International Journal of Thermal Sciences最新文献

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Considering the double-layer topology of the cooling water diffusion expand in the domain and the performance analysis 考虑双层拓扑结构对冷却水扩散扩展域进行了性能分析
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-14 DOI: 10.1016/j.ijthermalsci.2025.110108
Hao Wang , Zhaohui Wang , Shousheng Hong , Quanjie Gao , Haonan Yang , Rongqing Bao
{"title":"Considering the double-layer topology of the cooling water diffusion expand in the domain and the performance analysis","authors":"Hao Wang ,&nbsp;Zhaohui Wang ,&nbsp;Shousheng Hong ,&nbsp;Quanjie Gao ,&nbsp;Haonan Yang ,&nbsp;Rongqing Bao","doi":"10.1016/j.ijthermalsci.2025.110108","DOIUrl":"10.1016/j.ijthermalsci.2025.110108","url":null,"abstract":"<div><div>In battery thermal management, the overall increase in temperature and local temperature variation of lithium batteries affect the safe use of batteries. In this study, a double-layer topology flow channel (DCP) cold plate is designed. The heat transfer rate and energy consumption were weighted as a multi-objective function, and the effects of the location of the internal condensate collection and diffusion ports as well as the number of outlets on the topology optimization were analyzed, with the location E and the number of quadruple outlets yielding the best symmetry and heat dissipation. On this basis, a new three-dimensional staggered-flow double-layer topological runner (DCP) cold plate model was developed and numerically simulated. The flow channel depth, inlet flow rate, and heat dissipation performance of different double-layer topology flow channel structures were investigated. The findings indicate that the optimal solution with the highest temperature and temperature difference can be obtained when the flow channel depth is 1 mm, the inlet flow volume per unit time is 3 g/s, and the discharge rate is 3C. As the Reynolds number rise, the DCP-E type shows extremely strong heat dissipation performance, and the maximum temperature was decreased by 3.5 °C. The thermal performance of rectangular channels (RCP), honeycomb channels (HCP) and single layer topology channels (STP) was compared at an equivalent volume fraction. The efficacy of heat dissipation of DCP-E is improved by 12.66 %, 16.77 %, and 3.58 % compared to RCP, HCP, and STP cold plates, respectively. The double-layer topology channel proposed in this paper provides new design ideas for battery thermal management research.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110108"},"PeriodicalIF":4.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614867","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
Cross-scale feature fusion with gradient-enhanced attention for accurate prediction of film cooling 跨尺度特征融合与梯度增强的关注,以准确预测膜冷却
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-14 DOI: 10.1016/j.ijthermalsci.2025.110147
Hongyu Gao, Yuying Liu, Yutian Wang, Yinuo Liu, Renjie Xu
{"title":"Cross-scale feature fusion with gradient-enhanced attention for accurate prediction of film cooling","authors":"Hongyu Gao,&nbsp;Yuying Liu,&nbsp;Yutian Wang,&nbsp;Yinuo Liu,&nbsp;Renjie Xu","doi":"10.1016/j.ijthermalsci.2025.110147","DOIUrl":"10.1016/j.ijthermalsci.2025.110147","url":null,"abstract":"<div><div>Accurate prediction of film cooling effectiveness is critical for optimizing gas turbine blade durability under extreme thermal conditions. This study proposes a novel deep learning framework integrating a gradient-enhanced attention mechanism with U-Net architecture to establish an end-to-end mapping from four key parameters (injection angle <span><math><mrow><mi>α</mi></mrow></math></span>, lateral expansion angle <span><math><mrow><mi>β</mi></mrow></math></span>, forward expansion angle <span><math><mrow><mi>γ</mi></mrow></math></span>, and blowing ratio <span><math><mrow><mi>M</mi></mrow></math></span>) to two-dimensional cooling effectiveness distributions. The UCGA model employs cross-scale feature fusion through adaptive pooling and a Sobel operator-based gradient attention module to enhance edge perception in flow field reconstruction. The model is based on 125 Computational Fluid Dynamics numerical simulations covering different geometrical parameter configurations. The validation demonstrates exceptional prediction accuracy (Coefficient of Determination (R<sup>2</sup>) &gt; 0.99, Structural Similarity Index Measure (SSIM) &gt; 0.97). SHapley Additive exPlanations (SHAP) analysis shows that <span><math><mrow><mi>β</mi></mrow></math></span> and <span><math><mrow><mi>M</mi></mrow></math></span> are the dominant parameters, with <span><math><mrow><mi>α</mi></mrow></math></span> and <span><math><mrow><mi>γ</mi></mrow></math></span> having a relatively small average effect on model predictions. This is consistent with the physical mechanisms controlling coolant coverage and momentum balance. This work provides valuable insights into the film cooling effectiveness distribution. Most importantly, the developed UCGA model is a very promising tool for fast, high-fidelity iterative optimization of the geometric parameters of the fan-shaped holes, with the aim of providing a reference for accelerating the design cycle.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110147"},"PeriodicalIF":4.9,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614868","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
