International Journal of Thermal Sciences最新文献

{"title":"Research on thermal management structural design and whole-lifespan temperature control characteristics for high-power energy storage battery systems","authors":"Yingjie Pang ,&nbsp;Yan Wang ,&nbsp;Jinyi Liu ,&nbsp;Ziyang Zhang ,&nbsp;Yalun Li ,&nbsp;Chengshan Xu ,&nbsp;Bin Yang ,&nbsp;Jiancheng Guo","doi":"10.1016/j.ijthermalsci.2025.110631","DOIUrl":"10.1016/j.ijthermalsci.2025.110631","url":null,"abstract":"<div><div>Electrochemical energy storage systems (EESS) participate in power system frequency modulation (FM), with frequent charge-discharge cycles and high operating power. These characteristics-induced issues, including degraded system thermal properties and intensified inconsistency, require in-depth research, posing dual challenges to temperature uniformity management and aging-related thermal management. Thus, this paper carries out the following research efforts. First, six heat dissipation configurations are proposed by increasing heat transfer area and boosting heat transfer coefficient. Eventually, the air-liquid dual-circulation heat dissipation configuration G is optimized and selected. Second, based on orthogonal simulations, the impact characteristics of temperature-control boundaries and parameter sensitivity are analyzed, obtaining the significance ranking of three factors (inlet temperature A, inlet flow rate B, fan speed C) for maximum temperature and maximum temperature difference. Finally, temperature control effectiveness analysis is performed on 15 aging grouping schemes with non-uniform State of Health (SOH) distribution, identifying modules that meet the requirements (maximum temperature &lt;35 °C, maximum temperature difference &lt;5 °C) throughout the full lifespan. The findings indicate that configuration g expands the heat transfer area by nearly twofold and boosts the heat transfer coefficient by around sixfold relative to configuration A. During 2p discharge, configuration G achieves a maximum temperature difference of 2.32 °C, representing a 25.40 % improvement over configuration A. Under configuration G, the factors influencing maximum temperature and maximum temperature difference follow the same significance ranking: inlet temperature A &gt; inlet flow rate B &gt; fan speed C. In addition, among the modules meeting temperature control effectiveness requirements throughout the full lifespan, module Ⅲ-A has the highest temperature of 32.31 °C. Module Ⅲ-C has the largest temperature difference of 4.27 °C. For modules meeting the temperature control requirements, the maximum aging degree reaches SOH = 90 %, with a maximum aging difference of 10 %. The results of this study provide design references and a theoretical basis for EESS participating in power system FM, laying a foundation for their promotion and application.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110631"},"PeriodicalIF":5.0,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881209","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 numerical study on an innovative multi-branched inner tube design for double-pipe heat exchangers in high-efficiency renewable energy application","authors":"Joffin Jose Ponnore ,&nbsp;Hazim Moria","doi":"10.1016/j.ijthermalsci.2025.110647","DOIUrl":"10.1016/j.ijthermalsci.2025.110647","url":null,"abstract":"<div><div>Double-pipe heat exchangers have wide applications in renewable energy systems such as solar thermal collectors, geothermal heat loops, and biomass-based energy recovery units. This work presents a novel and pioneering double-pipe heat exchanger featuring an innovative branched inner tube design (see the graphical abstract), which represents a significant departure from conventional configurations and introduces a new paradigm in passive heat transfer enhancement. This unique design simultaneously increases the effective heat transfer surface area and enhances fluid turbulence and mixing, thereby significantly improving thermal performance. To thoroughly assess this design's impact, comprehensive numerical simulations were conducted using a validated finite volume method under turbulent flow conditions. These simulations investigated the dynamic interaction between flow velocities in both the inner and outer tubes, comparing scenarios where the inner tube flow velocity was either higher or lower. Results consistently demonstrate that the multi-branched configuration achieves greater temperature differences and superior overall effectiveness when contrasted with conventional straight-tube designs, particularly in counter-flow arrangements. For instance, the multi-branched setup led to an increase in outlet temperature of up to 7.8 °C in counter-flow at an inner inlet velocity of 0.16 m/s, corresponding to a thermal performance enhancement of approximately 40 % compared to