International Communications in Heat and Mass Transfer最新文献

{"title":"Analysis of the synergetic effects of grooved gas diffusion layer and semi-blocked flow channels in improving proton exchange membrane fuel cells performance","authors":"Bahar Amani,&nbsp;Amir Zanj","doi":"10.1016/j.icheatmasstransfer.2025.108973","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108973","url":null,"abstract":"<div><div>Low volumetric power density is one of the barriers to the commercialization of proton exchange membrane fuel cells. Various techniques have been introduced to increase their power density, including modifications to the reactant flow fields to optimize species delivery to the catalyst layer. This study compares the impact of two performance-enhancing techniques on proton exchange membrane fuel cells: a semi-blocked flow channel and a grooved gas diffusion layer numerically using the finite volume method. The research introduces a novel cathode configuration combining both methods to assess their synergetic effects on proton exchange membrane fuel cell performance. Results demonstrate that while at a cell voltage of 0.6 V, the semi-blocked flow channel enhances performance by 0.569 %, and the grooved GDL yields a 0.292 % improvement; integrating both techniques achieves a synergistic enhancement exceeding 1 %. Additionally, the study examines how groove width and GDL characteristics influence the effectiveness of the introduced configuration, offering insights into optimizing cathode design for superior PEMFC performance.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108973"},"PeriodicalIF":6.4,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851787","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}

{"title":"A study of unsteady mixed convection in porous corrugated enclosures with magnetic fields","authors":"Pankaj Choudhary ,&nbsp;Rajan Kumar","doi":"10.1016/j.icheatmasstransfer.2025.108923","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108923","url":null,"abstract":"&lt;div&gt;&lt;div&gt;In this study, we performed a numerical analysis of unsteady two-dimensional coupled natural and mixed convective flows in a porous corrugated geometry under the influence of magnetic field. A higher order compact (HOC) scheme is employed to discretize the nonlinear coupled transport equations. The outcomes of simulations are analyzed across a range of critical parameters, including the Darcy Number (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), Reynolds Number (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;100&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;1000&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), Grashof Number (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;msup&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;6&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), Richardson number (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;100&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), Hartmann number (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;25&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;150&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), and Prandtl Number (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;015&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; to &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;10&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;). Also, analyzing three distinct configurations based on the height of heat sources can provide valuable insights into their thermal performance and Nusselt number variations. The maximum augmentation of the mean Nusselt values on the thermal and non-thermal boundary surfaces in ascending and descending patterns at different critical parameters are viz. &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;G&lt;/mi&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;87&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;65&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; &amp; &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;81&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;12&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;D&lt;/mi&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;217&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;16&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; &amp; &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;62&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;23&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;H&lt;/mi&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;510&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;30&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; &amp; &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;45&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;51&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;R&lt;/mi&gt;&lt;mi&gt;e&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;42&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;41&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; &amp; &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;36&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;13&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;), and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;P&lt;/mi&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;474&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;38&lt;/mn&gt;&lt;mtext&gt;%&lt;/mtext&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; &amp; &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mn&gt;32&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108923"},"PeriodicalIF":6.4,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143850048","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}

