type heat pipe for application in wearable electronic devices cooling 一种用于可穿戴电子器件冷却的新型超薄柔性环形热管

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2025-12-21 DOI: 10.1016/j.icheatmasstransfer.2025.110353

Xiaoping Yang , Ziyi You , Qingjie Cui , Yonghai Zhang , Xiang Ma , Jinjia Wei

{"title":"A novel ultra-thin flexible loop-type heat pipe for application in wearable electronic devices cooling","authors":"Xiaoping Yang , Ziyi You , Qingjie Cui , Yonghai Zhang , Xiang Ma , Jinjia Wei","doi":"10.1016/j.icheatmasstransfer.2025.110353","DOIUrl":"10.1016/j.icheatmasstransfer.2025.110353","url":null,"abstract":"<div><div>As electronic devices become more compact, flexible, and integrated, such as foldable smartphones, wearables, and VR glasses, traditional cooling solutions, including graphite thermal pads and conventional heat pipes, are no longer adequate. These solutions struggle to cope with complex geometries, confined spaces, and dynamic environments due to their rigid structures. Moreover, the increasing power density in electronic devices calls for more efficient, stable, and lightweight thermal management strategies. This work presents a novel ultra-thin flexible loop-type heat pipe (UFLHP) with an evaporator thickness of only 0.7 mm. The primary wick employed a trapezoidal serrated nickel felt structure, whereas the secondary wick was fabricated from an oxidized spiral-woven copper mesh (SWM). Experiments were conducted using both single- and double-layer SWM arrangements to assess their influence on performance. A systematic investigation was carried out to evaluate the thermal performance of the UFLHP across different operational parameters. The UFLHP with a double-layer secondary wick demonstrated excellent thermal performance, capable of handling heat fluxes up to 7 W/cm<sup>2</sup>, with a thermal resistance as low as 0.987 K/W and an equivalent thermal conductivity of 24,204.4 W/(m·K). It remained stable even under a 90° bend, effectively managing up to 5 W of heat input with a thermal resistance of 2.22 K/W, exhibiting strong flexibility and adaptability. A theoretical model was developed to estimate steady-state parameters, including temperature and thermal resistance, and to analyze the influence of pipe diameter on system performance. At high power levels, the model predicted the evaporator temperature with an error of less than 15 %.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110353"},"PeriodicalIF":6.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837227","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

Construction of polymer micro-scale rheological model considering viscous dissipation heat based on online testing method 基于在线测试方法的考虑粘性耗散热的聚合物微尺度流变模型构建

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2025-12-26 DOI: 10.1016/j.icheatmasstransfer.2025.110388

Qun Yang, Junjie Liu, Jiazheng Xiong, Baishun Zhao, Wangqing Wu (吴旺青)

{"title":"Construction of polymer micro-scale rheological model considering viscous dissipation heat based on online testing method","authors":"Qun Yang, Junjie Liu, Jiazheng Xiong, Baishun Zhao, Wangqing Wu (吴旺青)","doi":"10.1016/j.icheatmasstransfer.2025.110388","DOIUrl":"10.1016/j.icheatmasstransfer.2025.110388","url":null,"abstract":"<div><div>In micro-injection molding, the polymer melt experiences high shear rates and strong thermo-mechanical coupling processes. The accompanying significant viscous dissipation effects substantially influence the micro-scale viscosity of the polymer melt, which cannot be neglected. However, the viscosity models used in common simulation software fail to account for viscous dissipative heat effects, resulting in limited accuracy in flow prediction. Therefore, this work proposes a technical solution for online viscosity measurement to characterize the viscosity properties of polymethyl methacrylate (PMMA) and cycloolefin copolymer (COC). The melt temperature rise was monitored synchronously during viscosity testing. Unlike previous models that neglect viscous dissipation, this work integrated measured dissipation temperature into the Cross-WLF model. The model was applied to simulate filling in microfluidic chips and compared with actual injection molding experiments. Results showed that after accounting for viscous dissipation, the average simulation-to-experiment errors for PMMA cover plates and substrates were 3.36% and 3.67%, respectively, while corresponding errors for COC components were 2.61% and 2.94%. This demonstrates that the model significantly improves prediction accuracy for microinjection molding filling processes. The method proposed in this work has significant practical value, as it can substantially enhance the simulation accuracy during the filling stage, thereby advancing micro-injection molding toward higher precision and efficiency.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110388"},"PeriodicalIF":6.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837237","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