the baseline straight-tube design. While increasing inner tube velocity generally improved the Nusselt number, it also resulted in a more pronounced pressure drop within the multi-branched design. Nevertheless, the multi-branched heat exchanger consistently exhibited substantially higher effectiveness across all velocities and flow patterns. For instance, at 0.16 m/s, the multi-branched design achieved effectiveness values of 0.20 (parallel) and 0.277 (counter), marking improvements of 43 % and 42 % over the straight design's 0.14 and 0.195, respectively. These findings conclusively demonstrate that the proposed multi-branched architecture offers a highly effective, compact, and passive solution for boosting thermal efficiency in renewable energy systems, addressing a critical need for high-performance heat exchangers in space-constrained sustainable applications.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110647"},"PeriodicalIF":5.0,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881180","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":"Research on transient temperature field in hot dry rock drilling based on multi medium coupled heat transfer","authors":"Maoyuan Ma ,&nbsp;Liangjie Mao ,&nbsp;Xueyin Han ,&nbsp;Jian Zhou ,&nbsp;Denghuang Fu ,&nbsp;Linping Zhang","doi":"10.1016/j.ijthermalsci.2025.110630","DOIUrl":"10.1016/j.ijthermalsci.2025.110630","url":null,"abstract":"<div><div>High temperature in the wellbore is the main difficulty in hot dry rock (HDR) drilling. Accurate prediction of the wellbore temperature field during HDR drilling is critical for drilling design optimization and operational safety. However, current research on HDR predominantly focuses on improving thermal extraction efficiency, with limited attention to wellbore temperature during drilling. This study innovatively establishes a transient heat transfer model for HDR drilling with the thermal-fluid-solid coupling, incorporating variations in mud thermophysical properties and the dynamic process of heat generation by the bit friction, and the refined temperature simulation of the drillstring-casing-formation is achieved based on the actual engineering parameters. The results show that the thermal conductivity and specific heat capacity of mud at the bottom hole increased by 29.1 % and 47.2 % respectively, and the temperature of the bit is more than 40 °C higher than the annular mud during HDR drilling. Which also indicates that the assumption of traditional constant parameters is completely inapplicable to the wellbore temperature field prediction in HDR drilling. Then, an HDR well in Qinghai, China, as a case study, the effects of rotary speed, weight on bit (WOB), mud flow rate, mud system, horizontal section length, and mud injection temperature on wellbore temperature field are analyzed, and suggestions for drilling optimization are provided. We hope this helps to optimize drilling schemes and reduce accidents in HDR drilling.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110630"},"PeriodicalIF":5.0,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881319","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":"Determination of physical and thermal properties of nano silica core - based VIPs using experimental and RSM methods, optimization of unit costs","authors":"Ali Ekrem Akdağ ,&nbsp;Murat Koru ,&nbsp;Nuri Işıldar ,&nbsp;Hilmi Cenk Bayrakçı ,&nbsp;Metin Davraz","doi":"10.1016/j.ijthermalsci.2025.110595","DOIUrl":"10.1016/j.ijthermalsci.2025.110595","url":null,"abstract":"<div><div>In building applications, growing energy conservation goals have increased the demand for high-performance thermal insulation materials. The main objective of this study was to develop and optimize high-performance vacuum insulation panels (VIPs) with reduced thermal conductivity through composition and density control. In this study, the thermal behavior of vacuum insulation panels (VIPs) containing fumed silica (FS) was investigated and optimized using experimental design and a Response Surface Methodology (RSM). A total of 32 VIP samples with different core compositions and densities were fabricated and characterized. The core mixtures consisted of FS, glass fiber (GF), and silicon carbide (SiC), combined in various proportions and compacted under controlled compression forces. The cores were vacuum sealed below 1 Pa using a seven-layer metallized ALUPET barrier film to ensure long-term vacuum stability. Subsequently, the VIPs were fabricated by vacuum sealing the cores, and their thermal conductivities were experimentally measured to validate the proposed design approach.