{"title":"A modified nonlocal model with length and time scale parameters for analyzing vibrations of rotating Nanobeams in a magnetic field under harmonic thermal loading","authors":"Mohammed Aldandani,&nbsp;Ahmed E. Abouelregal","doi":"10.1016/j.icheatmasstransfer.2025.108972","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108972","url":null,"abstract":"<div><div>This research bridges a critical gap in the understanding of rotating nanobeams by introducing a novel thermoelastic model that incorporates nonlocal effects, thermal dynamics, and magnetic field interactions. Traditional models, which primarily relied on classical elasticity theories, often failed to capture the nuanced interplay between size-dependent phenomena and external influences. The innovation of this study lies in integrating the modified Klein-Gordon nonlocal elasticity theory with the Euler-Bernoulli beam framework, providing a more precise depiction of nanobeam behavior during rotation. Notably, this model incorporates an internal length scale and time scale, paired with the dual-phase lag (DPL) heat conduction model, which uniquely accounts for two distinct thermal response delays. The numerical results reveal several key findings: rotation significantly amplifies thermal stresses, while the inclusion of nonlocal effects reduces these stresses, highlighting the importance of considering size-dependent mechanics. Furthermore, axial magnetic fields were found to enhance nanobeam stability, while variable thermal loads introduced complex dynamic behaviors requiring advanced mathematical tools, such as Laplace transforms and state-space methods, to unravel. Validation of the model against existing literature demonstrates its precision, with a reported improvement of up to 15 % in predicting thermal and mechanical responses under nonlocal and dual-phase lag conditions. This study not only advances theoretical understanding but also provides a robust framework for future applications in nanotechnology, including nanoscale sensors, actuators, and energy systems.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108972"},"PeriodicalIF":6.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844300","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}

{"title":"Disentangle the intrinsic line tension from the nano-corrugations induced by surface lateral roughness","authors":"Zhilin Long ,&nbsp;Zifeng Yuan ,&nbsp;Hao Wang","doi":"10.1016/j.icheatmasstransfer.2025.108957","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108957","url":null,"abstract":"<div><div>Line tension of the contact line plays an important role in microscopic wetting, but its understanding remains vague and the reported values are far from convergence. We note in most studies the contact lines are treated as smooth lines as the droplets are considered as smooth spherical caps. Here using helium ion microscopy, we confirm ubiquitous nano-corrugations along the contact lines even on smooth solids like mica. The corrugation size is correlated with the lateral roughness, which represents the lateral characteristic size of the solid roughness elements. A remodified Young's equation for line tension is therefore derived by including the corrugations and the droplet deformation in the surface energy calculations. By applying the remodified Young's equation, the nonlinear relationship between the apparent contact angle and the droplet radius reported in experiments can be well explained, and a converged line tension value is given around 10⁻¹⁰ J/m.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108957"},"PeriodicalIF":6.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844299","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}

{"title":"Hybrid lattice Boltzmann-finite volume method for solving coupled radiation-convection heat transfer in complex geometries","authors":"Hongchao Miao ,&nbsp;Lin Mu ,&nbsp;Hongchao Yin ,&nbsp;Shuang Wang ,&nbsp;Ming Dong ,&nbsp;Yan Shang ,&nbsp;Hang Pu","doi":"10.1016/j.icheatmasstransfer.2025.108963","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108963","url":null,"abstract":"<div><div>An integrated algorithm was established for the first time to investigate coupled radiation-convection heat transfer in complex geometries. The radiative transfer equation was solved using the finite volume method with pseudo-time stepping. An immersed-boundary method based on an implicit diffuse interface was employed to impose irregular boundaries. The proposed algorithm was successfully implemented within the framework of the thermal lattice Boltzmann method. In the participatory medium, the precision and performance of the algorithm were inspected in terms of natural convection with systematic parameters including the optical thickness, Planck number, wall emissivity, scattering albedo, and forced convection at various Reynolds numbers. The superior performance of the present approach results from the encrypted non-uniform mesh improving the computational accuracy, saving resources, and not requiring extraordinary treatment for arbitrary shape boundaries. Thermal plumes and static bifurcations are remarkable phenomena that emerge owing to environmental influences. The results indicate that radiation dominates the heat transfer around the annulus in natural convection at low <em>Pl</em> and <em>τ</em>, whereas its imperceptible effects on forced convection are alleviated as the increases of <em>Re</em>. The thermohydrodynamic characteristics of radiation and geometry are of immediate significance in such scientific and engineering problems.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108963"},"PeriodicalIF":6.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844301","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}

