Case Studies in Thermal Engineering最新文献

{"title":"Impact on induced magnetic field over a second-grade hybrid nanofluid in unsteady thermal systems","authors":"Nagaraju Gajjela ,&nbsp;Arun Seeralan Balakrishnan ,&nbsp;Mahesh Garvandha ,&nbsp;H. Niranjan ,&nbsp;Adigoppula Raju ,&nbsp;Sivakumar S","doi":"10.1016/j.csite.2025.105956","DOIUrl":"10.1016/j.csite.2025.105956","url":null,"abstract":"<div><div>The study is motivated by the need to enhance thermal management systems and optimize fluid flow in advanced engineering applications where Hnfs with superior heat transfer characteristics are required. This study examines the thermal and fluid dynamics of second-grade hybrid nanofluids with Al₂O₃ and Ag nanoparticles on an unsteady stretching sheet, considering suction, induced magnetic fields, and second-order mixed convection effects. This study bridges gaps in understanding viscoelastic fluid dynamics, magnetic effects, and advanced heat transfer, offering crucial insights to enhance efficiency in energy systems, electronics cooling, and magnetic fluid technologies. This study investigates unsteady flow and heat transfer using the Cattaneo-Christov model, considering thermal relaxation, viscous dissipation, radiation, and heat sources. The study derives governing equations from momentum, magnetic induction, and energy principles, transforms them into nonlinear ODEs, and solves using the Chebyshev spectral collocation method with quasi-linearization. The results indicate that fluid and IMF mobility increase with stagnation and second-grade parameters but decline when unsteady and magnetic parameters are present. Thermal behavior diminishes with non-linear mixed convection and thermal relaxation parameters and rises with increased magnetic and heat source effects. We calculate and graphically illustrate the Nusselt number and dimensionless skin friction coefficients for comprehensive analysis. This work finds specific applications in optimizing thermal management systems, magnetic fluid technologies, and energy systems where precise control over heat and fluid dynamics is essential for performance improvement. It also contributes to designing advanced cooling solutions in electronics and other high-performance systems.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"69 ","pages":"Article 105956"},"PeriodicalIF":6.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548719","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":"Drying characteristics of white radish slices under heat pump — Low-temperature regenerative wheel collaborative drying","authors":"Junhai Yan,&nbsp;Weinan Han,&nbsp;Ben Wei,&nbsp;Yin Liu,&nbsp;Long Gao,&nbsp;Longji Wang,&nbsp;Song Wang,&nbsp;Mingru Zhu,&nbsp;Ziheng Huo","doi":"10.1016/j.csite.2025.105950","DOIUrl":"10.1016/j.csite.2025.105950","url":null,"abstract":"<div><div>To address the issues of low efficiency, high energy consumption, and poor quality associated with traditional food drying methods, this study proposes a heat pump–low-temperature regeneration wheel collaborative drying system. This system offers advantages such as a fast drying rate, high food drying quality, and low energy consumption. To further investigate its drying characteristics, drying experiments were conducted on white radish slices at temperatures of 35 °C, 40 °C, and 45 °C. The results indicate that, compared to heat pump drying, the collaborative drying mode exhibits significant advantages: drying time was greatly reduced, with a minimum reduction of 60 min at all temperatures. The maximum drying rate increased significantly, ranging from 17.04 % to 19.51 %. Energy consumption was noticeably reduced, decreasing by 7.48 %–11.68 %. Moreover, the effective moisture diffusivity improved by 7.98 %–11.49 %, product shrinkage decreased by 4.00 %–5.56 %, rehydration ratios increased by 3.25 %–8.20 %, and sensory evaluation improved by 17.29 %–38.09 %. Additionally, based on the experimental data, the Wang and Sing model was determined to be the most suitable mathematical model for describing the collaborative drying process, exhibiting a coefficient of determination (R²) exceeding 0.999. This research demonstrates that the heat pump–low-temperature regeneration wheel collaborative drying system has significant potential for market application due to its high product drying quality and low energy consumption.