</div><div>The effects of FS, GF, SiC, and density (D) on thermal resistance (R) were modeled and statistically evaluated using a combined mixture–process design. Statistical analysis confirmed the significance of the model (p &lt; 0.001), showing a strong correlation between the predicted and experimental results (R² = 0.958, adjusted R² = 0.944, predicted R² = 0.890). Increasing density significantly reduced R, while higher FS and SiC contents improved the overall insulation capability. GF primarily contributed to enhancing the structural integrity of the panels.</div><div>A cost analysis based on current raw material prices revealed that panels with balanced FS-GF-SiC ratios achieved competitive unit costs of approximately 40–45 $·m⁻², indicating that high insulation efficiency can be achieved without substantial cost increase. The VIP produced with 80 % FS, 10 % SiC, and 10 % GF under a compression force of 14 kN showed the lowest thermal conductivity (0.00394 W·m^⁻¹·K^⁻¹) and the highest R (7.65 m^²·K·W^⁻¹. This configuration represents an optimal balance between thermal performance and economic feasibility, demonstrating the practical potential of the proposed design.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110595"},"PeriodicalIF":5.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881215","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":"Study on steady-state temperature field distribution of spur gear considering angular misalignment error","authors":"Peng Dong ,&nbsp;Desheng Zou ,&nbsp;Chang Xiong ,&nbsp;Shumiao Zuo ,&nbsp;Junbin Lai ,&nbsp;Xiangyang Xu ,&nbsp;Shuhan Wang ,&nbsp;Yanfang Liu","doi":"10.1016/j.ijthermalsci.2025.110628","DOIUrl":"10.1016/j.ijthermalsci.2025.110628","url":null,"abstract":"<div><div>Angular misalignment error, a common defect arising from manufacturing and assembly processes in gear transmission systems, leads to non-uniform load distribution on tooth surfaces and consequently causes uneven steady-state temperature fields. To accurately and efficiently compute the tooth surface temperature distribution under angular misalignment error, this study proposes a novel computational method for determining the steady-state temperature field of gear teeth. The approach employs Loaded Tooth Contact Analysis (LTCA) to evaluate load distribution across tooth surfaces incorporating angular misalignment error. Subsequently, the transient friction coefficient of the tooth surface is calculated based on Thermo-Elastohydrodynamic Lubrication (TEHL) theory. Building upon this foundation, the meshing heat flux of the gear teeth is quantified, and the convective heat transfer coefficient of the tooth surface was determined. Based on thermal equilibrium theory, the steady-state temperature field of gears is subsequently obtained. Utilizing this model, a systematic analysis is carried out to investigate the effect of misalignment direction and magnitude on tooth surface load distribution, lubrication characteristics, and temperature field evolution. The results indicate that angular misalignment error in the <em>y</em>-direction exhibit significant sensitivity in both load distribution and lubrication-induced temperature variations. Finally, the validity of the proposed model was verified through finite element method (FEM) and experiment. This study provides theoretical support for elucidating the temperature field distribution characteristics of gears under angular misalignment error.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110628"},"PeriodicalIF":5.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881212","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":"Staggered counterflow rectangular microchannel liquid-cooled plate based on nanofluids for enhanced heat transfer performance","authors":"Zhengchao Yang ,&nbsp;Yu Wang ,&nbsp;Xiaolei Yuan ,&nbsp;Xiaotong Ding ,&nbsp;Guang Yang ,&nbsp;Xuejing Yang ,&nbsp;Qipeng Li","doi":"10.1016/j.ijthermalsci.2025.110651","DOIUrl":"10.1016/j.ijthermalsci.2025.110651","url":null,"abstract":"<div><div>This work innovatively proposes the integration of TiO₂/H₂O nanofluids with a staggered counter-flow rectangular microchannel liquid-cooled plate, establishing a synergistic cooling mechanism that enhances heat transfer efficiency while minimizing flow resistance. Numerical simulations and experiments were conducted to systematically evaluate the effects of nanoparticle type, volume concentration (1–5 vol%), inlet flow velocity (0.3–0.7 m/s), and initial temperature (31–39 °C) on the thermo-hydraulic performance of the cooling plate. Results indicate that among the nanofluids tested, TiO₂ achieved the most significant heat transfer enhancement, with its Nusselt number (<em>Nu</em>) increasing by 16.6 % compared to pure water at 5 vol%. Although higher nanoparticle concentrations notably increased flow resistance, raising the inlet velocity improved heat transfer (up to 76.6 % <em>Nu</em> increase) at the expense of a higher-pressure drop. Using the Box-Behnken response surface methodology (RSM), optimal operating