Thermal wave reflection and refraction in two-layered composite materials under a moving heat source 移动热源作用下双层复合材料的热波反射与折射

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2025-12-18 DOI: 10.1016/j.icheatmasstransfer.2025.110318

Wei Wu, Tao Xue, Xiaobing Zhang

引用次数: 0

Thermo-hydraulic characterization of dual-flow minichannel heat sinks with reliability and multi-coolant assessment for thermal management of IGBT 基于可靠性的双流小通道散热器热水力特性及IGBT热管理多冷却剂评估

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2025-12-17 DOI: 10.1016/j.icheatmasstransfer.2025.110274

Vijay Kumar Mahto, Alankrita Singh

{"title":"Thermo-hydraulic characterization of dual-flow minichannel heat sinks with reliability and multi-coolant assessment for thermal management of IGBT","authors":"Vijay Kumar Mahto, Alankrita Singh","doi":"10.1016/j.icheatmasstransfer.2025.110274","DOIUrl":"10.1016/j.icheatmasstransfer.2025.110274","url":null,"abstract":"<div><div>As the power density of Insulated Gate Bipolar Transistors (IGBTs) continues to increase in electric vehicles, aerospace and renewable energy systems, the associated heat flux and risk of thermal failure rise significantly. Efficient dissipation of generated heat and reliable thermal management have therefore become critical for ensuring device performance and lifetime. This study investigates the novel Dual Flow Minichannel Heat Sink (DF-MCHS) for liquid cooling of an original IGBT module. Performance is evaluated in terms of Nusselt number, junction temperature, thermal resistance and Thermal Performance Index (TPI) under steady operating conditions at a module power loss of 600 W. The dual flow arrangement and geometric enhancements improve heat transfer by promoting uniform flow distribution, generating recirculating vortices, and disrupting thermal boundary layers. These mechanisms intensify fluid mixing and extend coolant residence time, thereby enhancing turbulence and convective heat transfer. As a result, at Reynolds number of 6000, the Nusselt number increases by 61.8 % for DF-MCHS and reaches 75.3 % for the DF-MCHS with integrated H-junction and interrupted channels (DF-MCHS-HI), compared to the conventional Straight MCHS. The junction temperature is reduced by 8.7 °C and 10.5 °C for DF-MCHS and DF-MCHS-HI, respectively, while achieving a case-to-sink thermal resistance for DF-MCHS is 68 % lower than the manufacturer datasheet value. TPI values confirm superior thermal-hydraulic performance, with DF-MCHS-HI doubling device lifetime while enhancing energy efficiency and supporting UN sustainable goals. Water achieved the highest cooling efficiency, whereas ethylene glycol mixtures and kerosene balanced thermal performance with low-temperature resilience for aerospace applications.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110274"},"PeriodicalIF":6.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797875","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

A CFD analysis on expanding the operating range of a dry gas ejector with R245fa via supplemental vapor injection R245fa补充注汽扩大干气喷射器工作范围的CFD分析

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2025-12-15 DOI: 10.1016/j.icheatmasstransfer.2025.110322

