Thermal Science and Engineering Progress最新文献

{"title":"Large-scale thermal spreading solution: A synergistic design of aluminum roll-bond flat vapor chamber with embedded spiral woven mesh wick","authors":"Wenbin Yi ,&nbsp;Longsheng Lu ,&nbsp;Shitong Chai ,&nbsp;Yingxi Xie ,&nbsp;Yong Li ,&nbsp;Le Li ,&nbsp;Shu Yang","doi":"10.1016/j.tsep.2025.104185","DOIUrl":"10.1016/j.tsep.2025.104185","url":null,"abstract":"<div><div>Vapor chamber demonstrates exceptional temperature regulation capabilities, making them a promising solution for efficient thermal management in applications such as electronic device cooling and aerospace heat dissipation. Aluminum-based roll-bond flat vapor chamber (RBFVC) is easy to fabricate for large-area applications. However, the absence of wicks in conventional RBFVC hinders the effective circulation of the working fluid, thereby restricting its heat transfer capacity for large-scale applications. To address this limitation, this study introduces a novel RBFVC with embedded aluminum spiral woven mesh wick (RBFVC-ASWM), featuring a vapor–liquid coplanar structure. The newly developed RBFVC-ASWM demonstrates exceptional scalability through its large-area dimensional configuration (590 mm × 290 mm base area) and ultra-thin structural profile (2.06 mm thickness), achieving a breakthrough in confined-space thermal solutions. The embedded ASWM wick enables a higher capillary climbing height and wicking coefficient. Under horizontal conditions, the RBFVC-ASWM with 40 % filling ratio owns the minimum thermal resistance and maximum effective thermal conductivity, which are 0.37℃/W and 1922.78 W/(m⋅K), respectively. Under gravity-assisted conditions, the RBFVC-ASWM with a 20 % filling ratio achieves the lowest temperature difference (2.9℃), thermal resistance (0.0082℃/W) and highest effective thermal conductivity (86833.24 W/(m⋅K)). With an increased filling ratio to 60 %, the highest heat flux dissipation capacity rises to 480 W while the average evaporator temperature reaches up to 61.8℃. RBFVC-ASWM shows better thermal performance than RBFVC-NW (with no wick) and stability under pulsed loads. This research provides a transformative approach to enhance the performance of RBFVC by embedding ASWM wick, offering a scalable, cost-effective, and efficient solution for large-area and ultra-thin heat dissipation systems.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104185"},"PeriodicalIF":5.4,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Combustion and emission characteristics of diesel engines fueled with diethoxymethane blends under varying load conditions","authors":"Shanshan Ruan ,&nbsp;Wenyao Zhao ,&nbsp;Junheng Liu ,&nbsp;Chengcheng Ao","doi":"10.1016/j.tsep.2025.104189","DOIUrl":"10.1016/j.tsep.2025.104189","url":null,"abstract":"<div><div>This study systematically evaluates the combustion, emission, and fuel economy characteristics of pure diesel and a diethoxymethane (DEM) blend (DEMDB, 1:4 vol ratio with diesel) in a diesel engine under varying load conditions. Experimental results demonstrate that both fuels exhibit increased peak in-cylinder pressure and a transition from single-peak to dual-peak heat release rate patterns with rising loads. DEMDB, characterized by low latent heat of vaporization and a distinct molecular structure, displays unique combustion behavior, with prolonged ignition delay and combustion duration at low loads but aligning closely with diesel at high loads. A key finding is that DEMDB significantly reduces soot emissions by 46.5 %–62.1 % across all loads compared to pure diesel, attributed to its oxygen-rich composition that suppresses polycyclic aromatic hydrocarbon formation. However, DEMDB increases NOx emissions by 3.4 %–8.1 % due to extended high-temperature combustion and oxygen-enhanced nitrogen oxidation. Brake thermal efficiency (BTE) of DEMDB is slightly lower than diesel at low loads but surpasses diesel at medium-to-high loads, reflecting enhanced combustion efficiency. These findings underscore DEM’s potential as a sustainable, biomass-derived diesel additive for achieving cleaner combustion, while highlighting the need for combustion phasing optimization and advanced aftertreatment to mitigate NOx emissions.