Journal of Thermal Engineering最新文献_第4页

Predicting heat transfer performance of Fe3O4-Cu/water hybrid nanofluid under constant magnetic field using ANN 恒磁场作用下Fe3O4-Cu/water杂化纳米流体传热性能的神经网络预测

IF 1.1

Journal of Thermal Engineering Pub Date : 2023-05-22 DOI: 10.18186/thermal.1300854

Edip Taşkesen, Mahmut Dirik, Mutlu Tekir, Hayati Kadir Pazarlıoğlu

{"title":"Predicting heat transfer performance of Fe3O4-Cu/water hybrid nanofluid under constant magnetic field using ANN","authors":"Edip Taşkesen, Mahmut Dirik, Mutlu Tekir, Hayati Kadir Pazarlıoğlu","doi":"10.18186/thermal.1300854","DOIUrl":"https://doi.org/10.18186/thermal.1300854","url":null,"abstract":"In this study, the experimental results using mono (Fe3O4/water and Cu/water) and hybrid (Fe3O4-Cu/water) type nanofluid with nanoparticle volume concentrations of (0≤φ≤0.02) under laminar flow conditions (994≤Re≤2337) were compared with the results obtained by ANN. While the Reynolds number (Re), hydraulic diameter (Dh), thermal conductivity (k) of working fluid, and volume concentration of the nanoparticles (φ) were selected as input layers, the Nusselt number (Nu) were considered as output layers. The %75 of the findings obtained from experiments were used to train Artificial Neural Network (ANN). The estimated data by ANN is in perfect agreement with the experimental data. The success of ANN was deter-mined by comparing it with SVM, Dec Tree, and their variations. Mean square error (MSE), root mean square error (RMSE), R-sq (R2), and mean absolute error (MEA) were considered in evaluating the results obtained. According to findings, MAE 0.00088274, MSE 1.4106e-06, RMSE 0.0011877 and R2 1.00 were measured. These findings show that the use of ANN is a feasible way to predict the convective heat transfer performance of hybrid nanofluid under a magnetic field (MF).","PeriodicalId":45841,"journal":{"name":"Journal of Thermal Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45425104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Statistical analysis of the solar diffuse fraction radiation using regression analysis of longitudinal data in India 利用印度纵向数据的回归分析对太阳散射部分辐射的统计分析

IF 1.1

Journal of Thermal Engineering Pub Date : 2023-05-22 DOI: 10.18186/thermal.1300542

Hicham Salhi, Abdelmounaim Hadjira, B. Jamil

引用次数: 0

Simultaneous estimation of reference temperature and heat transfer coefficient in transient film cooling problems 瞬态膜冷却问题中参考温度和传热系数的同时估计

Journal of Thermal Engineering Pub Date : 2023-05-19 DOI: 10.18186/thermal.1332543

Vashista ADEMANE, Ravikiran KADOLI, Vijaykumar HINDASAGERI

{"title":"Simultaneous estimation of reference temperature and heat transfer coefficient in transient film cooling problems","authors":"Vashista ADEMANE, Ravikiran KADOLI, Vijaykumar HINDASAGERI","doi":"10.18186/thermal.1332543","DOIUrl":"https://doi.org/10.18186/thermal.1332543","url":null,"abstract":"This paper aims to simultaneously estimate the reference temperature and heat transfer coefficient in film cooling situations from transient temperature measurements. The exist-ing steady-state technique is a tedious process and employs distinct boundary conditions to evaluate each parameters of the film cooling. Applying different boundary conditions may lead to errors in the estimated parameters due to differences in aerodynamic condi-tions. On the other hand, a transient technique can estimate both parameters in a single test by utilizing short-duration transient temperature data. Hence, the present study uses a novel approach for solving transient film cooling problems based on the inverse heat con-duction approach, which can simultaneously estimate heat transfer coefficient and refer-ence temperature. The present method employs an optimization technique known as the Levenberg-Marquardt Algorithm. The objective function for the inverse algorithm is con-structed using the analytical solution of a transient one-dimensional semi-infinite body. The transient surface temperature data required for the present analysis is obtained through a numerical simulation of film cooling arrangement over a flat surface. Laterally averaged effectiveness and heat transfer coefficient for blowing ratios of 0.5, 0.8, and 1.0 are analyzed using the present technique and compared against the steady-state simulation results to demonstrate the methodology. An average deviation of around 7% for the estimated effec-tiveness and 4% for the heat transfer coefficient values are observed between the present IHCP method and the steady state simulation results. The deviation in heat transfer coeffi-cient predominately occurred near the film hole exit of x/d < 5, which might have occurred due to the conjugate solution employed in the present work.","PeriodicalId":45841,"journal":{"name":"Journal of Thermal Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135673896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exergetic efficiency prediction of roughened solar air heater 粗化太阳能空气加热器的火用效率预测