Optimization design of integrated module for thermal management system in electric vehicle 电动汽车热管理系统集成模块优化设计
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-11 DOI: 10.1016/j.ijthermalsci.2025.110141
Weiwei Lu , Qingxia Yang , Zhongyue Zou , Liyou Xu , Jiguang Chen , Xiuqing Li
{"title":"Optimization design of integrated module for thermal management system in electric vehicle","authors":"Weiwei Lu ,&nbsp;Qingxia Yang ,&nbsp;Zhongyue Zou ,&nbsp;Liyou Xu ,&nbsp;Jiguang Chen ,&nbsp;Xiuqing Li","doi":"10.1016/j.ijthermalsci.2025.110141","DOIUrl":"10.1016/j.ijthermalsci.2025.110141","url":null,"abstract":"<div><div>The temperature control of vehicle is achieved through thermal management system, the design of which is critical to regulating vehicle temperature and reducing energy consumption. In this study, an integrated coolant circulation module was developed. The internal flow dynamics of the module were simulated using the computational fluid dynamics K-ε turbulence model. The research objective was to investigate the correlation between pressure drop and coolant flow in different operational modes. The results reveal a nonlinear positive correlation between pressure loss and coolant volumetric flow rate. Through structural optimization in regions of high pressure difference within the flow field, the average pressure loss within the module was reduced by 37 %. The accuracy of the simulation was confirmed by rapid prototype testing on a test bench, followed by in-vehicle verification of the prototype. These validations demonstrate that the module meets design standards and effectively controls vehicle temperature. The implementation of the integrated module reduced the number of coolant pipelines in the thermal management system from 23 to 10, significantly decreasing the number of pipes and interfaces and thereby lowering the risk of coolant leakage. Additionally, it resulted in a 15.64 % reduction in material costs and a 354-s reduction in installation labor time. These improvements can significantly lower the production cost of the thermal management system of electric vehicle.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110141"},"PeriodicalIF":4.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144595622","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
Rapid temperature prediction of parallel-connected generator circuit breaker busbar based on multi-input physical information neural network 基于多输入物理信息神经网络的并联发电机断路器母线温度快速预测
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-11 DOI: 10.1016/j.ijthermalsci.2025.110142
Yingzhuo Li , Lixue Chen , Yinghui He , Shengqin Xu , Yuesong Dong
{"title":"Rapid temperature prediction of parallel-connected generator circuit breaker busbar based on multi-input physical information neural network","authors":"Yingzhuo Li ,&nbsp;Lixue Chen ,&nbsp;Yinghui He ,&nbsp;Shengqin Xu ,&nbsp;Yuesong Dong","doi":"10.1016/j.ijthermalsci.2025.110142","DOIUrl":"10.1016/j.ijthermalsci.2025.110142","url":null,"abstract":"<div><div>The busbar is a component in the parallel-connected generator circuit breaker (GCB) that experiences severe heating. Real-time monitoring of the busbar's temperature field not only ensures that the GCB operates within normal temperature limits but also indirectly reflects the current sharing effect of the parallel-connected GCB. In this paper, an electromagnetic-thermal-fluid coupled model of the GCB is first established and compared with experimental results, with a maximum temperature difference of 2.0 K at the measuring points, demonstrating great agreement. Second, samples are generated using orthogonal design combined with finite element method (FEM). Further, A Multi-input Physics-informed Neural Network (MIPINNs) model is established, where the coordinate feature (CF) and temperature feature (TF) are respectively input into a deep multilayer perceptron (MLP) and a shallow MLP to prevent overfitting and underfitting, and physical information loss is incorporated into the network's loss function as a regularization method. This approach successfully predicts the three-dimensional temperature field of the GCB's busbar with limited sample, yielding better prediction results compared to traditional data-driven models. The <em>MAPE</em> and <em>RMSE</em> of test set are 0.32 % and 0.29 K, respectively, indicating minimal error. Moreover, MIPINNs achieves a prediction time of 0.643s, significantly faster than FEM's 4864s. Besides, the prediction capability of MIPINNs under extreme working conditions is tested, the maximum temperature prediction error is 3.7 K, with a relative error of 2.87 %, indicating that MIPINNs possesses strong generalization capability. In addition, the contact temperature is indirectly calculated using temperature sensors in the MIPINNs model.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110142"},"PeriodicalIF":4.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144595623","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
