Case Studies in Thermal Engineering最新文献

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Broadband high thermal radiation nanoscale near-perfect solar energy metamaterial for thermal applications 宽带高热辐射纳米级近乎完美的太阳能热应用超材料
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106121
Ammar Armghan, Khaled Aliqab, Meshari Alsharari
{"title":"Broadband high thermal radiation nanoscale near-perfect solar energy metamaterial for thermal applications","authors":"Ammar Armghan,&nbsp;Khaled Aliqab,&nbsp;Meshari Alsharari","doi":"10.1016/j.csite.2025.106121","DOIUrl":"10.1016/j.csite.2025.106121","url":null,"abstract":"<div><div>Metamaterials designed with nanostructures can effectively convert solar energy into thermal energy, facilitating various applications such as photovoltaic systems, energy harvesting, and thermal applications. This study investigates a periodic array of square-shaped nickel nanostructures metasurface aimed at optimizing solar radiation capture, resulting in an aggregate absorption rate of 98 % within 400–8000 nm range. This broadband absorption results from the localized surface plasmon resonance phenomenon. The proposed device shows a near perfect matching with the solar power radiation AM 1.5 model curve, achieving a solar absorption rate of above 98 %. Moreover, the proposed device shows excellent performance under the blackbody thermal radiation curve with a high thermal radiation efficiency of 95 % at 873 K. Further attributes of the proposed device include hardiness to different light wave polarization conditions and incident angles. Additionally, we have verified the broadband high absorption characteristics through an examination of impedance matching theory, in sighting the distribution of electric field within its structure and impact on the absorption rate with the variation in the different parameters of the unit cell. The findings indicate that the proposed structure exhibits potential for industrial and commercial applications including photovoltaic system, energy harvesting and thermal applications.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"71 ","pages":"Article 106121"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852172","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}
引用次数: 0
Techno-economic analysis of a hybrid thermal desalination system integrated with a PVT collector 结合PVT集热器的混合热脱盐系统技术经济分析
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106155
S. Rajesh , C. Chiranjeevi , Saboor Shaik , Pethurajan Vigneshwaran , Fayaz Hussain , C Ahamed Saleel , Asif Afzal
{"title":"Techno-economic analysis of a hybrid thermal desalination system integrated with a PVT collector","authors":"S. Rajesh ,&nbsp;C. Chiranjeevi ,&nbsp;Saboor Shaik ,&nbsp;Pethurajan Vigneshwaran ,&nbsp;Fayaz Hussain ,&nbsp;C Ahamed Saleel ,&nbsp;Asif Afzal","doi":"10.1016/j.csite.2025.106155","DOIUrl":"10.1016/j.csite.2025.106155","url":null,"abstract":"<div><div>Sustainable societies will require innovative technical solutions to fulfil the mounting demand for water and energy to support urban lifestyles. Meeting the challenges of the water-energy nexus requires the implementation of sustainable technologies such as photovoltaics, solar desalination, and their integrated solutions, to meet a growing demand. The novelty of the present work is to utilizing the waste heat in proposed photovoltaic thermal (PVT) based hybrid desalination system with a step-wise solar still (SSS) and humidification-dehumidification (HD) desalination is being studied with an emphasis on life cycle assessment and techno-economic analysis of the proposed configuration. Life cycle studies reveal that the average energy production factor (EPF) is 14.84, the average life cycle conversion efficiency (LCCE) is 72.82 % over a 25-year life span, and the energy payback time (EPBT) is about 1.9 years on an energy basis with an average thermal efficiency of 77.72 %. The significance of hybrid systems for sustainable development has been highlighted, along with the possibility of 4.53 tons of CO<sub>2</sub> reduction and 389.58 USD in carbon credits that can be obtained annually for a typical solar radiation of 610 W/m<sup>2</sup> by deploying this hybrid system.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"71 ","pages":"Article 106155"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873117","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}
引用次数: 0
Structural and thermal properties of Alkali-treated biomass fibers and W. robusta waste reinforced PLA hybrid biocomposites 碱处理生物质纤维和木犀草废增强聚乳酸杂化生物复合材料的结构和热性能
