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A novel coaxial open annular TSV pin-fin embedded in microchannels to comprehensively improve the thermal stability, signal integrity, and heat transfer of 3D integrated circuits 一种新型同轴开放式环形TSV引脚鳍嵌入微通道,全面提高三维集成电路的热稳定性、信号完整性和传热性能
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-26 DOI: 10.1016/j.icheatmasstransfer.2026.110619
Ying Yin , Zhimin Wang , Siyuan Ma , Yan Li , Liang Gong
As a key component of three-dimensional integrated circuits (3D-ICs), through‑silicon vias (TSVs) located between vertically stacked chips greatly affect interlayer electrical signal transmission efficiency, thermal stability, and system cooling performance. To ensure optimal electrical and thermal performance, this study combines the signal integrity benefits of ground-signal-ground (GSG) coaxial shielding TSV with the enhanced heat dissipation of an open annular pin-fin design, proposing a novel coaxial open annular TSV (COA-TSV) pin-fin structure. Based on this structure, we systematically investigate its thermal stress distribution under cyclic thermal loading, evaluate signal integrity at different frequencies, and analyze the effects of pin-fin arrangement (inline and staggered) and operating conditions on flow and heat transfer within the embedded interlayer microchannel. Besides, we conduct a comprehensive comparison between the proposed COA-TSV and the conventional cylindrical TSV (C-TSV) for the aforementioned performance metrics. Results show that the maximum thermal stress in the COA-TSV is concentrated at the interface between the interconnect and chip layers, with a smaller variation amplitude than that of the conventional C-TSV. While both TSVs exhibit increased insertion loss with rising signal frequency, the degradation is significantly greater in the C-TSV. Furthermore, the interlayer microchannel with COA-TSV pin-fins achieves the highest performance evaluation criterion across Reynolds numbers (Re = 200–998), confirming its superior thermo-hydraulic performance. These findings provide valuable insights for optimizing TSV structures and achieving efficient thermal management in 3D-ICs.
作为三维集成电路(3d - ic)的关键部件,位于垂直堆叠芯片之间的硅通孔(tsv)对层间电信号传输效率、热稳定性和系统冷却性能有很大影响。为了确保最佳的电气和热性能,本研究将地-信-地(GSG)同轴屏蔽TSV的信号完整性优势与开放式环形引脚鳍设计的增强散热性相结合,提出了一种新型同轴开放式环形TSV (COA-TSV)引脚鳍结构。基于该结构,系统地研究了其在循环热载荷下的热应力分布,评估了不同频率下的信号完整性,并分析了针鳍排列(串连和交错)和工作条件对嵌入层间微通道内流动和传热的影响。此外,我们还就上述性能指标对提出的COA-TSV和传统的圆柱形TSV (C-TSV)进行了全面的比较。结果表明:COA-TSV的最大热应力集中在互连层和芯片层之间的界面处,其变化幅度小于常规C-TSV;虽然两种tsv的插入损耗都随着信号频率的升高而增加,但C-TSV的衰减明显更大。此外,具有COA-TSV针鳍的层间微通道在雷诺数范围内(Re = 200-998)达到了最高的性能评价标准,证实了其优越的热液性能。这些发现为优化TSV结构和实现3d - ic的高效热管理提供了有价值的见解。
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引用次数: 0
Thermal behaviour of a truncated cone immersed in Newtonian liquids with free convective flow 截锥浸入具有自由对流的牛顿液体中的热行为
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-26 DOI: 10.1016/j.icheatmasstransfer.2026.110635
E. Ragulkumar , K. Suresh , Wesley Jeevadason Aruldoss
This work quantitatively examines natural convection heat transfer from heated and cooled truncated cones submerged in Newtonian fluids (air and water). A finite-volume computational fluid dynamics method was used using ANSYS CFX 17.0, solving the governing continuity, momentum, and energy equations under the Boussinesq approximation. The computational domain was discretized with enhanced boundary-layer resolution, and a steady-state convergence criteria of 10−5 was established for all governing equations. The correctness of the model was confirmed using recognized benchmark data for truncated-cone convection, demonstrating excellent agreement. The research methodically assesses the impact of several truncation levels (25%, 50%, and 75%) on the strength of buoyancy-driven flow, isotherm development, and thermal efficiency. The findings indicate that water routinely yields Nusselt numbers that are 30–40% more than those of air, attributable to its enhanced thermophysical characteristics, while simultaneously demonstrating 25–35% elevated skin friction owing to its higher viscosity and density. The 25% truncation resulted in the most pronounced thermal gradients, the swiftest upward flow, and the greatest heat transfer rates, enhancing average Nusselt number by roughly 28% compared to the whole cone [24]. The thermal boundary layer in water is substantially thinner, resulting in higher buoyant forces. Flow separation zones and reattachment sites are highly correlated with the observed double-peak structure in local Nusselt profiles. Skin-friction patterns clearly differentiate areas of flow acceleration, thinning boundary layers, and post-separation stability. Truncation geometry has a direct impact on the strength of natural convection currents, which affects both heat removal capabilities and fluid-surface contact. The study quantifies the influence of fluid thermophysical properties and truncation geometry on convective performance, providing essential guidelines for the design of aerospace thermal components, solar collectors, geothermal systems, industrial chimneys, and other applications requiring optimized natural convection.