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104189"},"PeriodicalIF":5.4,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Co-pyrolysis of poly (lactic acid) and sesame stalk: Synergistic effect, kinetic and thermodynamic studies","authors":"Zhen Huang,&nbsp;Hong-da Ji,&nbsp;Yi Liu,&nbsp;Ying Wang,&nbsp;Zi-xin Wang,&nbsp;Yu-jiang Liu","doi":"10.1016/j.tsep.2025.104191","DOIUrl":"10.1016/j.tsep.2025.104191","url":null,"abstract":"<div><div>For the study of the biomass effect on pyrolysis of plastic wastes, co-pyrolysis features and kinetics of poly (lactic acid) (PLA)/sesame straw hybrids have been investigated for the first time by experimental evaluation and theoretical analysis. Our results show that the onset pyrolysis temperatures of PLA have decreased considerably after blending with sesame straw and there is a considerable synergistic effect between two feedstocks. Based on nonisothermal results, kinetic analysis has been isoconversionally made by using integral and differential methods and their performances in obtaining activation energy are fully compared. The calculations show that the activation energies are 115.8∼150.1, 150.7∼210.1 and 132.2∼178.5 kJ/mol for the PLA mixtures with the sesame straw content 10, 20 and 30 mass%, respectively. The pre-exponential factor has been calculated model-freely with the use of the compensation effect while the reaction mechanism function has been appropriately determined by following the Master plots method. Additionally, thermodynamic analysis for the entire pyrolysis is also done in terms of enthalpy, entropy and Gibbs free energy changes. Overall, the results acquired from this work may open up new avenues for thermally disposing waste plastics and advancing sustainable energy generation.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104191"},"PeriodicalIF":5.4,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of height and secondary flow patterns of circle, square and triangle shaped pin fins on microchannel heat sinks performance","authors":"Moza Alteneiji,&nbsp;Ahmed Raafat,&nbsp;Saeed K. Alnuaimi","doi":"10.1016/j.tsep.2025.104166","DOIUrl":"10.1016/j.tsep.2025.104166","url":null,"abstract":"<div><div>The geometric design of pin fins significantly impacts the thermal and hydraulic performance of microchannel heat sinks (MCHSs). This study, which uses Ansys Fluent, investigates the effect of pin fin height (full height and half height) and shape (circular, square, triangular) on the pressure drop, temperature distribution, velocity fields, Nusselt number, and thermal efficiency <!--> <!-->for different Reynolds numbers. Six different <!--> <!-->configurations were studied. It has been concluded that circular pin fins have the least pressure drop, whereas square fins <!--> <!-->have maximum resistance. While full-height fins gather more thermal energy, half-height fins outperformed<!--> <!-->these both thermally and hydraulically, owing to increased secondary cooling flows and blockage effects reduction. The half-height circular pin fin was identified as the optimum design being able to achieve a high heat <!--> <!-->transfer coefficient with a low hydrodynamic resistance. The <!--> <!-->results of this analysis could provide beneficial guidelines for the optimization of the pin fin geometry in high-performance thermal management applications.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104166"},"PeriodicalIF":5.4,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parametric study of a cold plate for electronic systems cooling","authors":"Crístofer Hood Marques ,&nbsp;Jeferson Avila Souza ,&nbsp;Chaianan Sailabada ,&nbsp;Juan C. Ordonez","doi":"10.1016/j.tsep.2025.104172","DOIUrl":"10.1016/j.tsep.2025.104172","url":null,"abstract":"<div><div>The International Maritime Organization’s goal of achieving net-zero greenhouse gas emissions by around 2050 made full electric ships draw attention as a means to achieve this target. Effective thermal management systems are crucial for electric ships to dissipate heat and prevent overheating of critical components. The present study aims to investigate the effect of geometric and non-geometric variables on the technical viability of a cold plate intended to cool a Power Electronics Building Block. A combination of four open-source software packages and one transport properties library was used to simulate the effect of four decision variables on five measures of merit. One design was considered with a novel S-type pipe shape and different values for the plate aspect ratio, radius ratio of the pipe, flow pressure loss, and plate mass. Results show that increasing plate mass and allowable pressure loss significantly reduce global thermal resistance and exergy destruction. Temperature distribution and usable area are highly sensitive to the geometric configuration. The proposed design index effectively captures the trade-off between thermal performance and system-level constraints, including weight and pumping power. The study recommends increasing decision variable values, but the best configuration ranking depends on the chosen measure of merit.