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106170
Isma Dembri , Ahmed Belaadi , Abdelaziz Lekrine , Messaouda Boumaaza , Mohammad Jawaid , Ahmad Safwan Ismail , Djamel Ghernaout
{"title":"Structural and thermal properties of Alkali-treated biomass fibers and W. robusta waste reinforced PLA hybrid biocomposites","authors":"Isma Dembri ,&nbsp;Ahmed Belaadi ,&nbsp;Abdelaziz Lekrine ,&nbsp;Messaouda Boumaaza ,&nbsp;Mohammad Jawaid ,&nbsp;Ahmad Safwan Ismail ,&nbsp;Djamel Ghernaout","doi":"10.1016/j.csite.2025.106170","DOIUrl":"10.1016/j.csite.2025.106170","url":null,"abstract":"<div><div>The aim of this study to develop biodegradable composites by using agricultural biowaste that well qualified to be used in various applications. They are an outstanding choice for the production of sports equipment, green building materials, and car interior components due to their transport and recycling capabilities. In this work, hybrid biocomposites are fabricated from a Poly lactic acid (PLA) matrix reinforced with alkali-treated Robusta (Rb) short biomass palm fibers and biochar (B) were characterized. Scanning electron microscopy showed a decrease in the interfacial spaces of the treated reinforcement materials compared to the untreated ones, becoming less frequent and smaller. The Rb-reinforced biocomposite treated with 3 % NaOH (PLA-BRb3) showed better viscoelastic behavior, with high energy storage and loss moduli and minimal damping factor (tan δ), showing high elasticity and low glass transition temperature. The loss and storage moduli reached 516 MPa and 2463.64 MPa, respectively, suggesting excellent energy dissipation and enhanced damping capacity, ideal for shock and vibration resistance applications. Tan δ decreased to 0.97, making it the most elastic material in the study. The qualities of these green biocomposites could be improved and their uses could be extended to various sustainable production sectors through further research and development.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"70 ","pages":"Article 106170"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852095","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}
引用次数: 0
A study on temperature, relative humidity, and energy consumption in long-distance trains air conditioning systems in Indonesia 印尼长途列车空调系统的温度、相对湿度和能耗研究
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106122
Fathurrahman Yudhi , Muhammad Idrus Alhamid , Nandy Putra , Arnas Lubis
{"title":"A study on temperature, relative humidity, and energy consumption in long-distance trains air conditioning systems in Indonesia","authors":"Fathurrahman Yudhi ,&nbsp;Muhammad Idrus Alhamid ,&nbsp;Nandy Putra ,&nbsp;Arnas Lubis","doi":"10.1016/j.csite.2025.106122","DOIUrl":"10.1016/j.csite.2025.106122","url":null,"abstract":"<div><div>Trains are efficient and cost-effective means of public transportation capable of carrying large groups of passengers. The Heating, Ventilation, and Air Conditioning (HVAC) system, a significant component with substantial energy usage in train operations, often encounters issues due to problems with the HVAC system failing to provide comfortable air quality, ultimately impacting passenger satisfaction and posing concerns for operators. A significant disparity in understanding of HVAC systems on Indonesian trains is frequently observed in tropical regions, where ensuring good air quality, stable temperatures, and controlled relative humidity levels over extended periods poses unique challenges due to the typically hot and humid climate characterized by high external temperatures and fluctuating humidity levels. Therefore, this study aimed to evaluate the ability of HVAC systems to maintain temperature and humidity in trains. Temperature and humidity were measured during the journey at various areas in passenger compartments in three executive class intercity trains, covering both day and night conditions. The results showed that maintaining a consistent level of thermal comfort parameters throughout the journey was challenging for HVAC systems. Data suggests that temperature fluctuations took place during the daytime, whereas relative humidity (R.H) levels in the night and early morning rose to 28.2 °C and 81.2 % respectively, surpassing the established standards ISO 19659–2 of 27 °C for temperature and 65 % percent for relative humidity. These results were expected to guide the improvement of future HVAC systems designs, enhancing their ability to maintain consistent temperature under varying conditions. Additionally, the designs would focus on better humidity control through the incorporation of a reheating process in air supply, ensuring consistency of long-distance journey.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"71 ","pages":"Article 106122"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852173","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}