这项工作定量地考察了浸在牛顿流体(空气和水)中的加热和冷却截锥的自然对流传热。基于ANSYS CFX 17.0,采用有限体积计算流体力学方法,求解Boussinesq近似下的控制连续性、动量和能量方程。利用增强的边界层分辨率对计算域进行离散化,并对所有控制方程建立了10−5的稳态收敛准则。利用公认的截锥对流基准数据验证了该模型的正确性,结果表明该模型具有较好的一致性。该研究系统地评估了几种截断水平(25%、50%和75%)对浮力驱动流强度、等温线发展和热效率的影响。研究结果表明,由于其增强的热物理特性,水通常比空气产生30-40%的努塞尔数,同时由于其更高的粘度和密度,表面摩擦增加25-35%。25%的截短导致了最明显的热梯度、最快的向上流动和最大的换热率,平均努塞尔数比整个锥体增加了约28%。水中的热边界层明显变薄,导致浮力增大。流动分离区和再附着位置与局部Nusselt剖面观测到的双峰结构高度相关。表面摩擦模式清楚地区分了流动加速、边界层变薄和分离后稳定性的区域。截尾几何形状直接影响自然对流的强度,从而影响散热能力和流体表面接触。该研究量化了流体热物理性质和截尾几何对对流性能的影响,为航空航天热元件、太阳能集热器、地热系统、工业烟囱和其他需要优化自然对流的应用的设计提供了重要指导。
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引用次数: 0
CGAN-based optimization of B-spline hole shapes under constant cross-section area constraint for enhanced film cooling 恒截面约束下基于cgan的b样条孔形状优化
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-24 DOI: 10.1016/j.icheatmasstransfer.2026.110612
Shaolin Gan, Hong Wei, Yingqing Zu
Average cooling effectiveness and uniformity are key indicators for evaluating film cooling performance. The shape and cross-sectional area of film cooling holes exert a direct influence on this performance. This study focuses on the optimization of film cooling hole shapes with same cross-sectional areas, based on closed B-spline curves. A Conditional Generative Adversarial Network (CGAN) is employed as a surrogate model to rapidly and directly predict the cooling effectiveness distribution downstream of the film cooling holes. Taking the average cooling effectiveness and its standard deviation as the optimization objectives, a multi-island genetic algorithm (MIGA) is applied to obtain the Pareto-optimal solution set. Four representative optimized hole shapes are obtained. The results show that, compared to the cylindrical hole, optimized holes 1 and 2 enhance the average cooling effectiveness by 96.2% and 85.4% respectively. In terms of average film-cooling effectiveness, optimized holes 1 and 2 also exhibit significant advantages over cusp-shaped hole. Optimized holes 3 and 4 outperform cylindrical hole in both the average film-cooling effectiveness and its standard deviation. To assess comprehensive performance, we also evaluated the stress concentration factors, discharge coefficients, and total pressure loss coefficients of different holes. Optimized hole 1, optimized hole 2, and cusp-shaped holes all exhibit relatively low stress concentration factors, total pressure loss coefficients, and discharge coefficients. Moreover, optimized hole 1 exhibits the highest cooling effectiveness, along with the lowest stress concentration factor and total pressure loss coefficient.
