International Journal of Thermal Sciences最新文献

{"title":"Experimental apparatus for radiation characteristics of semi-transparent materials at high temperature:A direct radiometric method","authors":"Yanfen Xu ,&nbsp;Kaihua Zhang ,&nbsp;Longfei Li ,&nbsp;Kun Yu ,&nbsp;Yufang Liu","doi":"10.1016/j.ijthermalsci.2025.109809","DOIUrl":"10.1016/j.ijthermalsci.2025.109809","url":null,"abstract":"<div><div>The accurate determination of radiation characteristics for semi-transparent materials is essential for the transmission of radiation energy and optical signals at high temperatures. However, distinguishing spontaneous, transmitted, and background radiation in the signals received by the detector poses significant challenges due to the inherent properties of semi-transparent materials. To address this, an experimental apparatus based on the direct radiometric method has been established, operating within a temperature range of 473–1473 K and a wavelength range of 3–12 μm. An integrated approach that employs an ancillary blackbody is introduced to simultaneously measure radiation characteristics of semi-transparent materials. The reliability of experimental equipment and method is evaluated through the measurement of radiation characteristics of silicon carbide and sapphire samples. Additionally, the variation of transmissivity, emissivity, and reflectivity of the sapphire sample is analyzed at various temperatures, exploring the trends of these parameters with respect to temperature and wavelength.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109809"},"PeriodicalIF":4.9,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474599","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":"Performances of approximate radiative property models for conditions met in ammonia combustion","authors":"Raghavendran Raman ,&nbsp;Jean-Louis Consalvi ,&nbsp;Stéphane Zaleski ,&nbsp;Guillaume Legros","doi":"10.1016/j.ijthermalsci.2025.109777","DOIUrl":"10.1016/j.ijthermalsci.2025.109777","url":null,"abstract":"<div><div>Recent investigations on ammonia as a sustainable fuel highlight the need for proper modelling of the radiative heat transfer in ammonia–air flames. As a result, the present work reports on spectral databases that have been specifically generated, leading to the development of various spectral models, ranging from narrow band models to global ones. These models have been tested against the exact line-by-line (LBL) model for an extended pressure range (1–50 atm) in both premixed and non-premixed flame configurations. Noticeably, the premixed flame structure, which can be represented by a two-layer system, is a challenging configuration for correlated-k distribution models. For this configuration, a detailed investigation of the spectral models on various flame fields led to the conclusion that in spite of a higher computational cost, the Statistical Narrow Band Correlated k-distribution (SNBCK) models are better suited for modelling the radiative processes compared to the full spectrum models, such as the Rank Correlated Full-Spectrum k-distribution (RCFSK), Multi-Scale Rank Correlated Full-Spectrum k-distribution (MSRCFSK), and Weighted Sum of Grey Gases (WSGG). Considering the computational load, a reduced SNBCK model, referred to as SNBCK25, was developed and demonstrated high agreement with the LBL model. As an illustration, for a spherically expanding premixed flame at 20 atm, the SNBCK model had a mean absolute relative error (MARE) of 1.17%, while the SNBCK25, RCFSK with double integration, MSRCFSK, and WSGG models resulted in MARE of 1.87%, 4.62%, 8.23%, and 34.7%, respectively, against the LBL model. It is worth mentioning that the contributions of <span><math><mi>NO</mi></math></span>, <span><math><msub><mrow><mi>NO</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>, and <span><math><mrow><msub><mrow><mi>N</mi></mrow><mrow><mn>2</mn></mrow></msub><mi>O</mi></mrow></math></span> were not significant to the evaluation of the divergence of radiative heat flux in the LBL model. Hence, these three species were ignored in the subsequent radiative computations.