F. Wang, Z.X. Shen, L.H. Wang

{"title":"A CFD analysis on expanding the operating range of a dry gas ejector with R245fa via supplemental vapor injection","authors":"F. Wang, Z.X. Shen, L.H. Wang","doi":"10.1016/j.icheatmasstransfer.2025.110322","DOIUrl":"10.1016/j.icheatmasstransfer.2025.110322","url":null,"abstract":"<div><div>Ejectors frequently operate under off-design conditions, underscoring the importance of effective regulation strategies. This study proposes a novel ejector configuration incorporating an auxiliary nozzle to extend its operational range. The most effective injection location for supplementary working vapor is first identified through comparative analysis of multiple intake positions. Subsequently, the internal flow characteristics of the conventional and novel ejector geometries are simulated and compared under identical operating conditions to elucidate the underlying working mechanisms. Finally, systematic investigations are conducted to evaluate the effects of operational and geometric parameters of the supplementary nozzle and mixing chamber on the ejector's performance envelope. Results demonstrate that the supplementary mixing chamber represents the optimal injection location among the three configurations tested. The introduction of supplementary working fluid restores the ejector to critical-mode operation, effectively extending its stable working range. Across this extended range, it ensures a consistently higher COP than the baseline system under the conditions investigated in this study. For fixed operating conditions, optimal parameters of a 30° vapor injection angle and a minimum mixing chamber length ratio of 14 maximize the operational range.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110322"},"PeriodicalIF":6.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797914","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 external heat flux on thermal behavior of the modeled porous ceramics-based phase change materials with steel slag and fly ash solid wastes using molecular dynamics simulation 利用分子动力学模拟研究了外热通量对钢渣和粉煤灰固体废物制备的多孔陶瓷基相变材料热行为的影响

IF 6.4 2区工程技术

International Communications in Heat and Mass Transfer Pub Date : 2026-03-01 Epub Date: 2025-12-17 DOI: 10.1016/j.icheatmasstransfer.2025.110247

Qiang Lu , Qing Yang , Ali B.M. Ali , Narinderjit Singh Sawaran Singh , M. Hashemi , Riadh Marzouki

{"title":"Effect of external heat flux on thermal behavior of the modeled porous ceramics-based phase change materials with steel slag and fly ash solid wastes using molecular dynamics simulation","authors":"Qiang Lu , Qing Yang , Ali B.M. Ali , Narinderjit Singh Sawaran Singh , M. Hashemi , Riadh Marzouki","doi":"10.1016/j.icheatmasstransfer.2025.110247","DOIUrl":"10.1016/j.icheatmasstransfer.2025.110247","url":null,"abstract":"<div><div>The study's primary goal was to evaluate the atomic-scale and thermal behavior of porous ceramic-based phase change materials (PCMs) restructured with industrial by-products, steel slag and fly ash, under external heat-flux conditions. The components were deliberately selected to fabricate cost-effective, eco-friendly ceramic matrices that enhance structural stability and heat transfer performance. Molecular dynamics (MD) simulation was performed in a periodic box of 100 Å to model a eutectic KNO<sub>3</sub>-NaNO<sub>3</sub> salt confined within the porous ceramic framework. The system was finally equilibrated in the NVT ensemble and then subjected to varying heat flux levels to examine the effects of heat flux on atomic mobility, interatomic interactions, and energy transport. The atomic motion became visibly more intense with increasing heat flux. The mean-squared displacement (MSD) increased to 2.23 Å<sup>2</sup>, whereas the maximum density of the system reached 0.080 atoms/nm<sup>3</sup>, indicating enhanced atomic compactness. Despite this increased mobility, thermal conductivity decreased to 1.18 W/m·K, attributed to more frequent atomic collisions that disrupted coherent heat-conduction pathways. Meanwhile, fully charging and discharging times were reduced to 7.98 ns and 7.26 ns, respectively, indicating a faster thermal response and greater energy exchange efficiency. Overall, the results imply that porous ceramics reinforced with steel slag and fly ash could be very robust and sustainable substrates for future thermal energy storage applications.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110247"},"PeriodicalIF":6.4,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145797919","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