平均冷却效率和均匀性是评价气膜冷却性能的关键指标。气膜冷却孔的形状和截面积对其性能有直接影响。本文主要研究基于闭合b样条曲线的相同横截面积的气膜冷却孔形状的优化问题。采用条件生成对抗网络(Conditional Generative Adversarial Network, CGAN)作为替代模型,快速、直接地预测气膜冷却孔下游的冷却效率分布。以平均冷却效率及其标准差为优化目标,采用多岛遗传算法求解pareto最优解集。得到了四种具有代表性的优化孔形。结果表明,与圆柱孔相比,优化后的孔1和孔2的平均冷却效率分别提高了96.2%和85.4%。在平均气膜冷却效率方面,优化后的孔1和孔2也比尖头孔具有显著的优势。优化后的孔3和孔4在平均气膜冷却效率和标准偏差上都优于圆柱孔。为了评估综合性能,我们还评估了不同井眼的应力集中系数、排放系数和总压损失系数。优化孔1、优化孔2和尖形孔均表现出较低的应力集中系数、总压损失系数和流量系数。优化后的1号井冷却效果最佳,应力集中系数和总压损失系数最低。
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引用次数: 0
Timely melting - Solidification cycles for optimizing the PCM efficiency in space 及时的熔化-凝固循环优化空间PCM效率
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-24 DOI: 10.1016/j.icheatmasstransfer.2026.110625
Homayoun Badfar , Diana C. Dubert , Jaume Massons , Josefina Gavaldà , Mounir M. Bou-Ali , Xavier Ruiz , Valentina Shevtsova
The present study deals with a multifaceted approach to heat transfer in phase-change materials (PCM), focusing on melting - solidification full cycle of n-Eicosane, and applying a varying range of thermal conditions relevant to space applications. Special attention is given to the thermocapillary effect, or Marangoni convection, as it plays a critical role in the heat transfer process of PCMs under microgravity conditions. The domain proposed for the present paper is modeled having the upper surface exposed to air and the range of varying boundary conditions are imposed on the end walls. This numerical study on n-Eicosane complements our previous work [7], which focused on gallium. The most efficient scenario involves reversing the temperature between the cold and hot walls at key timesteps, prior to full melting or thermal equilibrium is achieved. The results show that by using a sufficient number of boundary condition switches at short time interval between them can significantly enhance the heat transfer rate, which is crucial for spacecraft applications.
本研究涉及相变材料(PCM)传热的多方面方法,重点关注n-二十烷的熔化-凝固全周期,并应用与空间应用相关的各种热条件。特别关注热毛细效应,或马兰戈尼对流,因为它在微重力条件下PCMs的传热过程中起着关键作用。本文所提出的域是将上表面暴露在空气中,并在端壁上施加一系列不同的边界条件的模型。这项关于正二烷的数值研究补充了我们以前的工作[7],重点是镓。最有效的方案是在完全融化或达到热平衡之前,在关键时间步骤逆转冷壁和热壁之间的温度。结果表明,在较短的时间间隔内使用足够数量的边界条件开关可以显著提高换热率,这对航天器应用具有重要意义。
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引用次数: 0
Thermal performance improvement of solar desalination system integrated with a heat pump, evacuated tube, hanging wick, reflector, and cover cooling 采用热泵、真空管、吊芯、反射器、盖式冷却的太阳能脱盐系统的热性能改进
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-24 DOI: 10.1016/j.icheatmasstransfer.2026.110591
Joy Djuansjah , Mohamed M. Younes , Abanob Joseph , Mohamed Abdelgaied , Sabbah Ataya , Sung-Hwan Jang , Swellam W. Sharshir
This work studied the performance of the hanging wick tubular solar still (TSS) using three experimental configurations. In Case 1, the system was tested using a heat pump and an evacuated tube water heater. Case-2 added cover cooling to the prior configuration. In Case-3, a reflector was added to the previous configuration. The modified TSS's performance was compared to that of the reference TSS (CSS) using three different test sets performed under same atmospheric conditions. The results revealed that the daily production for TSS (Case-1), TSS (Case-2), and TSS (Case-3) was 14.88, 16.28, and 19.27 L/m2, respectively. Additionally, employing cover cooling or reflector increased TSS output by 21% and 105%, respectively. Consequently, the tested adjustments to the TSS demonstrated a considerable improvement in both productivity and efficiency, making them highly effective enhancements for boosting TSS performance, with productivity reaching nearly 20 L/m2. day. The freshwater produced via TSS (Case-3) cost was 0.0169 $/L which decreased by 27.8% compared to CSS and reduced carbon emissions by 8.47 tons CO₂, saving $122.75.