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104172"},"PeriodicalIF":5.4,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal performance investigation on an optimal PVT-ground coupled heat pump system for a teaching building","authors":"Changxing Zhang ,&nbsp;Xuezheng Tian ,&nbsp;Qing Liu ,&nbsp;Jianhua Fan ,&nbsp;Sheng Li","doi":"10.1016/j.tsep.2025.104182","DOIUrl":"10.1016/j.tsep.2025.104182","url":null,"abstract":"<div><div>With the continuous rise in energy demand and growing environmental concerns, the combination of ground-coupled heat pump (GCHP) and photovoltaic/thermal (PVT) is becoming a promising solution to improve the performance of the two renewable energy technologies. It is necessary for building energy supply system to enlarge the integration effect of solar energy and geothermal energy by optimizing their combination. This paper presents the thermal performance investigation on a PVT-GCHP system for a teaching building in Beijing. A mathematical system model is firstly proposed to optimize the combination of PVT array and double U-pipes borehole heat exchangers based on the available roof area and in-situ geological condition. The annual performance and energy flow of the PVT-GCHP system are focused in the presented numerical investigation. The result shows that the directly utilized solar energy and the ground heat provides respectively 37.5% and 35.5% of the annual energy input of the system. The PVT generated electricity accounts for 34.2% of the annual total electricity consumption, resulting in an annual season performance factor of the PVT-GCHP system up to 5. For the utilization of the two renewable energies, monthly solar fraction shows the large fluctuations, but the monthly renewable heat fraction is relatively stabilized from 71.3% to 95% after solar energy coupled with ground heat in the presented system, and the yearly value is promoted to 80%.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104182"},"PeriodicalIF":5.4,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 holistic study on solar photovoltaic-based cleaner hydrogen production facilities: Economic and performance assessments","authors":"Dogan Erdemir ,&nbsp;Ibrahim Dincer","doi":"10.1016/j.tsep.2025.104174","DOIUrl":"10.1016/j.tsep.2025.104174","url":null,"abstract":"<div><div>This study presents a holistic technoeconomic analysis of solar photovoltaic-based green hydrogen production facilities, assessing hydrogen output potential and cost structures under various facility configurations. Four system cases are defined based on the inclusion of new photovoltaic (PV) panels and hydrogen storage (HS) subsystems, considering Southern Ontario solar data and a 30-year operational lifespan. Through a system level modeling, we incorporate the initial costs of sub-systems (PV panels, power conditioning devices, electrolyser, battery pack, and hydrogen storage), operating and maintenance expenses, and replacement costs to determine the levelized cost of hydrogen (LCOH). The results of this study indicate that including hydrogen storage significantly impacts optimal electrolyser sizing, creating a production bottleneck around 400 kW for a 1 MWp PV system (yielding approximately 590 tons H₂ over a period of 30 years), whereas systems without storage achieve higher yields (about 1080 tons of H₂) with larger electrolysers (approximately 620 kW). The lifetime cost analysis reveals that operating and maintenance cost constitutes the dominant expenditure (68–76 %). Including hydrogen storage increases the minimum LCOH and sharply penalizes electrolyser oversizing relative to storage capacity. For a 1 MWp base system, minimum LCOH ranged from approximately $3.50/kg (existing PV, no HS) to $6/kg (existing PV, with HS), $11–12/kg (new PV, no HS), and $22–25/kg (new PV, with HS). Leveraging existing PV infrastructure drastically reduces LCOH. Furthermore, significant economies of scale are observed with increasing PV facility capacity, potentially lowering LCOH below $2/kg at the 100 MWp scale. The study therefore underscores that there is a critical interplay between system configuration, component sizing, operating and maintenance management, and facility scale in determining the economic viability of solar hydrogen production.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104174"},"PeriodicalIF":5.4,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy and exergy-based thermodynamic assessment and optimization of a reheat Brayton–regenerative Kalina cycle hybrid system","authors":"B.G. Chandra Sekhar ,&nbsp;G.Ravi Kiran Sastry ,&nbsp;H.N. Das ,&nbsp;S.K. Gugulothu","doi":"10.1016/j.tsep.2025.104180","DOIUrl":"10.1016/j.tsep.2025.104180","url":null,"abstract":"<div><div>There has always been a concerted effort to enhance the efficiency of power generation systems, which has significantly rationalized the modern power plants. Taking a leaf out of these works, an endeavour is made to investigate a novel hybrid system of Reheat Brayton and Regenerative Kalina cycles. The assessment protocol involved the framing of molar, energy, and exergy equations for the devices and solving them in the MATLAB environment. Thermodynamic evaluation from both first and second law perspectives using Coke Oven gas (COG) as fuel is the crux of this research. Furthermore, this work includes an optimization study and comparison of the fuels COG, Synthesis gas (SG), and methane in terms of air–fuel ratios, dissociation effects, and greenhouse gas emissions. The Brayton-Kalina