引用次数: 0
MHD couple stress boundary-layer flow with heat and mass transfer under thermal radiation and Marangoni effect: A numerical study 热辐射和Marangoni效应下MHD耦合应力边界层传热传质流动的数值研究
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106159
Jawali C. Umavathi , Bernardo Buonomo , Oronzio Manca , Mikhail A. Sheremet
{"title":"MHD couple stress boundary-layer flow with heat and mass transfer under thermal radiation and Marangoni effect: A numerical study","authors":"Jawali C. Umavathi ,&nbsp;Bernardo Buonomo ,&nbsp;Oronzio Manca ,&nbsp;Mikhail A. Sheremet","doi":"10.1016/j.csite.2025.106159","DOIUrl":"10.1016/j.csite.2025.106159","url":null,"abstract":"<div><div>This research deals with the investigation of radiative boundary-layer flow of couple stress nanofluids under the Marangoni effect in terms of heat and mass transfer. The approach also takes into account the effects of cross diffusion and magnetic field. Additionally, the study of the nanoparticle interfacial layer features under an appropriate nanofluid model has been performed. Using similarity transformation, the mathematical issue is transformed to ordinary differential equations, that are then numerically resolved applying MATLAB solver bvp5c. Utilizing the Response Surface Methodology, the face-centered Central Composite Design is used as the foundation for the optimization process. The flow fields with nanolayer and without it are compared. For interacting effects, the system external constraining factors, such as the couple stress parameter, magnetic field, thermal radiation, Dufour, Schmidt and Soret numbers has been investigated. The heat and mass transfer sensitivity is closely examined. Through graphical representations, the flow fields embedded dimensionless parameters are investigated. The interfacial layer aspect leads to an enhanced magnitude of the temperature field whereas the effect on the concentration profile is negligible. The inclination of the magnetic field augments the flow profiles significantly. Further, the velocity increases near the boundary and then reverses its direction at the free stream for increment in the couple stress characteristic. The temperature and concentration are enhanced for large values of couple stress parameter.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"71 ","pages":"Article 106159"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143873115","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}
引用次数: 0
Enhancement of diesel engine performance and emission reduction using ZnS nanoparticles and water emulsions with electrostatic precipitator integration ZnS纳米颗粒与水乳液结合静电除尘器提高柴油机性能和减排效果
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106157
Bassam S. Aljohani , Khalid Aljohani , Muralidharan Kandasamy , Suresh Vellaiyan , Beemkumar Nagappan
{"title":"Enhancement of diesel engine performance and emission reduction using ZnS nanoparticles and water emulsions with electrostatic precipitator integration","authors":"Bassam S. Aljohani ,&nbsp;Khalid Aljohani ,&nbsp;Muralidharan Kandasamy ,&nbsp;Suresh Vellaiyan ,&nbsp;Beemkumar Nagappan","doi":"10.1016/j.csite.2025.106157","DOIUrl":"10.1016/j.csite.2025.106157","url":null,"abstract":"<div><div>This study explores a novel approach to enhancing water-emulsified diesel fuel by incorporating zinc sulfide (ZnS) nanoparticles and mitigating particulate matter (PM) emissions through a single-stage electrostatic precipitator (ESP). Water was blended with plain diesel fuel (PDF) at varying concentrations (5 %, 10 %, and 15 %), with ZnS nanoparticles (100 ppm) specifically introduced into the 15 % water-emulsified fuel to stabilize combustion. Performance and combustion characteristics were evaluated using a single-cylinder diesel engine, while emissions were analyzed before and after ESP treatment. Results indicate that up to 10 % water-emulsified fuel improves performance and reduces emissions, but higher water content negatively impacts combustion. The inclusion of ZnS nanoparticles in 15 % water-emulsified fuel counteracted these drawbacks, maintaining stable performance similar to the 10 % blend. While oxides of nitrogen (NOx), hydrocarbon (HC), and carbon monoxide (CO) emissions decreased by 2.5 %, 5.9 %, and 6.1 %, respectively, PM emissions increased by 7.7 % due to nanoparticle-induced combustion dynamics. However, integrating ESP effectively reduced PM emissions by 74.2 % with minimal influence on other exhaust pollutants. This study provides a comprehensive fuel modification and post-combustion control strategy, bridging critical gaps in sustainable diesel combustion technology.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"71 ","pages":"Article 106157"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852171","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}