本文采用三种不同的实验结构对挂芯管式太阳能蒸馏器的性能进行了研究。在案例1中,系统使用热泵和真空管热水器进行测试。Case-2在之前的配置上增加了盖冷却。在Case-3情况下,在前面的配置中增加了一个反射器。在相同的大气条件下,通过三种不同的测试装置,对改进后的TSS与参考TSS (CSS)的性能进行了比较。结果表明,菌株TSS (Case-1)、TSS (Case-2)和TSS (Case-3)的日产量分别为14.88、16.28和19.27 L/m2。此外,采用盖冷却或反射器分别使TSS产量增加21%和105%。因此,对TSS的测试调整表明,在生产率和效率方面都有了相当大的改善,使它们成为提高TSS性能的非常有效的增强,生产率达到近20 L/m2。的一天。通过TSS (Case-3)生产淡水的成本为0.0169美元/升,比CSS降低了27.8%,减少了8.47吨CO₂的排放,节省了122.75美元。
{"title":"Thermal performance improvement of solar desalination system integrated with a heat pump, evacuated tube, hanging wick, reflector, and cover cooling","authors":"Joy Djuansjah ,&nbsp;Mohamed M. Younes ,&nbsp;Abanob Joseph ,&nbsp;Mohamed Abdelgaied ,&nbsp;Sabbah Ataya ,&nbsp;Sung-Hwan Jang ,&nbsp;Swellam W. Sharshir","doi":"10.1016/j.icheatmasstransfer.2026.110591","DOIUrl":"10.1016/j.icheatmasstransfer.2026.110591","url":null,"abstract":"<div><div>This work studied the performance of the hanging wick tubular solar still (TSS) using three experimental configurations. In Case 1, the system was tested using a heat pump and an evacuated tube water heater. Case-2 added cover cooling to the prior configuration. In Case-3, a reflector was added to the previous configuration. The modified TSS's performance was compared to that of the reference TSS (CSS) using three different test sets performed under same atmospheric conditions. The results revealed that the daily production for TSS (Case-1), TSS (Case-2), and TSS (Case-3) was 14.88, 16.28, and 19.27 L/m<sup>2</sup>, respectively. Additionally, employing cover cooling or reflector increased TSS output by 21% and 105%, respectively. Consequently, the tested adjustments to the TSS demonstrated a considerable improvement in both productivity and efficiency, making them highly effective enhancements for boosting TSS performance, with productivity reaching nearly 20 L/m<sup>2</sup>. day. The freshwater produced via TSS (Case-3) cost was 0.0169 $/L which decreased by 27.8% compared to CSS and reduced carbon emissions by 8.47 tons CO₂, saving $122.75.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110591"},"PeriodicalIF":6.4,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146073687","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
Synergistic enhancement of battery volumetric energy and power density via induction heating-assisted calendering 通过感应加热辅助压延的电池体积能量和功率密度的协同增强
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-24 DOI: 10.1016/j.icheatmasstransfer.2026.110639
Shaohai Dong, Yuhang Lyu, Weiwei Zhu, Zhan-Sheng Guo
Calendering is a crucial step in lithium-ion battery (LIB) electrode manufacturing, as it strongly influences electrode microstructure, mechanical integrity, and electrochemical behavior. This study introduces an innovative induction heating-assisted calendering (IHAC) technique that enables non-contact, directional heating of the current collector, allowing precise thermal control and microstructural tailoring during compaction. The effects of IHAC on the thickness, morphology, interfacial adhesion, and impedance of LiFePO4 electrodes were systematically investigated, and the processed electrodes were further evaluated electrochemically. Discrete element simulations revealed that IHAC produces a surface porosity of 36.5% and an internal porosity of 27.3%, corresponding to a 36.7% enhancement in surface porosity compared with conventional calendering. This graded pore structure was validated by scanning electron microscopy. Within the temperature range of 25–130 °C, IHAC substantially improved electrode properties and electrochemical performance. At an optimal temperature of 70 °C, the IHAC-processed electrode exhibited a thickness of 189.8 μm, a peel force of 13.3 N m−1, a resistance of 7.41 Ω·cm, a 2C discharge capacity of 142.4 mAh/g, and a cycle life of 267 cycles at 90% capacity retention. In comparison, the HC electrode under the same condition measured 189 μm, 12.2 N m−1, 7.33 Ω·cm, 139.8 mAh/g, and 251 cycles. Moreover, relative to conventional calendering at 25 °C, the IHAC-processed electrode achieved a 1.65% reduction in thickness, a 26.7% improvement in adhesion, a 7.7% decrease in resistance, a 2% increase in 2C discharge capacity, and a 40% extension in cycle life. These improvements arise from a “hot-core/cold-surface” thermal gradient that induces plastic deformation in the electrode interior while maintaining surface elasticity. Upon cooling, a functionally graded microstructure forms, featuring a porous surface and dense core, which enhances both energy and power performance. These findings highlight the critical role of thermal gradient directionality in determining electrode architecture and demonstrate IHAC as a promising pathway for the synergistic enhancement of volumetric energy and power density in LIBs. Owing to its non-contact operation, high efficiency, and cost-effectiveness, IHAC offers a practical and scalable solution for advanced battery manufacturing and contributes a new approach to more sustainable battery production globally.