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"69 ","pages":"Article 105950"},"PeriodicalIF":6.4,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548917","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":"Response mechanism of methane non-premixed diffusion flame under the influence of an applied magnetic field","authors":"Yaqing Li ,&nbsp;Haochen Li ,&nbsp;Jun Deng ,&nbsp;Yutao Zhang ,&nbsp;Chi-Min Shu ,&nbsp;Qiang Guo ,&nbsp;Bo Che","doi":"10.1016/j.csite.2025.105944","DOIUrl":"10.1016/j.csite.2025.105944","url":null,"abstract":"<div><div>To explore the influence of an applied magnetic field on non-premixed diffusion flames, a methane non-premixed diffusion flame combustion system was constructed. MATLAB was utilized for processing flame split-frame images, while DPIV technology was employed to analyze the two-dimensional instantaneous flow field of the flame. A custom-built Langmuir ion probe was used to monitor the variation in flame ionic current concentration. The study reveals that under constant excitation voltage, magnetic intensity along the flame axis decreases linearly with nozzle distance, exceeding a 60 % reduction. In a negative gradient field, the flame elongates, with height increasing and width narrowing as the magnetic field gradient intensifies. The applied magnetic field raised the average flame temperature significantly, peaking at a 379.4 °C increase for a 20 mm nozzle at 100 V, while jet exit temperature decreased with higher flow rates. Ionic current along the flame axis increased with nozzle distance, improving combustion efficiency. At a flow rate of 0.60 slpm, ionic current dropped sharply at the jet exit due to charged particle accumulation near the flame tip. The ionic current rose from sub-microamp to microamp levels under the magnetic field, providing valuable insights for flame combustion regulation.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"68 ","pages":"Article 105944"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509130","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":"Ventilation performance evaluation of rectangular jet-enhanced exhaust hood under the influence of thermal contamination jet in industrial buildings","authors":"Jing Zhang ,&nbsp;Cong Lou ,&nbsp;Mengxiao Xie ,&nbsp;Jun Gao","doi":"10.1016/j.csite.2025.105948","DOIUrl":"10.1016/j.csite.2025.105948","url":null,"abstract":"<div><div>In industrial contexts, exhaust hoods play a pivotal role in the control of heat and heat-driven pollutants during manufacturing processes. The present study focuses on the rectangular jet-enhanced exhaust hood (RJEH) in an industrial building affected by the thermally contaminated jet as the case study object. In this study, the CFD method was employed to assess the performance and the performance impact factors of the RJEH, utilizing capture efficiency as the evaluation index. Based on the performance study, the optimal operating parameters and the selected method were also analyzed. The findings indicate that, in comparison with conventional exhaust hoods, the implementation of radial jets has the potential to improve the performance of rectangular hoods significantly by impeding contaminant spillage through the blocking effect. The performance of RJEH was found to be primarily influenced by two main factors: jet velocity and exhaust rate. The employment of optimal parameters enables the RJEH to withstand the adverse effects of external variations, attaining capture efficiencies of 90 % or more under diverse conditions. The results of the study can provide assistance in the efficient design of industrial ventilation and serve as a reference for promoting national high-performance ventilation technology and industrial energy conservation.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"68 ","pages":"Article 105948"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512615","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":"Thermodynamic and thermoeconomic analysis of solar derived ORC with storage system utilizing PCM","authors":"Rahim Zahedi,&nbsp;Abolfazl Ahmadi","doi":"10.1016/j.csite.2025.105942","DOIUrl":"10.1016/j.csite.2025.105942","url":null,"abstract":"<div><div>Organic Rankine cycle (ORC) is an appropriate technology for converting low quality thermal sources into electricity. In this research, ORC with solar vacuum tube collector drive has been simulated and studied in terms of energy, exergy, and economic exergy. Thereupon, different issues such as input temperature and pressure to the turbine, temperature difference of organic cycle evaporator pinch, and solar flux have been assessed. The results indicate that the energy and exergy efficiency equals to 44.3 and 49.7 respectively and the value of output work and irreversibility also equals to 50.6 and 719.1 kW respectively. Due to the high initial costs and high costs of destruction, solar collector and storage tank are the most important components regarding exergo-economic issues. The analytical results indicate that the increase of evaporator temperature will have positive effects on the cycle performance and the increase of pinch temperature will have negative effects on system performance. From economic point of view, the increase of evaporator and pinch temperature will decrease total costs. Moreover, change in solar energy flux improves the system performance in economic terms and leads to an increase in energy and exergy efficiency.