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109777"},"PeriodicalIF":4.9,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new hybrid CFD approach to study the impact of forced convection on radiant cooled wall with baseboard diffuser including various vane angles","authors":"Melek Caliskan Temiz ,&nbsp;Aykut Bacak ,&nbsp;Muhammet Camci ,&nbsp;Yakup Karakoyun ,&nbsp;Ozgen Acikgoz ,&nbsp;Ahmet Selim Dalkilic","doi":"10.1016/j.ijthermalsci.2025.109804","DOIUrl":"10.1016/j.ijthermalsci.2025.109804","url":null,"abstract":"<div><div>The current work examines the effect of forced convection on thermal comfort in a space, including radiant wall cooling and an innovative floor-level diffuser system. It examines the impact of various vane angles on thermal comfort in room air conditioning at 15°, 30°, 45°, 60°, and 75°, and employs experimental data to confirm a hybrid 3D computational fluid dynamics (CFD) model. A new floor-level diffuser system delivers air at temperatures between 18 °C and 22 °C, with supply air velocities of 5 m/s and 10 m/s measured at the exit side of diffuser while the supply water temperature is kept constant at 14 °C. In the hybrid 3D solution, experimentally derived convective heat transfer coefficients (CHTCs) for forced airflow are utilized. This is accomplished by merging a k-ω model with a hydronic radiant panel system that incorporates forced convection. The analysis examines temperature and velocity distributions, CHTCs on the radiant-cooled wall, and the PMV-PPD components. Results indicate that at a supply air velocity of 5 m/s, thermal comfort parameters do not satisfy PMV and PPD indices, except in proximity to the diffuser. Nevertheless, elevating the supply air velocity to 10 m/s ensures thermal comfort across the space, with the exception of regions next to the cooled wall surfaces. The examination of several vane angles indicated that a 45° angle yields the most advantageous thermal comfort conditions, irrespective of air velocity. The CHTC adjacent to the radiant wall is roughly 6 W/m²K at a velocity of 5 m/s and rises to 8 W/m²K at 10 m/s. The temperature disparity between the head and ankle regions at 5 m/s adheres to the 3 °C tolerance established by international standards. The study determines that a 45° vane angle ensures best thermal comfort, and the devised numerical method yields significant insights for the construction of analogous indoor settings.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109804"},"PeriodicalIF":4.9,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474601","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":"Optimizing pool boiling heat transfer with laser-engineered microchannels: Experimental and RSM modeling analysis","authors":"Ahmed A. Al-Nagdy ,&nbsp;Mohamed I.A. Habba ,&nbsp;Reda A. Khalaf-Allah ,&nbsp;Salwa M. Mohamed ,&nbsp;Mohamed T. Tolan ,&nbsp;Ammar S. Easa","doi":"10.1016/j.ijthermalsci.2025.109806","DOIUrl":"10.1016/j.ijthermalsci.2025.109806","url":null,"abstract":"<div><div>This study investigates the Pool Boiling Heat Transfer (PBHT) characteristics of distilled water using modified stainless steel surfaces with laser-processed microchannels. An experimental setup was designed and verified to conduct tests at atmospheric pressure across various heat fluxes ranging from 10 to 150 kW/m² in the nucleate PBHT regime. The microchannel surfaces, which were created using laser technology, had widths between 200 μm and 1000 μm. The experimental results demonstrated a substantial improvement in the Heat Transfer Coefficient (HTC) compared to polished surfaces, with narrow microchannels showing greater enhancement. Specifically, the enhancement ratios of the HTC were 94.3 %, 66.3 %, 44.5 %, 28.5 %, and 21.7 % at microchannel widths of 200, 400, 600, 800, and 1000 μm, respectively, at the highest heat flux. The study employed Response Surface Methodology (RSM) to optimize the PBHT system variables, aiming to achieve an optimal HTC. The quadratic model developed using RSM revealed significant interactions between the variables, with an R² value of 0.9981 for HTC, indicating a high degree of fit. The RSM analysis highlighted that smaller microchannel widths and higher heat fluxes significantly enhance the heat transfer performance, with the model predictions closely aligning with the experimental data. The optimal conditions predicted by RSM were a microchannel width of 217 μm and a heat flux of 146 kW/m², resulting in an HTC of 43.93 kW/m²K and an ΔT of 3.27 °C. This study underscores the effectiveness of RSM in optimizing complex heat transfer processes, offering valuable insights for enhancing PBHT performance through surface modification.