压延是锂离子电池(LIB)电极制造的关键步骤,因为它强烈影响电极的微观结构、机械完整性和电化学行为。本研究介绍了一种创新的感应加热辅助压延(IHAC)技术,该技术可以实现电流集电极的非接触式定向加热,从而在压实过程中实现精确的热控制和微结构定制。系统地研究了IHAC对LiFePO4电极厚度、形貌、界面粘附力和阻抗的影响,并对制备的电极进行了进一步的电化学评价。离散元模拟显示,IHAC的表面孔隙度为36.5%,内部孔隙度为27.3%,与常规压延相比,表面孔隙度提高了36.7%。通过扫描电镜验证了这种分级孔隙结构。在25-130℃的温度范围内,IHAC显著改善了电极性能和电化学性能。在70°C的最佳温度下,ihac电极的厚度为189.8 μm,剥离力为13.3 N m−1,电阻为7.41 Ω·cm, 2C放电容量为142.4 mAh/g,循环寿命为267次,容量保持率为90%。在相同条件下,HC电极的放电强度为189 μm, 12.2 N m−1,7.33 Ω·cm, 139.8 mAh/g,循环次数为251次。此外,与传统的25°C压延工艺相比,ihac加工的电极厚度减少了1.65%,附着力提高了26.7%,电阻降低了7.7%,2C放电容量增加了2%,循环寿命延长了40%。这些改进源于“热芯/冷表面”热梯度,该梯度在保持表面弹性的同时诱导电极内部的塑性变形。冷却后,形成一个功能梯度的微观结构,具有多孔的表面和致密的核心,提高了能量和功率性能。这些发现强调了热梯度方向性在决定电极结构中的关键作用,并证明IHAC是lib中协同增强体积能量和功率密度的有希望的途径。由于其非接触式操作、高效率和成本效益,IHAC为先进电池制造提供了实用且可扩展的解决方案,并为全球更可持续的电池生产提供了新途径。
{"title":"Synergistic enhancement of battery volumetric energy and power density via induction heating-assisted calendering","authors":"Shaohai Dong,&nbsp;Yuhang Lyu,&nbsp;Weiwei Zhu,&nbsp;Zhan-Sheng Guo","doi":"10.1016/j.icheatmasstransfer.2026.110639","DOIUrl":"10.1016/j.icheatmasstransfer.2026.110639","url":null,"abstract":"<div><div>Calendering is a crucial step in lithium-ion battery (LIB) electrode manufacturing, as it strongly influences electrode microstructure, mechanical integrity, and electrochemical behavior. This study introduces an innovative induction heating-assisted calendering (IHAC) technique that enables non-contact, directional heating of the current collector, allowing precise thermal control and microstructural tailoring during compaction. The effects of IHAC on the thickness, morphology, interfacial adhesion, and impedance of LiFePO<sub>4</sub> electrodes were systematically investigated, and the processed electrodes were further evaluated electrochemically. Discrete element simulations revealed that IHAC produces a surface porosity of 36.5% and an internal porosity of 27.3%, corresponding to a 36.7% enhancement in surface porosity compared with conventional calendering. This graded pore structure was validated by scanning electron microscopy. Within the temperature range of 25–130 °C, IHAC substantially improved electrode properties and electrochemical performance. At an optimal temperature of 70 °C, the IHAC-processed electrode exhibited a thickness of 189.8 μm, a peel force of 13.3 N m<sup>−1</sup>, a resistance of 7.41 Ω·cm, a 2C discharge capacity of 142.4 mAh/g, and a cycle life of 267 cycles at 90% capacity retention. In comparison, the HC electrode under the same condition measured 189 μm, 12.2 N m<sup>−1</sup>, 7.33 Ω·cm, 139.8 mAh/g, and 251 cycles. Moreover, relative to conventional calendering at 25 °C, the IHAC-processed electrode achieved a 1.65% reduction in thickness, a 26.7% improvement in adhesion, a 7.7% decrease in resistance, a 2% increase in 2C discharge capacity, and a 40% extension in cycle life. These improvements arise from a “hot-core/cold-surface” thermal gradient that induces plastic deformation in the electrode interior while maintaining surface elasticity. Upon cooling, a functionally graded microstructure forms, featuring a porous surface and dense core, which enhances both energy and power performance. These findings highlight the critical role of thermal gradient directionality in determining electrode architecture and demonstrate IHAC as a promising pathway for the synergistic enhancement of volumetric energy and power density in LIBs. Owing to its non-contact operation, high efficiency, and cost-effectiveness, IHAC offers a practical and scalable solution for advanced battery manufacturing and contributes a new approach to more sustainable battery production globally.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110639"},"PeriodicalIF":6.4,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146073934","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
Impact of methanol solvation on Li+/Cl- transport through graphene nanopores 甲醇溶剂化对Li+/Cl-通过石墨烯纳米孔传输的影响
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-24 DOI: 10.1016/j.icheatmasstransfer.2026.110626
Youqi Zhang , Xiaopeng Zhang , Gaohong He , Junjiang Bao , Ning Zhang