power ratio was found to vary from 0.154 to 0.679 at a minimum pressure ratio (r_p) of 4 for a temperature range of 400 ℃ to 600 ℃. However, with an increase in the pressure ratio, the power ratio also increased appreciably, hovering in the range of 3.57–5.63 at its maximum value. The existence of a temperature-dependent optimum pressure ratio in the range of 8 to 15, wherein the total exergy destruction attains a minimum, is a noteworthy observation. The optimal values of Exergy efficiency, Ecological coefficient of performance, and Air rate are 26.43%, 0.359, and 0.146, respectively. A comparison of fuels revealed that specific carbon emissions were maximum for SG and minimum for methane. The dissociation effects were minimal in SG and the highest in methane gas.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104180"},"PeriodicalIF":5.4,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 investigation of heat transfer enhancement in shell-and-tube heat exchangers with helically coiled tube for low-temperature cold-start applications","authors":"Siyu Zheng ,&nbsp;Zengxin Qiao ,&nbsp;Mingshan Wei ,&nbsp;Ran Tian ,&nbsp;Xiaoxia Sun","doi":"10.1016/j.tsep.2025.104176","DOIUrl":"10.1016/j.tsep.2025.104176","url":null,"abstract":"<div><div>Shell-and-helically coiled tube heat exchangers (SHCTHEs) are widely used in industry, yet limited research exists on natural convection and heat transfer enhancement strategies for such exchangers. This study presents a numerical investigation of thermal performance and associated oil natural convection behavior in a SHCTHE for a diesel engine lubricant tank under low-temperature cold-start conditions. The accuracy of numerical method was validated experimentally. For the baseline finless tube, the influence of coil pitch on heating performance was analyzed, elucidating natural convection mechanisms in low-viscosity oils at varying pitches. Subsequently, Annular coil fins were then added to optimize heat transfer. Parametric studies focused on fin geometry, height, and fin cycles, with Rayleigh and Nusselt number correlations identifying the enhancement mechanisms. Lastly, the optimal fin structure was obtained through the overall performance factor. Results showed that closely spaced smooth coils promoted the development of the thermal boundary layer, which inhibited heat transfer. As coil pitch increased from 1.05 to 1.2, the average oil temperature rose from 18.89 °C to 34.41 °C, with heat transfer power improving by 23.2 %. Further increases in coil pitch had minimal effect on the performance, with the optimal result at a coil pitch of 1.8. This increase weakened the thermal boundary layer on the tube wall, enhancing natural convection and improving heat transfer. For the tube with annular coil fins, fin shape had little effect on heat transfer, while increasing fin cycles and height improved performance by improving thermal conductivity. Additionally, excessive fin length suppressed the occurrence of natural convection in the oil. The optimal fin configuration was found to be a fin height-to-pitch ratio of 0.8 and 200 fin cycles, balancing heat transfer efficiency and material consumption.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104176"},"PeriodicalIF":5.4,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Beer-Lambert Law-Based general acceleration approach for numerical computation of radiative heat transfer within silica aerogel","authors":"Hai-Bo Xu ,&nbsp;Chuan-Yong Zhu ,&nbsp;Lin Tian ,&nbsp;Zeng-Yao Li","doi":"10.1016/j.tsep.2025.104173","DOIUrl":"10.1016/j.tsep.2025.104173","url":null,"abstract":"<div><div>Radiative heat transfer plays a crucial role in heat transfer within silica aerogel. Due to the complex optical properties of silica aerogel, approximate models often introduce non-negligible deviations in radiative thermal conductivity estimation. Although partitioning radiation into spectral bands is adequate for achieving accurate numerical modeling of radiative heat transfer, this approach incurs high computational costs. In this study, a Beer-Lambert law-based general acceleration approach is proposed to simplify the radiative heat transfer calculations in silica aerogel. The proposed approach exploits the significant variation in spectral optical thickness across bands. Specifically, it truncates the source function integration in the incident radiation calculation and neglects contributions from distant regions in bands with large optical thickness. Results show that the proposed approach reduces computational time by up to 33% while keeping the relative deviation in radiative heat flux below 0.01%. Moreover, the computational efficiency further improves as the optical thickness increases.</div></div>","PeriodicalId":23062,"journal":{"name":"Thermal Science and Engineering Progress","volume":"67 ","pages":"Article 104173"},"PeriodicalIF":5.4,"publicationDate":"2025-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}