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109806"},"PeriodicalIF":4.9,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471621","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 evaluation of surface roughness impact on thermal efficiency in electronic cooling systems: A comparative study of jet vs. spray cooling techniques","authors":"Moein Hoseinpour ,&nbsp;Mohammad Jamshidi ,&nbsp;Fatemeh Zahra Ghasemi ,&nbsp;Hamid Niazmand ,&nbsp;Mohammad Passandideh-Fard ,&nbsp;Mohammad Sardarabadi ,&nbsp;Amir Behzadi Moghaddam","doi":"10.1016/j.ijthermalsci.2025.109795","DOIUrl":"10.1016/j.ijthermalsci.2025.109795","url":null,"abstract":"<div><div>This study introduces a novel experimental approach to evaluate the impact of surface roughness and wettability (hydrophilicity and hydrophobicity) on the thermal performance of jet and spray cooling systems, focusing on electronic cooling applications under single-phase flow condition. Unlike previous research, which primarily emphasized fluid dynamics or system configurations, this work integrates advanced surface characterization techniques (using AFM and contact angle analysis) with the optimization of system parameters (nozzle diameter, flow rate, and heat flux) via the Taguchi method. Hydrophobic surfaces are created using Rust-oleum spray coating, while hydrophilic surfaces are treated with FeCl₃ solution. The cooling system employed four suction pipes near the surface to ensure proper fluid distribution and outflow. Experimental optimization using the Taguchi method revealed that, in jet cooling mode, increasing the nozzle diameter and fluid flow rate while reducing the nozzle height from the surface significantly improved cooling performance. Variance analysis indicated that fluid flow rate had the highest contribution to performance, accounting for 37.74 %. Spray cooling demonstrated superior efficiency, reducing surface temperature by up to 4K at high heat fluxes, owing to improved surface coverage and enhanced fluid-surface contact. Hydrophilic surfaces further enhanced heat transfer, achieving a reduction in surface temperature by about 2K, particularly under spray cooling. In contrast, hydrophobic surfaces decrease the convective heat transfer coefficient near to 50%, primarily due to reduced surface-fluid contact area and increased fluid sliding effects.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109795"},"PeriodicalIF":4.9,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471682","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":"Natural convection in a hemispherical soap bubble","authors":"M.Y. Alvarez-Jimenez ,&nbsp;J.M. Olvera-Orozco ,&nbsp;R.D. Rivas-Lozada ,&nbsp;R.E. Gonzalez-Narvaez ,&nbsp;A. Figueroa","doi":"10.1016/j.ijthermalsci.2025.109799","DOIUrl":"10.1016/j.ijthermalsci.2025.109799","url":null,"abstract":"<div><div>An experimental, numerical and theoretical study for the thermal convection in a hemispherical soap bubble is presented. The bubble is heated at the equator promoting a temperature gradient with the polar region. Buoyancy forces induce thermal plumes at the equator that move towards the pole. This thermal convection cell was firstly addressed by Seychelles et al. (2008). Experimentally, the time-dependent flows were explored with a Prandtl number <span><math><mrow><mi>P</mi><mi>r</mi><mo>=</mo><mn>6</mn><mo>.</mo><mn>85</mn></mrow></math></span> and different temperature gradients, which resulted in Rayleigh numbers <span><math><mrow><mi>R</mi><mi>a</mi></mrow></math></span> ranging from <span><math><mrow><mn>4</mn><mo>.</mo><mn>4</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>4</mn></mrow></msup></mrow></math></span> to <span><math><mrow><mn>1</mn><mo>.</mo><mn>6</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>6</mn></mrow></msup></mrow></math></span>. Additionally, the thermal plumes tilt and reach smaller latitudes if the hemisphere rotates at constant angular speed. Two rotating angular velocities were explored, resulting in two Ekman numbers, namely, <span><math><mrow><mi>E</mi><mi>k</mi><mo>=</mo><mn>4</mn><mo>.</mo><mn>7</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup></mrow></math></span> and <span><math><mrow><mi>E</mi><mi>k</mi><mo>=</mo><mn>2</mn><mo>.