Reverse electrodialysis heat engines (REDHEs) are promising for harvesting low-grade thermal energy, yet conventional salt aqueous solutions as working fluids perform poorly below 100 °C, reducing exergy efficiency. Efficient recovery from low-grade thermal energy therefore requires a solvent with a low boiling point and facile ion transport. Methanol meets these criteria, making it a strong candidate for high-performance REDHEs. However, current membranes are optimized for water-based reverse electrodialysis, where hydrated ions deliver osmotic energy. In methanol systems, customized membranes are needed to accommodate methanol-solvated ions and enable efficient energy conversion. To this end, we investigated the structure and dynamics of methanol-solvated ions using molecular dynamics simulations, providing fundamental insights into solvent-ion interactions relevant to REDHEs design. In this study, LiCl-methanol solution was used as a working fluid and graphene nanosheets with nanopores in varying diameters as selective membranes. Ion transport driven by salinity gradients was investigated. As pore size increased from 0.89 to 1.87 nm, ion flux rate rose sharply. Li+ flux rate increased from negligible levels to 3.727 × 105 mol·m−2·h−1, while Cl flux rate reached 5.760 × 105 mol·m−2·h−1, demonstrating strong size-dependent transport. When nanopore diameters approached the second solvation shell, methanol desolvation was required, reducing permeability and increasing the energy barrier. These results provide clear evidence that the size-exclusion effect of graphene nanopores critically governs ion transport. The study confirms the feasibility of LiCl-methanol solutions as a working fluid and highlights nanopore size as a key determinant of ions selectivity and permeability, offering insights for designing next-generation membranes for high-efficiency REDHEs.
反电渗析热机(REDHEs)有望收集低品位的热能,但传统的盐水溶液作为工作流体在100°C以下表现不佳,降低了火用效率。因此,从低品位热能中有效回收需要具有低沸点和易于离子传输的溶剂。甲醇符合这些标准,使其成为高性能REDHEs的有力候选者。然而,目前的膜是针对水基反电渗析进行优化的,其中水合离子提供渗透能。在甲醇系统中,需要定制膜来容纳甲醇溶剂化离子并实现有效的能量转换。为此,我们利用分子动力学模拟研究了甲醇溶剂化离子的结构和动力学,为与REDHEs设计相关的溶剂-离子相互作用提供了基本的见解。本研究以licl -甲醇溶液为工作流体,以具有不同直径纳米孔的石墨烯纳米片为选择性膜。研究了盐度梯度驱动的离子输运。随着孔径从0.89 nm增大到1.87 nm,离子通量率急剧上升。Li+通量从可以忽略的水平增加到3.727 × 105 mol·m−2·h−1,而Cl−通量达到5.760 × 105 mol·m−2·h−1,表现出强烈的尺寸依赖输运。当纳米孔径接近第二溶剂化层时,需要甲醇脱溶,降低了渗透率,增加了能垒。这些结果提供了明确的证据,证明石墨烯纳米孔的尺寸排斥效应对离子传输起关键作用。该研究证实了licl -甲醇溶液作为工作流体的可行性,并强调了纳米孔大小是离子选择性和渗透性的关键决定因素,为设计下一代高效redes膜提供了见解。
{"title":"Impact of methanol solvation on Li+/Cl- transport through graphene nanopores","authors":"Youqi Zhang ,&nbsp;Xiaopeng Zhang ,&nbsp;Gaohong He ,&nbsp;Junjiang Bao ,&nbsp;Ning Zhang","doi":"10.1016/j.icheatmasstransfer.2026.110626","DOIUrl":"10.1016/j.icheatmasstransfer.2026.110626","url":null,"abstract":"<div><div>Reverse electrodialysis heat engines (REDHEs) are promising for harvesting low-grade thermal energy, yet conventional salt aqueous solutions as working fluids perform poorly below 100 °C, reducing exergy efficiency. Efficient recovery from low-grade thermal energy therefore requires a solvent with a low boiling point and facile ion transport. Methanol meets these criteria, making it a strong candidate for high-performance REDHEs. However, current membranes are optimized for water-based reverse electrodialysis, where hydrated ions deliver osmotic energy. In methanol systems, customized membranes are needed to accommodate methanol-solvated ions and enable efficient energy conversion. To this end, we investigated the structure and dynamics of methanol-solvated ions using molecular dynamics simulations, providing fundamental insights into solvent-ion interactions relevant to REDHEs design. In this study, LiCl-methanol solution was used as a working fluid and graphene nanosheets with nanopores in varying diameters as selective membranes. Ion transport driven by salinity gradients was investigated. As pore size increased from 0.89 to 1.87 nm, ion flux rate rose sharply. Li<sup>+</sup> flux rate increased from negligible levels to 3.727 × 10<sup>5</sup> mol·m<sup>−2</sup>·h<sup>−1</sup>, while Cl<sup>−</sup> flux