Calibration of scanning thermal microscopes using optimal estimation of function parameters by iterated linearization 用迭代线性化方法最优估计函数参数校准扫描热显微镜
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-10 DOI: 10.1016/j.ijthermalsci.2025.110080
Anna Charvátová Campbell , Petr Klapetek , Radek Šlesinger , Jan Martinek , Václav Hortvík , Viktor Witkovský , Gejza Wimmer
{"title":"Calibration of scanning thermal microscopes using optimal estimation of function parameters by iterated linearization","authors":"Anna Charvátová Campbell ,&nbsp;Petr Klapetek ,&nbsp;Radek Šlesinger ,&nbsp;Jan Martinek ,&nbsp;Václav Hortvík ,&nbsp;Viktor Witkovský ,&nbsp;Gejza Wimmer","doi":"10.1016/j.ijthermalsci.2025.110080","DOIUrl":"10.1016/j.ijthermalsci.2025.110080","url":null,"abstract":"<div><div>Scanning thermal microscopy is a unique tool for the study of thermal properties at the nanoscale. However, calibration of the method is a crucial problem. When analyzing local thermal conductivity, direct calibration is not possible and reference samples are used instead. As the calibration dependence is non-linear and there are only a few calibration points, this represents a metrological challenge that needs complex data processing. In this contribution we present use of the OEFPIL algorithm for robust and single-step evaluation of local thermal conductivities and their uncertainties, simplifying this procedure. Furthermore, we test the suitability of SThM calibration for automated measurement.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110080"},"PeriodicalIF":4.9,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589284","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
Stability analysis of falling liquid film over a heterogeneously heated slippery substrate 液体膜在非均匀加热光滑基底上的稳定性分析
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-10 DOI: 10.1016/j.ijthermalsci.2025.110104
Anandamoy Mukhopadhyay , Akshay Desai
{"title":"Stability analysis of falling liquid film over a heterogeneously heated slippery substrate","authors":"Anandamoy Mukhopadhyay ,&nbsp;Akshay Desai","doi":"10.1016/j.ijthermalsci.2025.110104","DOIUrl":"10.1016/j.ijthermalsci.2025.110104","url":null,"abstract":"<div><div>We investigate gravity-driven, Newtonian thin liquid film flow along a heterogeneously heated slippery rigid substrate. Using Benney’s long-wave asymptotic expansion technique (LWE) a free surface evolution equation is constructed. In case of locally heated Gaussian temperature distribution, simulation of the basic flow shows that the increment of thickness of the film for the primary flow in case of variation of the film Marangoni number (<span><math><mi>M</mi></math></span>) is significant with comparison to the dimensionless slip length (<span><math><mi>β</mi></math></span>). For uniform temperature distribution the linear study confirms that the destabilizing behavior of the slip length (<span><math><mi>β</mi></math></span>) is dominant than that of the destabilizing behavior of the film Marangoni number (<span><math><mi>M</mi></math></span>); Biot number plays a double role. There exists a critical value of Biot number <span><math><mrow><mo>(</mo><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>)</mo></mrow></math></span>; below this value it exhibits stabilizing effect, but above it, it becomes destabilizing. As the LWE is valid only near the critical point and has the finite time blow up property of the solution, we employed weighted residual method (WRM) for better understanding of the critical condition with the variation of the slip length. For uniform temperature distribution the onset of instability <span><math><mrow><mo>(</mo><mi>R</mi><msub><mrow><mi>e</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>)</mo></mrow></math></span> obtained by WRM is exactly same to that obtained by Orr–Sommerfeld/LWE method, in case of small as well as moderate values of the slip length (<span><math><mi>β</mi></math></span>). Further, using Fourier spectral method of the coupled system in terms of film thickness <span><math><mrow><mi>h</mi><mrow><mo>(</mo><mi>x</mi><mo>,</mo><mi>t</mi><mo>)</mo></mrow></mrow></math></span> and flow rate <span><math><mrow><mi>q</mi><mrow><mo>(</mo><mi>x</mi><mo>,</mo><mi>t</mi><mo>)</mo></mrow><mo>,</mo></mrow></math></span> the temporal as well as the spatial evolution, in case of locally heated Gaussian temperature distribution, confirms the destabilizing behavior of both <span><math><mi>M</mi></math></span> and <span><math><mi>β</mi></math></span>. Numerical simulation of the Benney type evolution equation, for the locally heated Gaussian temperature profile, reveals the destabilizing behavior of M, <span><math><mi>β</mi></math></span>. The dual role of Biot number is missing, it only exhibits stabilizing effect.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110104"},"PeriodicalIF":4.9,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589285","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
