Case Studies in Thermal Engineering最新文献

{"title":"Effect of fire-source location on flame behavior and temperature distribution in subway carriages with multiple lateral openings","authors":"Xinyu Wang,Guoqing Zhu,Xuyao Qi,Guowei Zhang,Lu He,Min Peng,Tong Liu,Yuyang Ming","doi":"10.1016/j.csite.2026.108501","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108501","url":null,"abstract":"","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"28 1","pages":"108501"},"PeriodicalIF":6.8,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894392","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":"Variable U-value approaches toward reproducible in-situ estimation of linear thermal transmittance at a T-shaped Junction: A simulation-based preliminary study","authors":"Seon-bin Kim,Seon-in Kim,Duk-Joon Park,Eui-Jong Kim","doi":"10.1016/j.csite.2026.108482","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108482","url":null,"abstract":"","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"8 1","pages":"108482"},"PeriodicalIF":6.8,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894394","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":"Multi-objective optimization of desiccant wheel performance using adaptive sampling and SHAP analysis","authors":"Jun Jeong,Mahdi Koushaeian,Hwa Yeong Lee,Jun Su Park,Chan Hee Han,Jae Dong Chung","doi":"10.1016/j.csite.2026.108490","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108490","url":null,"abstract":"","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"201 1","pages":"108490"},"PeriodicalIF":6.8,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894183","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":"Assessment of thermal-hydraulic performance in synthetic-jet-actuated ribbed channels","authors":"Zhihui Zhang,Tieyu Gao,Chaocai Zhang,Ruihao Cheng,Shiyu Lai,Lulu Zhu,Jianying Gong","doi":"10.1016/j.csite.2026.108497","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108497","url":null,"abstract":"","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"21 1","pages":"108497"},"PeriodicalIF":6.8,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical and experimental study of high-power microwave heating for fracturing permafrost in extreme cold regions","authors":"Zhen-Hua Shan,Jia-Jie Jiang,Si-Jia Li,Hong-Fang Liu,Xian-Jun Li,Li-Wu Fan","doi":"10.1016/j.csite.2026.108484","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108484","url":null,"abstract":"","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"138 2 1","pages":"108484"},"PeriodicalIF":6.8,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894399","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":"Enhanced performance and thermoelectric properties of composite electrothermal coatings driven by photovoltaics","authors":"Guofen Rui,Yuxuan He,Haifei Chen,Jie Yang,ErDeng Du,Mingguo Peng","doi":"10.1016/j.csite.2026.108502","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108502","url":null,"abstract":"","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"58 1","pages":"108502"},"PeriodicalIF":6.8,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894100","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":"Inverse design approach for predicting the optimal geometry of horizontal annular wavy perforated fins","authors":"Cheng-Hung Huang,Bo-Yun Chen","doi":"10.1016/j.csite.2026.108486","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108486","url":null,"abstract":"","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"42 1","pages":"108486"},"PeriodicalIF":6.8,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148894397","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 and numerical analysis of heat transfer and friction factors in ribbed rectangular convergent and divergent channels","authors":"Tiao Zhang, Xu Wang, Ming Li, Shilin Guo, Jianhua Wang","doi":"10.1016/j.csite.2026.108496","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108496","url":null,"abstract":"This study experimentally and numerically investigates the heat-transfer and flow-resistance characteristics of ribbed rectangular tapered channels for turbine-blade internal cooling. Infrared thermography was employed to obtain full-surface temperature and Nusselt-number distributions on the one-side ribbed wall of convergent and divergent channels with 60° parallel ribs. Experiments were conducted at Reynolds numbers ranging from 13,845 to 41,535, and the measured data were used to validate steady Reynolds-averaged numerical simulations. Among the tested turbulence models, the V2F model showed the closest agreement with the measured local Nusselt-number distributions and friction factors. Based on the validated numerical method, the local heat-transfer distribution, friction factor, secondary-flow intensity, and overall thermal performance were compared among the convergent, divergent, and straight ribbed channels. The convergent channel produced a pronounced increase in local heat transfer from the middle region to the outlet because of flow acceleration and enhanced near-wall mixing, but it also caused the largest friction loss. Its friction factor was approximately 1.5 times that of the straight channel and about 4.2 times that of the divergent channel. In contrast, the divergent channel showed a more uniform heat-transfer distribution and a much lower friction factor owing to flow deceleration. As the Reynolds number increased, the influence of channel tapering on heat-transfer redistribution became weaker. Based on the adopted thermal-performance factor, the divergent channel achieved the best overall thermal-hydraulic performance among the three configurations, with <ce:italic>η</ce:italic> approximately 1.4-1.5. These findings provide useful guidance for the thermal-hydraulic design of ribbed tapered cooling passages.