rate reached 5.760 × 10<sup>5</sup> mol·m<sup>−2</sup>·h<sup>−1</sup>, demonstrating strong size-dependent transport. When nanopore diameters approached the second solvation shell, methanol desolvation was required, reducing permeability and increasing the energy barrier. These results provide clear evidence that the size-exclusion effect of graphene nanopores critically governs ion transport. The study confirms the feasibility of LiCl-methanol solutions as a working fluid and highlights nanopore size as a key determinant of ions selectivity and permeability, offering insights for designing next-generation membranes for high-efficiency REDHEs.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"172 ","pages":"Article 110626"},"PeriodicalIF":6.4,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074103","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
Neural network approach to MHD micropolar bioconvective flow under hall and thermal radiation effects in porous media 多孔介质中霍尔效应和热辐射效应下MHD微极生物对流流动的神经网络研究
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-24 DOI: 10.1016/j.icheatmasstransfer.2026.110599
Vimal K. Joshi , Gunisetty Ramasekhar , Laltesh Kumar , Salman Saleem , Kushal Sharma
This study investigates steady magnetohydrodynamic micropolar fluid flow over a linearly stretching surface embedded in a porous medium, incorporating Hall current effects, Brownian motion, thermophoresis, and bioconvection due to motile microorganisms. The model also includes thermal radiation and internal heat generation or absorption, along with nonlinear chemical reaction, to analyse their effects on thermal field. The corresponding dimensionless parameters are used to evaluate the impact of the physical phenomenon under consideration. A notable influence of the micropolar effects, porosity, and radiation is observed on velocity, temperature, and microrotation, highlighting their applicability to porous and bioconvective transport systems. Additionally, an artificial neural network (ANN) framework is employed to assess predictive capability. The results are validated with the numerical results, demonstrating an excellent agreement. The combined numerical-ANN approach provides an efficient way to optimize the heat transfer characteristics in thermal engineering applications.
本研究研究了嵌入多孔介质的线性拉伸表面上的稳定磁流体动力学微极流体流动,包括霍尔电流效应、布朗运动、热电泳和由运动微生物引起的生物对流。该模型还包括热辐射和内部热的产生或吸收,以及非线性化学反应,以分析它们对热场的影响。使用相应的无量纲参数来评估所考虑的物理现象的影响。微极效应、孔隙度和辐射对速度、温度和微旋的显著影响,突出了它们对多孔和生物对流运输系统的适用性。此外,采用人工神经网络(ANN)框架对预测能力进行评估。结果与数值计算结果吻合良好。数值与人工神经网络相结合的方法为热工应用中的传热特性优化提供了一种有效的方法。
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引用次数: 0
Numerical and experimental evaluation of energy conversion efficiency and muzzle kinetic energy in a Laval tube gas cannon 拉瓦尔管气体炮能量转换效率和炮口动能的数值与实验评价
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-23 DOI: 10.1016/j.icheatmasstransfer.2026.110553
Yang He , Huiming Bao , Yunzhi Liu, Yayun Zhang, Jinghui Peng, Songjing Li
This study investigates a single-stage gas cannon launcher incorporating a convergent–divergent Laval tube designed to reshape pressure waves and enhance energy conversion efficiency. A three-dimensional computational fluid dynamics (CFD) model, validated experimentally, was developed to simulate the transient pressure-wave propagation and resulting projectile dynamics. Results indicate that routing the high-pressure gas through the Laval tube increases projectile kinetic energy at the muzzle exit by over 12% relative to a straight-chamber configuration at matched charge and geometry. Under zero-clearance launch, where the gas hits the base of the projectile, a second shock from the tube slows the loss of acceleration and adds over 3% more energy. Bench-scale firing experiments confirmed the numerical predictions and demonstrated the clear energetic advantage of the Laval tube configuration. In addition, the effective operating pressure range and optimal Laval tube geometry were identified. These findings provide guidance for enhancing energy conversion efficiency and potentially reducing the required charge in gas cannon systems.