引用次数: 0
Experimental analysis on the effect of multi-level array hollow semi-stadium fins (HSSF) and baffles on solar thermal air collector 多层阵列中空半体育场翅片和挡板对太阳热风集热器影响的实验分析
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106165
Muhammad Aqil Afham Rahmat , Adnan Ibrahim , Khaled M. Al-Aribe , Muhammad Ubaidah Syafiq Bin Mustaffa , Ihsan Okta Harmailil , Sahibzada Imad Ud Din
{"title":"Experimental analysis on the effect of multi-level array hollow semi-stadium fins (HSSF) and baffles on solar thermal air collector","authors":"Muhammad Aqil Afham Rahmat ,&nbsp;Adnan Ibrahim ,&nbsp;Khaled M. Al-Aribe ,&nbsp;Muhammad Ubaidah Syafiq Bin Mustaffa ,&nbsp;Ihsan Okta Harmailil ,&nbsp;Sahibzada Imad Ud Din","doi":"10.1016/j.csite.2025.106165","DOIUrl":"10.1016/j.csite.2025.106165","url":null,"abstract":"<div><div>An energy crisis is caused by the world's population expansion and growing energy consumption by global civilization, which encourages the usage of renewable energy technologies such as solar thermal collectors. Inefficient heat transmission lowers energy conversion and collector performance. This research aims to utilize a multi-level array of hollow semi-stadium fins (HSSF) with baffles to evaluate experimentally the double-pass solar air collector energy utilization. The proposed collectors with baffles and 1:2 and 1:4 multi-level spacing gaps are compared to the flat plate design at mass flow rates of 0.01–0.08 kg/s and irradiances of 400–800 W/m<sup>2</sup>. The experimental findings are verified with numerical and previously experimental studies. The findings indicated that the newly double-pass solar collector achieved a maximum thermal efficiency of 77.70 % at 800 W/m<sup>2</sup>, the highest useful energy of 934.83 Watts, and the highest enhancement efficiency of 30.67 %, indicating better performance than the flat plate design. Optimal efficiency was found at flow rates of 0.04 kg/s (400 W/m<sup>2</sup>) and 0.07 kg/s (600–800 W/m<sup>2</sup>). Increasing mass flow rates reduces friction factors while raising pressure drops. Validation with numerical results contains a 0.67–4.96 % error. Field-based experimental research, exergy and thermohydraulic studies, and economic and environmental studies are recommended to evaluate the design's effectiveness and feasibility.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"71 ","pages":"Article 106165"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852155","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}
引用次数: 0
Significance of thermal conductivity and variable density on heat and mass transfer of MHD second-grade nanofluid along high-temperature polymer surface 导热系数和变密度对MHD二级纳米流体沿高温聚合物表面传热传质的影响
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106168
Nidhal Ben Khedher , Zia Ullah , Md Mahbub Alam , Saleh Al Arni , Isam Elbadawi , O.D. Makinde , Mohamed Boujelbene
{"title":"Significance of thermal conductivity and variable density on heat and mass transfer of MHD second-grade nanofluid along high-temperature polymer surface","authors":"Nidhal Ben Khedher ,&nbsp;Zia Ullah ,&nbsp;Md Mahbub Alam ,&nbsp;Saleh Al Arni ,&nbsp;Isam Elbadawi ,&nbsp;O.D. Makinde ,&nbsp;Mohamed Boujelbene","doi":"10.1016/j.csite.2025.106168","DOIUrl":"10.1016/j.csite.2025.106168","url":null,"abstract":"<div><div>The novelty of current research is to investigate exponential thermal density and thermal conductivity effect on heat-mass transmission in second-grade magneto nanofluid along stretching surface with thermal-solutal slip boundary conditions. The well define similarity transformation is applied on the couple of partial differential equations (PDEs) to transform into ordinary differential equations (ODEs). The Newton-Raphson and central difference technique is used to linearize these equations. Using MATLAB software technique, the results in graphical and numerical form are explored. The impact of various variables on fluid velocities, fluid temperatures and nanoparticle concentrations profiles are found graphically and numerically including, variable thermal conductivity, magnetic