{"title":"Experimental investigation on anti-frosting characteristics of biphilic surfaces coupled with hygroscopic droplets for frosting control","authors":"Wei Su ,&nbsp;Dahai Zhao ,&nbsp;Xu Jin ,&nbsp;Zhongyan Liu ,&nbsp;Qian Yu ,&nbsp;Xiaosong Zhang","doi":"10.1016/j.icheatmasstransfer.2025.108971","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108971","url":null,"abstract":"<div><div>The inhibition of condensation frosting is of fundamental importance for various anti-frosting applications. However, icing on the entire surface is ultimately inevitable for most passive anti-frosting strategies due to the freezing of subcooled droplets on surface edge or defect and the subsequent frosting propagation. Herein, we design six patterned biphilic surfaces for changing the spatial distribution of hygroscopic droplets, and further control vapor diffusion flux during the initial stage of condensation frosting, achieving efficient and long-lasting frost prohibition. Discontinuous Ringlike stripe Biphilic with breakpoint overcomes the inhomogeneous accumulation behavior of the hygroscopic solution and enhanced surface water vapor pressure field, which delays the emergence and freezing of condensing droplets on the surface and reduces the frost propagation velocity. Under conditions of a surface temperature of −10 °C and a relative humidity of 50 %, the overall anti-icing duration reached 386–423 min, with the frost delay time being 15 to 20 times longer than that of conventional superhydrophobic surfaces. The results highlight the critical role of the surface water vapor pressure and vapor flux in influencing the kinetics of condensed droplet embryo formation and frost propagation kinetics, expand the application of hygroscopic solutions and biphilic surfaces, and provide valuable insights into the design of surfaces with tailored antifreeze properties for a variety of applications</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108971"},"PeriodicalIF":6.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844298","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}

{"title":"Numerical analysis of fast cook-off and case failure characteristics of solid rocket motor with AP/HTPE star-charged","authors":"Kaile He,&nbsp;Yonggang Yu","doi":"10.1016/j.icheatmasstransfer.2025.108975","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108975","url":null,"abstract":"<div><div>To investigate the cook-off response and heat transfer in AP (ammonium perchlorate)/HTPE (hydroxyl-terminated polyether) solid rocket motor (SRM) under fast cook-off conditions (FCC), a three-dimensional numerical model based on the BDP (Becksted-Derr-Price), chemical-thermal decomposition scheme was developed. This model incorporates propellant ignition and combustion reactions. The study conducted numerical simulations under FCC with heating rates of 1.6 K/s to 2.4 K/s. the grid-node separation method was used to effectively characterize the motor casing's dynamic response during large deformations. Results show that ignition occurs in the propellant's bottom annular region, with multiple hot spots forming simultaneously. The ignition delay time is linearly related to the heating rate, and varying heating rates did not significantly affect ignition temperature. Post-ignition, combustion pressure caused limited casing damage, with no detonation. The motor case remained largely intact, though severe deformation and fragmentation occurred near the ignition site, accompanied by longitudinal cracks.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108975"},"PeriodicalIF":6.4,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143847350","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}

{"title":"Advanced heat sink designs for high-efficiency thermal management in concentrated photovoltaic systems","authors":"Morteza Khoshvaght-Aliabadi ,&nbsp;Parvaneh Ghodrati ,&nbsp;Yong Tae Kang","doi":"10.1016/j.icheatmasstransfer.2025.108965","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108965","url":null,"abstract":"<div><div>In concentrated photovoltaic (CPV) systems, thermal management is typically achieved through active cooling techniques to prevent efficiency degradation and cell damage. However, a key limitation of these techniques is their inability to maintain uniform temperatures across all cells. This study explores advanced liquid-cooled aluminum heat sink designs with novel fin arrangements under varying concentration ratios, to identify the optimal configuration for maximum temperature uniformity. The findings reveal that while integral fin designs achieve lower cell temperatures and reduce thermal stress, interrupted fin designs offer superior temperature uniformity and help decrease pumping power and unit weight. Specifically, the improvements in temperature uniformity for interrupted fin designs with 1, 2, 3, and 4 fin rows are 15 %, 17.2 %, 30.6 %, and 29.1 %, respectively. The best temperature uniformity is achieved with enhanced fin designs that incorporate a higher fin density in the downstream region of the heat sink, ensuring a temperature difference of less than 1 K between cells. The optimal design achieves an overall thermal-hydraulic performance of 1.38 under high and ultra-high conditions, with a maximum thermal stress of 37.59 MPa. Additionally, this configuration results in the smallest weight increase of the cooling unit (22.5 %) compared to the finless model.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108965"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838624","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}