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"68 ","pages":"Article 105942"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512618","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":"Comparative thermodynamic analyses of Rankine cycles using different working fluids for LNG cold energy recovery","authors":"Qiang Liu ,&nbsp;Jian Song ,&nbsp;Yuanyuan Duan","doi":"10.1016/j.csite.2025.105952","DOIUrl":"10.1016/j.csite.2025.105952","url":null,"abstract":"<div><div>This study investigates the impact of condensation temperature on the thermodynamics of Rankine cycles for LNG cold energy recovery using seawater as heat source. The turbine power output is maximized when the LNG temperature at the condenser outlet approaches the pseudocritical temperature at the supercritical pressure, where specific heat peaks. Both evaporation and condensation temperatures are optimized to maximize the net power output considering the limitations of turbine exhaust vapor quality and condensation pressure. The results show that R32 outputs the highest net power, followed by R1270. Although the turbine with R170 generates comparable power to R32, the net power output is 8 % lower due to the highest parasitic power consumption. The cycle using a low critical temperature working fluid requires a more compact turbine with lower inlet volumetric flow rate and smaller evaporator area than that using a high critical temperature fluid. The turbine using R32 offers a moderate size with a higher expansion ratio. R744 requires the least evaporator area and total area for per unit net power, while R32 has the smallest condenser area but requires 78 % more evaporator area than R744.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"69 ","pages":"Article 105952"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549006","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":"Computational fluid dynamics simulation of enhanced heat transfer in ground-air heat exchangers using turbulators in PVC pipe systems","authors":"Payam Jalili,&nbsp;Bahram Jalili","doi":"10.1016/j.csite.2025.105949","DOIUrl":"10.1016/j.csite.2025.105949","url":null,"abstract":"<div><div>This study investigates heat transfer enhancement in a ground-air heat exchanger (GAHE) system by incorporating turbulators within the pipe, aiming to address seasonal heating demands in residential and industrial settings. Initially, simulations were conducted without turbulators, providing baseline heat transfer rates across flow velocities and inlet temperatures. Subsequently, turbulators were introduced to examine their influence on heat transfer performance. The model incorporated airflow velocities ranging from 0.1 to 5 m per second alongside inlet air temperatures from 0 to 16 °C to capture realistic environmental variations. The simulation maintained a constant surrounding soil temperature of 18.8 °C, reflecting typical subsurface conditions. The results reveal that adding turbulators significantly increases the heat transfer rate, with an improvement of approximately 15.22 % at a flow velocity of 5 m/s, where the heat transfer rate rose from 2253.135 W to 2596.305 W. At lower velocities, the impact was even more pronounced; for instance, at 2 m/s, the rate increased by 17.31 %, from 841.386 W to 987.128 W. This study highlights the effectiveness of turbulators in boosting the GAHE system's efficiency, especially at lower velocities, which could be advantageous for energy conservation in heating applications.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"68 ","pages":"Article 105949"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143512616","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":"Pouch lithium-ion battery thermal management by using a new liquid-cooling plate with honeycomb-like fins","authors":"Linxiang Fu ,&nbsp;Zhendong Zhang ,&nbsp;Lei Sheng ,&nbsp;Zhiwei Kuang ,&nbsp;Zehua Zhu ,&nbsp;Qing Bi","doi":"10.1016/j.csite.2025.105945","DOIUrl":"10.1016/j.csite.2025.105945","url":null,"abstract":"<div><div>Excellent thermal management plays a significant role in ensuring lithium-ion batteries' performances. This work proposes a thermal control method for pouch batteries by using a cooling-plate with novel channels designed with streamlined and honeycomb-like fins. Numerically, such effects are studied as coolant mass flow, inlet temperature, cooling-plate's main channel aspect ratio, and fin spacing on the battery's thermal performance. An optimal scheme for comprehensive performance of the battery is selected by orthogonal test method. The results show that increasing coolant mass flow can suppress the battery's temperature rise. Moreover, the pressure drop of cooling-plate increases linearly. Decreasing coolant inlet temperature has a positive impact on reducing battery temperature rise and minimizing temperature difference. Increasing the main channel aspect ratio and fin spacing of cooling-plate both reduce the battery's minimum temperature, but the uniformity of coolant flow distribution is improved and deteriorated, respectively. The orthogonally optimized scheme (A₅B₂C₂D₃) can control maximum cell temperature at 27.29 °C while reducing pressure drop by up to 53.71 %. Experimental validation shows that the designed cooling-plate has excellent cooling performance, and the maximum temperature deviation is within 2.00 °C. The study would be valuable to deeply understand the thermal design progress of battery cooling-plate.