Comparative analysis of phase-change coolants on heat and mass transfer characteristics in nose cone transpiration cooling 相变冷却剂对鼻锥蒸腾冷却传热传质特性的比较分析
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-09 DOI: 10.1016/j.ijthermalsci.2025.110129
Jia-Cheng Wan, Shen Du, Dong Li, Ya-Ling He
{"title":"Comparative analysis of phase-change coolants on heat and mass transfer characteristics in nose cone transpiration cooling","authors":"Jia-Cheng Wan,&nbsp;Shen Du,&nbsp;Dong Li,&nbsp;Ya-Ling He","doi":"10.1016/j.ijthermalsci.2025.110129","DOIUrl":"10.1016/j.ijthermalsci.2025.110129","url":null,"abstract":"<div><div>Phase-change transpiration cooling technology presents significant potential for hypersonic thermal protection. Extensive investigations of water-based transpiration cooling systems have shown their susceptibility to instability under certain operating conditions. Therefore, there is an urgent need to conduct comparative studies of alternative coolants for nose cone transpiration cooling. In this study, a mathematical model coupling the finite-rate chemical reaction external field with the two-phase mixed porous internal field is constructed, using the partitioned modeling technique and interface coupling algorithm. Simulations under different Mach numbers and static pressures reveal the heat and mass transfer characteristics between ethanol and water coolant. The results show that the thermodynamic and transport properties of the working fluids significantly affect the bow shock, the injected thermal barrier layer, and the distribution of the energy and flow fields inside the nose cone. Under high Mach number conditions, ethanol proves ineffective in mitigating the extreme aerodynamic heat load, leading to heat transfer deterioration in the stagnation region. In contrast, under low heat load conditions, ethanol exhibits better flow and heat transfer synergy, with a 45 % improvement in the uniformity of mass injection distribution. These findings provide a valuable reference for the selection of coolant in nose cone transpiration cooling systems.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110129"},"PeriodicalIF":4.9,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581055","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
Computational study of microwave-driven drug delivery with realistic tumor modeling and optimized heating protocols for hepatocellular carcinoma 基于真实肿瘤模型和优化加热方案的微波驱动给药肝细胞癌的计算研究
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-09 DOI: 10.1016/j.ijthermalsci.2025.110140
Gabriele Adabbo , Assunta Andreozzi , Marcello Iasiello , Paolo Antonio Netti
{"title":"Computational study of microwave-driven drug delivery with realistic tumor modeling and optimized heating protocols for hepatocellular carcinoma","authors":"Gabriele Adabbo ,&nbsp;Assunta Andreozzi ,&nbsp;Marcello Iasiello ,&nbsp;Paolo Antonio Netti","doi":"10.1016/j.ijthermalsci.2025.110140","DOIUrl":"10.1016/j.ijthermalsci.2025.110140","url":null,"abstract":"<div><div>Hepatocellular carcinoma (HCC), the most prevalent form of liver cancer, remains one of the top contributors to cancer-related mortality worldwide. Existing treatments like chemotherapy and thermal ablation face critical limitations, including suboptimal tumor coverage and high systemic toxicity. This study introduces a numerical approach to investigate the combined effects of pulsed microwave hyperthermia and thermosensitive liposomal (TSL) drug delivery. A 3D computational model was developed based on segmented CT imaging to replicate realistic liver tumor anatomy. The model simulates both spatial and temporal variations in drug diffusion, incorporating temperature and tissue damage-dependent parameters. Results indicate that pulsed hyperthermia enhances intracellular doxorubicin levels by 50.4 % (from 0.387 to 0.582 mol m<sup>−3</sup>) compared to traditional chemotherapy. Additionally, pulsed heating significantly reduces thermally ablated tumor volume (from 35.5 % to 18.6 %) relative to continuous heating. The use of anatomically accurate geometry allows for a more detailed analysis of how tumor and tissue shape irregularities influence therapeutic outcomes and temperature field diffusion. These results emphasize the potential for integrating targeted drug carriers and localized heating in advancing personalized treatment for liver cancer.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110140"},"PeriodicalIF":4.9,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589281","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