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"25 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148884851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical assessment and building-scale integration of water-cooled PV/T systems for cooling load mitigation in hot-arid climates","authors":"Mahmood Mazin Ali Mahmood, Keng Wai Chan","doi":"10.1016/j.csite.2026.108444","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108444","url":null,"abstract":"Hybrid Photovoltaic/Thermal (PV/T) systems offer a dual-benefit pathway for decarbonizing the building sector by simultaneously generating electricity and recovering thermal energy from a single rooftop-integrated collector. Buildings in hot-arid climates such as Mosul, Iraq face extreme summer cooling demands driven by ambient temperatures exceeding 42 °C and peak solar irradiance reaching 950 W/m<ce:sup loc=\"post\">2</ce:sup>, yet high-fidelity numerical assessments of PV/T systems specifically calibrated to these conditions remain scarce. This study presents a three-dimensional, steady-state Computational Fluid Dynamics (CFD) investigation — conducted in ANSYS Fluent 2024R1 — of a single water-cooled PV/T collector module integrated into a 500 m<ce:sup loc=\"post\">2</ce:sup> residential rooftop in Mosul. The novelty of this work lies in combining high-fidelity collector-level CFD modelling with an analytical heat-flux-based methodology to estimate the roof-attributable cooling load reduction at building scale under extreme Iraqi arid climate conditions. Parametric simulations were conducted across four coolant mass flow rates (0.05–0.20 kg/s) under peak summer irradiance (950 W/m<ce:sup loc=\"post\">2</ce:sup>). The CFD model was validated against published experimental data, with mean absolute percentage errors (MAPE) below 3% for coolant outlet temperature rise across all tested flow rates, establishing model reliability. Results show that increasing the mass flow rate to 0.20 kg/s reduces the average PV surface temperature from 343 K to 318 K, effectively mitigating thermal hotspots and enhancing electrical efficiency by up to 8%. While the coolant temperature gain (ΔT) decreased from 9.0 K to 4.5 K at higher flow rates, the total thermal power extracted per module increased monotonically, reaching approximately 3.8 kW at 0.20 kg/s. Based on CFD-derived PV surface temperature reductions and an analytical roof heat flux model (using steady-state conduction and sol-air temperature equations), the four-collector array is estimated to reduce the roof-attributable cooling load by approximately 13–18% of the total building baseline load, corresponding to an absolute reduction of 1.6–2.2 kW. These findings confirm that building-integrated PV/T systems represent a high-efficiency, zero-footprint solution for combined energy generation and thermal load mitigation in arid regions, and provide a transparent, reproducible methodology for building-scale load estimation from collector-level CFD results.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"53 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148884854","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":"Measurement and analysis of transient hydrogen injection rates from pintle-type injector in choked flow conditions","authors":"Seoksu Moon, Gyuhan Bae, Jaehyun Lee","doi":"10.1016/j.csite.2026.108471","DOIUrl":"https://doi.org/10.1016/j.csite.2026.108471","url":null,"abstract":"The transient variation of fuel injection rate is a critical factor affecting mixture formation and combustion phase as well as the energy supply rate in direct-injection engines. Despite its great importance, transient injection rates of hydrogen direct-injection injectors have rarely been characterized previously under various injector operating conditions considering injector dynamics. The current study measures and analyzes the transient injection rates of a pintle-type hydrogen injector under various injection and ambient pressures in choked flow conditions and examines the predictability of transient injection rates based on the compressible flow theory of converging-diverging nozzles and pintle dynamics. The transient injection rate profile is obtained by measuring the jet force at the nozzle exit and calibrating it to the time-averaged mass flow rate data. An increase in injection pressure caused a steeper rising slope of injection rate and a longer total injection duration with a linear increase in quasi-steady injection rate. As the ambient pressure increased, the rising slope of the injection rate and the total injection duration decreased, while the quasi-steady injection rate remained nearly the same. These transient and quasi-steady injection rate characteristics were able to be predicted based on the mass flow rate equation of converging-diverging nozzles in choked flow conditions and the transient pintle stroke as the input parameter.","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"43 1","pages":""},"PeriodicalIF":6.8,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148885173","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}