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"69 ","pages":"Article 105945"},"PeriodicalIF":6.4,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548922","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":"Deep learning approach for predicting heat transfer in water-based hybrid nanofluid thin film flow and optimization via response surface methodology","authors":"Maddina Dinesh Kumar ,&nbsp;Gurram Dharmaiah ,&nbsp;Se-Jin Yook ,&nbsp;C.S.K. Raju ,&nbsp;Nehad Ali Shah","doi":"10.1016/j.csite.2025.105930","DOIUrl":"10.1016/j.csite.2025.105930","url":null,"abstract":"<div><h3>Significance</h3><div>There have been rapid developments in ternary hybrid nanofluids in the past few years due to their potential and importance. The potential of ternary hybrid nanofluids to maximise heat transport has enthralled researchers, prompting them to conduct a more thorough investigation of the performance of common base fluids. Researchers utilise nanofluids in applications like sophisticated cool systems, atriums, biomedical artifices, and active-chemical reactors to maximise mass and heat transmission.</div></div><div><h3>Objective</h3><div>Dynamic simulations of an unsteady Ternary-hybrid nano flow via Thin film is investigated by considering Thermal radiation, Inclined MHD, and viscous dissipation.</div></div><div><h3>Method</h3><div>ology: The present study develops a novel mathematical model using PDEs as governing equations. These PDEs can be transformed through similarity transformations into ODEs after the BVP4C is utilised to solve them numerically.</div></div><div><h3>Findings</h3><div>The current study showed that SWCNT-Al₂O₃-MWCNT with H2O has a higher heat transfer rate than SWCNT-Al₂O₃ with H2O, making it appropriate for improving thermal performance in cutting-edge cooling systems such as heat exchangers and electrical devices.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"68 ","pages":"Article 105930"},"PeriodicalIF":6.4,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143509287","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":"Efficient cooling capability in microchannel heat sink reinforced with Y-shaped fins: Based on artificial neural network, genetic algorithm, Pareto front, and numerical simulation","authors":"Xiang Ma ,&nbsp;Ali Basem ,&nbsp;Pradeep Kumar Singh ,&nbsp;Rebwar Nasir Dara ,&nbsp;Ahmad Almadhor ,&nbsp;Amira K. Hajri ,&nbsp;Raymond Ghandour ,&nbsp;Barno Abdullaeva ,&nbsp;H. Elhosiny Ali ,&nbsp;Samah G. Babiker","doi":"10.1016/j.csite.2025.105936","DOIUrl":"10.1016/j.csite.2025.105936","url":null,"abstract":"<div><div>Microchannel heat sinks play a vital role in modern technology due to the increasing demand for efficient thermal management in compact electronic devices. These systems enhance heat dissipation and maintain optimal operating temperatures, yet conventional heat sinks often fail to meet the stringent cooling demands of modern technologies. To address this, a novel microchannel heat sink reinforced with Y-shaped fins was introduced as an advanced cooling solution. Unlike traditional straight fins, Y-shaped fins improve flow distribution, reduce hot spots, and enhance temperature uniformity across the system's surface. Artificial neural network models were developed to evaluate the impact of fin geometry on performance. Key geometric parameters, including fin attack angle, vertical spacing, and horizontal spacing, were used as input variables, while the Nusselt number and pressure drop were selected as performance outputs. The results revealed that the fin attack angle was the most influential parameter affecting the outputs. The applied cost functions demonstrated the high accuracy of the models in predicting system performance. A genetic algorithm was employed for single-objective optimization targeting three criteria: maximizing total efficiency, minimizing pressure drop, and maximizing the Nusselt number. Two optimized designs were proposed. Design 1 (with an attack angle of 60°, vertical spacing of 120 μm, and horizontal spacing of 400 μm) was optimal for maximizing total efficiency and minimizing the pressure drop. This design achieved a 69.26 % increase in the Nusselt number and a 42.9 % improvement in total efficiency compared to the finless design. Design 2 (with an attack angle of 120°, vertical spacing of 175.650 μm, and horizontal spacing of 200 μm) focused on only maximizing heat transfer, resulting in a 109.28 % increase in the Nusselt number and a 27.1 % improvement in total efficiency. A multi-objective optimization process was conducted in response to the need to balance these multiple objectives. The TOPSIS analysis and Pareto fronts for the Nusselt number and pressure drop were generated to provide a comprehensive framework for designing an efficient and practical microchannel heat sink.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"68 ","pages":"Article 105936"},"PeriodicalIF":6.4,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143508862","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}