Optimizing thermal insulation in footwear: A numerical simulation approach with CAD modeling 鞋履隔热优化:CAD建模的数值模拟方法
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-08 DOI: 10.1016/j.ijthermalsci.2025.110110
Eleonora Bianca, Antonio Buffo, Marco Vanni, Ada Ferri
{"title":"Optimizing thermal insulation in footwear: A numerical simulation approach with CAD modeling","authors":"Eleonora Bianca,&nbsp;Antonio Buffo,&nbsp;Marco Vanni,&nbsp;Ada Ferri","doi":"10.1016/j.ijthermalsci.2025.110110","DOIUrl":"10.1016/j.ijthermalsci.2025.110110","url":null,"abstract":"<div><div>This study addresses the challenge of evaluating the thermal insulation of technical footwear designed for cold environments. The aim is to develop a calculation tool to predict the thermal resistance (R<span><math><msub><mrow></mrow><mrow><mi>c</mi><mi>T</mi></mrow></msub></math></span>, in m<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>K/W) of new footwear models before prototypes are manufactured. The model assumes stationary heat transfer and solves the relevant energy balance equations using a finite volume approach that takes into account the heterogeneous thermal properties of footwear components. Two simulation campaigns were carried out. In the first, tests with human subjects were simulated, where the boundary conditions included a prescribed internal heat flux (60 W/m<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>), a fixed ground contact temperature (-17 °C), and convective heat transfer to the outer surface. The second set of simulations mimicked manikin tests (UNI EN ISO 15831:2004), using fixed temperatures at the foot–shoe interface and on the floor (10 °C) and external convection. Validation with experimental data showed good agreement, underpinning the model’s ability to assess insulation performance under controlled conditions. Further simulations investigated the effects of different environmental parameters (temperature, wind speed, and ground contact) on heat loss. Statistical analysis revealed that ambient temperature had the greatest influence, explaining 37% of the total variance in heat flux, followed by ground type (22%) and wind speed (13%). This tool not only enables early assessment of thermal insulation in unbuilt prototypes, reducing reliance on time-consuming laboratory testing, but also supports detailed thermal diagnostics. It facilitates zone-specific optimization by changing the material composition and boot construction, promoting targeted design improvements under realistic operating conditions.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110110"},"PeriodicalIF":4.9,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572930","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 analysis of heat sink configurations and their impact on conjugate heat transfer in manifold systems 流形系统中散热器构型的数值分析及其对共轭传热的影响
IF 4.9 2区 工程技术
International Journal of Thermal Sciences Pub Date : 2025-07-08 DOI: 10.1016/j.ijthermalsci.2025.110145
Yuan Ma , Rasul Mohebbi , Zhigang Yang , Mikhail A. Sheremet
{"title":"Numerical analysis of heat sink configurations and their impact on conjugate heat transfer in manifold systems","authors":"Yuan Ma ,&nbsp;Rasul Mohebbi ,&nbsp;Zhigang Yang ,&nbsp;Mikhail A. Sheremet","doi":"10.1016/j.ijthermalsci.2025.110145","DOIUrl":"10.1016/j.ijthermalsci.2025.110145","url":null,"abstract":"<div><div>This study numerically analyzes the impact of heat sink designs, inlet fluid velocity, and heat flux on fluid flow and conjugate heat transport parameters. Four thermal sink configurations are examined: Type A, a conventional rectangular design serving as the baseline; Type B, featuring rectangular cavities on the walls; Type C, incorporating asymmetric triangular and trapezoidal cavities; and Type D, consisting of interconnected pin-like structures. The findings reveal that Type A creates large circulation zones, which limit heat transfer performance. In contrast, the modified designs (Types B, C, and D) significantly enhance conjugate heat transfer efficiency. At constant inlet velocity, increasing heat flux (<em>Q</em>) amplifies the performance differences among the heat sink types. Conversely, at constant heat flux, increasing inlet velocity diminishes these differences. At low inlet velocities, the average temperature (<em>T</em><sub><em>avg</em></sub>) of Types B, C, and D is similar, with Type D achieving the lowest temperature non-uniformity (δ<em>T</em>). At higher inlet velocities, Type B exhibits the best conjugate heat transfer performance, followed by Types C, D, and A. These results underscore the importance of optimized heat sink geometries and flow conditions for improved thermal performance.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"218 ","pages":"Article 110145"},"PeriodicalIF":4.9,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144581054","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
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