本文研究了一种采用会聚-发散拉瓦尔管的单级气体炮发射装置,该装置旨在重塑压力波并提高能量转换效率。建立了三维计算流体动力学(CFD)模型,并进行了实验验证,以模拟瞬态压力波传播和由此产生的弹丸动力学。结果表明,在装药和几何形状相匹配的情况下,高压气体通过拉瓦尔管可以使弹丸在枪口出口处的动能增加12%以上。在零间隙发射时,当气体击中弹丸的底部时,来自管道的第二次冲击减缓了加速度的损失,并增加了超过3%的能量。实验证实了数值预测,并证明了拉瓦尔管结构的明显能量优势。此外,还确定了有效工作压力范围和最佳拉瓦尔管几何形状。这些发现为提高气体炮系统的能量转换效率和潜在地减少所需的装药提供了指导。
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引用次数: 0
A novel hexagonal honeycomb-like geometric-gradient flow field for PEM water electrolyzers 用于PEM水电解槽的新型六边形蜂窝状几何梯度流场
IF 6.4 2区 工程技术 Q1 MECHANICS Pub Date : 2026-01-23 DOI: 10.1016/j.icheatmasstransfer.2026.110597
Hongwei Zhan, Zhidong Chen, Shuyuan Wang, Wencheng Chen, Jing zhang, Shuting Li, Lei Chen, Yanqiang Kong, Lijun Yang, Xiaoze Du
Improving electrochemical performance while maintaining thermally stable operation is a critical challenge in the design of flow fields for proton exchange membrane water electrolyzers (PEMWEs). In this paper, a hexagonal honeycomb-like geometric-gradient flow field (HLGFF) is proposed and numerically investigated as an evolution of the conventional honeycomb-like design. The proposed HLGFF is designed to mitigate under-rib mass transfer limitations and gas accumulation by redirecting part of the in-plane flow momentum toward the through-plane direction, thereby enhancing reactant supply and gas removal near the reaction interface. A three-dimensional, two-phase, non-isothermal multiphysics model is developed and experimentally validated using a parallel flow field configuration. Numerical results indicate that the HLGFF significantly enhances mass transport and electrochemical performance, achieving a maximum current density increase of 17.72% at the same operating voltage compared with conventional flow field designs. Despite operating at higher current densities and increased heat generation, the HLGFF maintains a well-controlled temperature distribution comparable to reference configurations, reflecting effective flow-field-induced heat redistribution. These results demonstrate that the proposed design achieves a favorable balance between electrochemical performance enhancement and thermal stability, offering a promising flow field strategy for high-performance PEMWE applications.
在保持热稳定运行的同时提高电化学性能是质子交换膜水电解槽(PEMWEs)流场设计的关键挑战。本文提出了一种六边形类蜂窝状几何梯度流场,并对其进行了数值研究。提出的HLGFF旨在通过将部分平面内流动动量重定向到平面方向来减轻肋下传质限制和气体积聚,从而增强反应界面附近的反应物供应和气体去除。建立了一个三维两相非等温多物理场模型,并利用平行流场结构进行了实验验证。数值结果表明,HLGFF显著提高了质量输运和电化学性能,在相同工作电压下,与常规流场设计相比,电流密度最大提高了17.72%。尽管在更高的电流密度下工作,产生的热量也增加了,但与参考配置相比,HLGFF保持了良好的温度分布控制,反映了有效的流场诱导的热量再分配。这些结果表明,所提出的设计在电化学性能增强和热稳定性之间取得了良好的平衡,为高性能PEMWE应用提供了一种有前途的流场策略。
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International Communications in Heat and Mass Transfer
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