</mo><mn>4</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup></mrow></math></span>. The flows on the curved surface of the soap bubble are time-dependent flows with Reynolds numbers <span><math><mrow><mi>R</mi><mi>e</mi></mrow></math></span> ranging from 270 to 380, denoting a laminar regime. Experimental results obtained through dye visualization, particle image velocimetry, and thermal imaging show that the number of initial thermal plumes at the equatorial region depends significantly on the Rayleigh number. These observations helped to develop a two-dimensional analytical solution of the phenomenon. The analytical solution reproduces qualitatively various aspects of the flow. To the best knowledge of the authors, this is the first time an analytical solution of the phenomenon under study is reported. A full three-dimensional numerical simulation validates the analytical solution. Additionally, the numerical results agree with the experimental observations.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109799"},"PeriodicalIF":4.9,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474591","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 study on dynamics and freezing characteristics of droplet impact on supercooled surfaces","authors":"Bo-Jian Wei ,&nbsp;Lian-Kai Shi ,&nbsp;Shu-Rong Gao ,&nbsp;Shi-Hua Shi ,&nbsp;Zhe Liu ,&nbsp;Yi-Feng Wang ,&nbsp;Yan-Ru Yang ,&nbsp;Xiao-Dong Wang","doi":"10.1016/j.ijthermalsci.2025.109811","DOIUrl":"10.1016/j.ijthermalsci.2025.109811","url":null,"abstract":"<div><div>Droplet impact freezing is a natural phenomenon that significantly affects infrastructure and human activities. Despite extensive research on the effects of various parameters on droplet impact and freezing processes, there remains a lack of comparative analysis regarding the degree of influence of these parameters on the impact process, as well as insufficient thermodynamic analyses of the freezing process. This paper experimentally compares the effects of droplet sizes (2.28 mm–3.10 mm), Weber numbers (15–35), and surface temperatures (−30 °C–20 °C) on impact dynamics, including maximum spreading factor and receding ratio, on hydrophilic and superhydrophobic surfaces. The results show that on hydrophilic surfaces, the maximum spreading factor of droplets is significantly influenced by both the Weber number and surface temperature, while on superhydrophobic surfaces, the Weber number plays the primary role. Moreover, the maximum spreading factor and receding ratio of droplets on hydrophilic surfaces are notably higher than those on superhydrophobic surfaces, suggesting a faster heat exchange rate on hydrophilic surfaces. To deepen the understanding of the freezing process and the impact of related parameters on freezing time, particularly the evolution of the freezing front over time, we solved the heat conduction equations for various materials under appropriate boundary conditions. Our analysis determined that the freezing thickness scales with the square root of freezing time. Based on these findings, we propose a model to predict the freezing time of finite-thickness ice sheets. The predictions of our model align well with our experimental data and findings from other researchers, which validates its accuracy.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109811"},"PeriodicalIF":4.9,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465227","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":"Flow and heat transfer characteristics of liquid metal nanofluid in microchannel","authors":"Haiyi Du,&nbsp;Ronghua Zhu,&nbsp;Juan Shi,&nbsp;Zhenqian Chen","doi":"10.1016/j.ijthermalsci.2025.109787","DOIUrl":"10.1016/j.ijthermalsci.2025.109787","url":null,"abstract":"<div><div>With the development of miniaturization and integration, electronic equipment needs to address efficient thermal management under high heat flow. Microchannel has broad application prospects in microelectronic device cooling. Further improving the heat transfer performance of heat sink and reducing pump power consumption has been an enduring topic. In this study, the liquid metal nanofluid (LMNF) microchannel cooling technology is proposed. The influence mechanism of LMNF parameter and microchannel structure on flow and heat transfer performance are studied through the simulations and experiments. The working fluid consists of Ga₆₇In_20.5Sn_12.5 and copper nanoparticle (NP). Comprehensive performance of rectangular and wavy microchannel is analyzed in comparison. The results indicate that LMNF shows excellent heat transfer performance. The volume fraction of NP is the key parameter affecting heat transfer performance. Combined with the economic analysis, adding 1 ∼ 5 vol% NPs into the LM is more preferable. Moreover, the Raccoon structure with 0.05 mm amplitude performs superior heat transfer performance when the wavelength is set as 2.5 mm or 5 mm. In this study, the preferred parameters of working fluid and microchannel geometry are proposed, meanwhile the heat transfer correlation is fitted, which provides a theoretical guidance for optimizing micro heat sink.