conditions (1 vol%, 0.511 m/s, 34.6 °C) were identified, yielding a 31.98 % increase in <em>Nu</em> under low flow resistance constraints. Experimental validation showed that at 0.6 m/s and 1 vol% TiO₂/H₂O nanofluid, the contact surface temperature was reduced by 4.89 % compared to pure water, with a maximum <em>Nu</em> improvement of 32.86 %. Furthermore, a new <em>Nu</em> correlation was proposed and validated against experimental data, model predictions, and results from published literature. These findings provide a practical and efficient cooling solution for high-power electronic devices with stringent thermal management requirements, offering valuable insights for both academic research and engineering applications.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110651"},"PeriodicalIF":5.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881181","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":"Simulating the full-scale compartment fire dynamics influenced by the initial single-glazing window and door opening conditions","authors":"Ting Xia ,&nbsp;Yu Wang","doi":"10.1016/j.ijthermalsci.2025.110624","DOIUrl":"10.1016/j.ijthermalsci.2025.110624","url":null,"abstract":"<div><div>In real building fires, ventilation may dramatically change due to the glass fallout and door opening. However, little is known about the interaction between the sudden ventilation change and compartment fire dynamics, especially the capacity of Computational Fluid Dynamics (CFD) tools to simulate this situation is still unknown. In this work, numerical simulations were conducted using Fire Dynamics Simulator (FDS) for two different opening conditions, namely door and window remained open, and door and window initially closed and changed gradually. The combustibles/furniture burnt in the experiments were tested for Thermogravimetric Analysis (TGA) and Differential Scanning Calorimeter analysis (DSC), to obtain pyrolysis and combustion characteristics for the Complex Pyrolysis Models of furniture used in simulation. The primary simulated fire dynamics were then captured and compared with the full-scale experimental results and estimated values based on experiments. It was established that FDS performed well in well-ventilated fires, but simulating fires with smoldering combustion and sudden ventilation changes in a compartment was challenging, resulting in faster fire development and spread with higher heat release rate than experimental results. Based on the numerical model validated by upper gas temperatures of Tests 1 and 2, the changes in temperature distribution, flow velocity and gas concentration for different fire stages and opening conditions were calculated and demonstrated. It was found that the sudden ventilation change, by glass fallout and door opening exacerbated combustion significantly and caused the recirculation zone to move towards the new opening, disrupting the stable recirculation zone. The results deepen the understanding of the compartment fire behaviour and flow field after sudden ventilation changes, and quantify the potential of CFD and real fire conditions with boundary conditions change resulting from window and doors.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110624"},"PeriodicalIF":5.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881185","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 of a flat grooved heat pipe with electrodeposited composite wick for thermal performance enhancement","authors":"Jia-Xi Lu,&nbsp;Yi-Tao Shen,&nbsp;Hua Chen,&nbsp;Wen-Long Cheng","doi":"10.1016/j.ijthermalsci.2025.110608","DOIUrl":"10.1016/j.ijthermalsci.2025.110608","url":null,"abstract":"<div><div>To enhance capillary and thermal performance in flat grooved heat pipes (FGHP) for electronics cooling, a composite wick combining electrodeposited copper forest with rectangular grooves (CF-FGHP) is proposed. Capillary rise and heat transfer experiments verified its superiority. Visualization experiments revealed the copper forest enhances nucleation and accelerates internal circulation during heating. Effects of electrodeposition area and time on temperature uniformity and heat transfer limit were studied. Results show CF-FGHP achieved a capillary performance parameter <span><math><mrow><mi>K</mi><mo>/</mo><msub><mi>r</mi><mtext>eff</mtext></msub></mrow></math></span> of 1.96 μm. During startup, it stabilized 66 s faster with a 5.9 °C lower evaporator temperature than FGHP. CF-FGHP#2 (electrodeposited area:25.0 × 37.5 mm²) achieved a total thermal resistance of 0.12 °C/W at 50 W, which is 63 % lower than the minimum total thermal resistance of FGHP. Optimizing electrodeposition time for CF-FGHP#2 produced CF-FGHP#2–250 (electrodeposited time:250 s), achieved a 70 W heat transfer limit and a total thermal resistance of 0.11 °C/W at 65 W, representing a 66 % reduction in the minimum thermal resistance compared to FGHP, along with a 27.3 °C decrease in the evaporator temperature at 40W. This work provides new insights for dynamic thermal management of electronic devices.