field, second-grade nanofluid factor, thermal slip, and concentration slip. The value of Nusselt number, Sherwood number and skin friction are found numerically for Prandtl number, density index, and thermophoretic factor. For asymptotic numerical outcomes, the following range of parameters such <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>n</mi><mo>≤</mo><mn>1.4</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>N</mi><mi>t</mi><mo>≤</mo><mn>1.2</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>N</mi><mi>b</mi><mo>≤</mo><mn>2.0</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>ξ</mi><mo>≤</mo><mn>6.0</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>λ</mi><mo>≤</mo><mn>14.0</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><msub><mi>λ</mi><mn>1</mn></msub><mo>≤</mo><mn>8.0</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>α</mi><mo>≤</mo><mn>0.8</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>Pr</mi><mo>≤</mo><mn>10.0</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>L</mi><mi>e</mi><mo>≤</mo><mn>3.5</mn></mrow></math></span>, <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>B</mi><mi>t</mi><mo>≤</mo><mn>4.0</mn></mrow></math></span>, and <span><math><mrow><mn>0.1</mn><mo>≤</mo><mi>B</mi><mi>c</mi><mo>≤</mo><mn>5.0</mn></mrow></math></span> is used. It found that the higher value of thermal conductivity and thermal-concentration slip increases the velocity profile while magnetic field decreased it. Mass transmission and Nusselt rate are increased with increasing magnetic field. The maximum Nusselt number is explored for higher thermophoresis and density parameter. The noticeable amplitude in fluid velocity profiles is observed with thermal conductivity, temperature-concentration slip and buoyancy force effects under lower fluid density.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"71 ","pages":"Article 106168"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855934","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}
引用次数: 0
CFD investigation and ANN prediction of heat transfer coefficient for fully developed turbulent air flow around double V-baffle turbulators 双 V 型障板涡轮周围完全发展湍流气流的 CFD 研究和 ANN 传热系数预测
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106096
Abdulaziz Alasiri , H.E. Fawaz
{"title":"CFD investigation and ANN prediction of heat transfer coefficient for fully developed turbulent air flow around double V-baffle turbulators","authors":"Abdulaziz Alasiri ,&nbsp;H.E. Fawaz","doi":"10.1016/j.csite.2025.106096","DOIUrl":"10.1016/j.csite.2025.106096","url":null,"abstract":"<div><div>This paper presents a numerical study of periodic fully developed turbulent airflow in a rectangular channel with double upstream V-baffles installed on the upper and lower walls of the channel in an in-line manner. Utilizing the OpenFOAM open-source software, this numerical research investigates the impact of Re from 10,000 to 40,000 and BR from 0.3 to 0.5 on flow structure and heat transfer performance. An ANN model is constructed to estimate the local heat transfer coefficient using results obtained from the current CFD simulations and utilizing axial local distance (X/P), Re, and BR as ANN input parameters. The process of training incorporates the analysis of the loss function on training and validation data for controlling the weights and biases using backpropagation while feed forward propagate the selected input parameters. A total of 11 hidden layers consisting of 24 neurons each has been used in constructing the ANN, and the training process is optimized using the ADAM algorithm to minimize the loss function. The Final layer uses the linear activation function while all the hidden layers use the rectified Linear Units Activation function (ReLU). The ANN model demonstrates excellent predictive performance, yielding values close to 1 for R<sup>2</sup> and r, along with extremely low values for MSE, MAPE, MSLE, and log-cosh loss (0.01, 0.6 %, 0.001, and 0.01, respectively), demonstrating the ANN model's high predictive accuracy.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"71 ","pages":"Article 106096"},"PeriodicalIF":6.4,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855941","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}
引用次数: 0
A hybrid Eulerian-Largrangian multiphase-thermal flow simulation of evaporative spray cooling in LNG cargo tanks 液化天然气液舱蒸发喷雾冷却的欧拉-朗日混合多相热流模拟
IF 6.4 2区 工程技术
Case Studies in Thermal Engineering Pub Date : 2025-04-17 DOI: 10.1016/j.csite.2025.106160
Gyu-Mok Jeon, Jong-Chun Park
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