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109787"},"PeriodicalIF":4.9,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454284","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":"Decoupling study on IGBT stress performance based on thermal-mechanical-electromagnetic multiphysics analysis","authors":"Lin Xiang,&nbsp;Liang Wang,&nbsp;Zhaowen Wang,&nbsp;Xiaojie Li,&nbsp;Xing Wu,&nbsp;Shijun Dong","doi":"10.1016/j.ijthermalsci.2025.109793","DOIUrl":"10.1016/j.ijthermalsci.2025.109793","url":null,"abstract":"<div><div>The press-pack Insulated Gate Bipolar Transistor (IGBT) is a critical power device in high-power electronic equipment and widely employed in flexible direct current (DC) transmission systems. Electrothermal stress fatigue are the leading cause of IGBT failures in engineering applications. However, previous studies mainly focused on the stress analysis from individual mechanical field in IGBT, thus the coupling effects of thermal-mechanical-electromagnetic multiphysics fields on stress analysis are ignored, moreover, the thermal effect includes not only Joule heating but also electromagnetic losses, which lead to the interaction mechanisms on stress from various fields are currently unclear. In this paper, a novelty model of the IGBT considering mechanical field, thermal field, and electromagnetic field is proposed to comprehensively understand their inherent interaction mechanisms. Detailly, the paper explores the interaction mechanisms between fields by gradually coupling different fields. As a results, compared to the single mechanical field model, after thermal field is coupled into the mechanical field, the maximum stress steep rise to 26.2 MPa from 12.8 MPa. The electromagnetic field is further coupled into the mechanical-thermal fields, and the maximum temperature is increased by 6.2 %, which further leads to a 12.9 % increase in the maximum stress of mechanical field. The multiphysics coupling model has significantly narrowed the gap with the experimental results, the deviation in maximum stress has been reduced from 55.33 % in individual mechanical field to 2 % in Thermal-Mechanical-Electromagnetic multiphysics fields. The results indicate that the sequential coupling of thermal and electromagnetic fields significantly enhances the accuracy of stress analysis of IGBT.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109793"},"PeriodicalIF":4.9,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444768","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":"ANN-based optimization of disk-shaped microchannel heat exchanger for thermal and hydraulic performance improvement","authors":"Qi Jin ,&nbsp;Xuemei Chen ,&nbsp;Chaolei Yang ,&nbsp;Jun Bao ,&nbsp;Jiayi Zheng","doi":"10.1016/j.ijthermalsci.2025.109805","DOIUrl":"10.1016/j.ijthermalsci.2025.109805","url":null,"abstract":"<div><div>In thermal management systems, achieving uniform temperature distribution and minimizing pressure drop in microchannel heat exchangers remains a critical challenge. This study proposes an innovative disk-shaped microchannel heat exchanger with flow tunnel (DMHX-FT) to improve temperature uniformity and reduce pressure drop while maintaining efficient heat transfer. The DMHX-FT features a dendritic fractal microchannel layout to enhance turbulence and fluid flow equalization, along with hub-shaped flow tunnels for efficient recirculation. A feedforward backpropagation Artificial Neural Network (ANN) was employed to analyze parameter impacts and develop a predictive performance model, followed by a genetic algorithm to identify optimal solutions balancing pressure drop and temperature difference. The DMHX-FT achieves a 45 % reduction in temperature difference across various heat fluxes and a 75 % reduction in pressure drop compared to traditional designs. Experimental results align closely with numerical predictions, with discrepancies confined to a maximum of 10 %. The DMHX-FT effectively addresses key challenges in microchannel heat exchangers, offering a promising solution for advanced thermal management, supported by a robust ANN and genetic algorithm optimization framework.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"213 ","pages":"Article 109805"},"PeriodicalIF":4.9,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437630","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}