{"title":"Stress-blended eddy simulation of shock and film cooling for trailing edge cutback in supersonic flow","authors":"Wei Du ,&nbsp;Qiankun Jia ,&nbsp;Lei Luo ,&nbsp;Han Yan ,&nbsp;Xingchen Li ,&nbsp;Yinghou Jiao","doi":"10.1016/j.icheatmasstransfer.2025.108961","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108961","url":null,"abstract":"<div><div>This study employs stress-blended eddy simulation to examine shock interference and film cooling behavior in a supersonic crossflow. Coolant coverage and fluid dynamics are evaluated at two mass flow ratios (<em>MFR</em>) and four typical lip shapes. Numerical schlieren techniques effectively capture shock-expansion wave dynamics, providing the flow behavior visualization. The complete wave system includes the strong shock-separation shock on the pressure lip and symmetric lip-shocks accompanied by an expansion fan on the suction lip. Notably, the weak shock II is identified as a key factor influencing transient heat transfer and coolant mixing downstream of the cutback. Film cooling efficiency in supersonic crossflow is shown to depend strongly on coolant momentum. Quantitatively, the area-averaged cooling efficiency increased by a maximum of 28.5 % as the <em>MFR</em> increased. At lower <em>MFR</em>, variations in the recirculation zone and the interaction with Shock II reveal how lip geometry impacts cooling performance. Additionally, instantaneous film instability is analyzed to understand their impact on wall thermal integrity. Among the designs examined, the down-round lip design offers superior cooling performance at lower coolant. These findings provide new insights into supersonic cutback film cooling and contribute to advancements in managing compressible flow for improved thermal protection.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108961"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838623","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}

{"title":"Thermoforming and springback suppression mechanism of laser assisted multi-point forming method","authors":"Xinfu Liu ,&nbsp;Yankuo Guo ,&nbsp;Feng Guo ,&nbsp;Yongjun Shi ,&nbsp;Yingshun Dong","doi":"10.1016/j.icheatmasstransfer.2025.108944","DOIUrl":"10.1016/j.icheatmasstransfer.2025.108944","url":null,"abstract":"<div><div>Multi-point forming (MPF) has unparalleled advantages in forming small-lot parts. However, the method has the disadvantage of large springback, which seriously affects the forming efficiency and accuracy. For this reason, a method of adding a laser into MPF (laser assisted MPF-LAMPF) is proposed. A numerical simulation model of LAMPF is established, and the forming and springback mechanisms of LAMPF are analyzed. In addition, the effects of different temperature values on the forming and springback of LAMPF are investigated. The results show that LAMPF can improve the forming value by 1.6 times and reduce the springback value by 67.3 % compared to the traditional MPF. The plastic zone of MPF is the load zone, and the springback zone is the transition zone and heat source zone. In contrast, the plastic zone of LAMPF is the load zone and heat source zone, and the springback zone is the transition zone. The laser has two roles in the LAMPF. One is that the heat generated by the laser can be directly involved in the plastic forming of the heat source zone so that the heat source zone is transformed from the elastic area to the plastic area. The other is that the laser heat lowers the yield strength threshold of the entire azimuthal section, which results in more elastic strain that can be easily converted into plastic strain. Further elevation of temperature can increase the forming value of LAMPF by a factor of 1.7 and suppress the springback value by 95.6 %. This is because elevating the temperature further expands the plastic strain area in the heat source and load zones and further compresses the elastic strain area in the transition zone. This method presents a new idea of thermally lowering the yield strength threshold to increase efficiency and reduce springback, which can provide a theoretical reference for the research of MPF in the field of thermoforming.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"164 ","pages":"Article 108944"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143838622","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}