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110608"},"PeriodicalIF":5.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881213","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":"High absorption broadband solar energy device and thermal emitter based on titanium metamaterials","authors":"Pinghui Wu ,&nbsp;Wenchao Zhao ,&nbsp;Lina Cui ,&nbsp;Peipei Jiang","doi":"10.1016/j.ijthermalsci.2025.110620","DOIUrl":"10.1016/j.ijthermalsci.2025.110620","url":null,"abstract":"<div><div>As the energy crisis gradually becomes the main cause of global conflict, the utilization of solar energy is imperative for the well-being of the planet. Regarded as a renewable energy source by the scientific community, solar energy has become one of the most important areas of future energy exploration. This paper proposes a solar absorber design based on Ti with fractal geometry. The device is designed to optimize solar energy utilization, thereby achieving higher efficiency. It exhibits over 90 % absorption across the 446.5–2479.5 nm wavelength range, with a weighted average absorption rate of 92.47 % under AM1.5 conditions. The device also exhibits favorable thermal radiation characteristics, achieving thermal radiation efficiencies of 86.5 %, 88.66 %, and 90.07 % at temperatures of 1000 K, 1250 K, and 1500 K, respectively. Furthermore, the structure, material, and parameters of the solar absorber were modified to ascertain the impact of these factors on the absorption process. Finally, the absorber structure is designed to exhibit perfect symmetry in the X and Y directions, making the solar absorber proposed in this paper polarization independent. It boasts an average absorption efficiency of 91.01 %, maintaining this efficacy in both transverse electric (TE) and transverse magnetic (TM) modes up to an incidence angle of 60°. This work innovates by designing a titanium-based split ring structure. Its unique layout enhances the surface plasmon resonance effect in each corner, thereby broadening the bandwidth. Its good environmental adaptability indicates that the structure is suitable for solar energy absorption applications.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110620"},"PeriodicalIF":5.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881214","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":"Insights into the behavior and performance of Linear Structured Filter Coefficients (LSFC) in solving one-dimensional inverse heat conduction problems","authors":"Rodrigo G. Dourado da Silva,&nbsp;Vinícius Bonavides de Castro Campos,&nbsp;Elisan S. Magalhães","doi":"10.1016/j.ijthermalsci.2025.110649","DOIUrl":"10.1016/j.ijthermalsci.2025.110649","url":null,"abstract":"<div><div>This study investigates the use of an artificial neural network-based method for solving one-dimensional inverse heat conduction problems, providing insights into the behavior of network weights and their performance in estimating heat flux in near real-time, in comparison with classical methods such as the sequential function specification method (SFSM) and Tikhonov regularization based filter solutions. This class of problems involves estimating the unknown boundary heat flux condition from experimental temperature measurements at accessible locations. While neural networks have become increasingly popular in this area, there is limited understanding of how their internal parameters, particularly the weights, behave. This article explores the structure of these neural network weights, showing that they exhibit a well-defined, linear, and approximately antisymmetric pattern for this type of problem. With the aid of the neural network solution, it is possible to identify a model for the filter coefficients, referred to in this study as Linear Structured Filter Coefficients (LSFC). The method was applied to real temperature data obtained from laboratory experiments on an AISI 1040 steel plate, in which the heat flux supplied by a resistive heater was estimated using the LSFC approach. The results were compared with traditional filter-based methods, such as Tikhonov regularization and the Sequential Function Specification Method (SFSM). In this study, the LSFCs provide a more compact solution, requiring fewer temperature data points and resulting in shorter response delays, making them suitable for near real-time heat flux estimation.</div></div>","PeriodicalId":341,"journal":{"name":"International Journal of Thermal Sciences","volume":"223 ","pages":"Article 110649"},"PeriodicalIF":5.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881216","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}