IF 1.1

Journal of Thermal Engineering Pub Date : 2023-05-18 DOI: 10.18186/thermal.1299177

Karmveer Karmveer, N. Gupta, Tabish Alam, Himanshu Singh

{"title":"Exergetic efficiency prediction of roughened solar air heater","authors":"Karmveer Karmveer, N. Gupta, Tabish Alam, Himanshu Singh","doi":"10.18186/thermal.1299177","DOIUrl":"https://doi.org/10.18186/thermal.1299177","url":null,"abstract":"Energy losses of flowing air through solar air heater (SAH) duct does not consider in the ther-mal performance. Therefore, thermohydraulic performance based on exergetic efficiencies is a tool to assess the performance by considering energy losses in propelling the air simul-taneously to identify the best ribs configuration. This paper presents the thermohydraulic performance of SAHs exploiting various ribs roughness’s. The performance of SAHs is based exergetic evaluation based on IInd law of efficiency is most suitable for design of artificial-ly roughened SAH as it includes both requirement of pumping power and effective energy output. In this paper exergetic evaluation of differently roughened SAH has been done. The exergy efficiency of roughened SAH was calculated analytically with the help of correlations developed by researchers and the results also compared with conventional SAH under same operating parameters. The thermal and exergy efficiency curve as a function of temperature rise parameter (ΔT/I) has been plotted. As a results, hybrid ribs configuration exhibited the highest exergetic efficiencies when temperature rise parameters greater than 0.01 K.m/W, however, smooth duct also showed a significant exergetic efficiency when temperature rise parameters had low values.","PeriodicalId":45841,"journal":{"name":"Journal of Thermal Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46479132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Designing of system for high grade heat recovery in thermal coolingsystem for process heat applications 用于工艺热应用的热冷却系统中的高级热回收系统的设计

IF 1.1

Journal of Thermal Engineering Pub Date : 2023-05-18 DOI: 10.18186/thermal.1299161

Alka Solanki, Yash Pal

引用次数: 0

Simultaneous estimation of reference temperature and heat transfer coefficient in transient film cooling problems 瞬态膜冷却问题中参考温度和传热系数的同时估计

IF 1.1

Journal of Thermal Engineering Pub Date : 2023-05-18 DOI: 10.18186/thermal.1299150

Vashist Ademane, R. Kadoli, V. Hindasageri

{"title":"Simultaneous estimation of reference temperature and heat transfer coefficient in transient film cooling problems","authors":"Vashist Ademane, R. Kadoli, V. Hindasageri","doi":"10.18186/thermal.1299150","DOIUrl":"https://doi.org/10.18186/thermal.1299150","url":null,"abstract":"This paper aims to simultaneously estimate the reference temperature and heat transfer coefficient in film cooling situations from transient temperature measurements. The exist-ing steady-state technique is a tedious process and employs distinct boundary conditions to evaluate each parameters of the film cooling. Applying different boundary conditions may lead to errors in the estimated parameters due to differences in aerodynamic condi-tions. On the other hand, a transient technique can estimate both parameters in a single test by utilizing short-duration transient temperature data. Hence, the present study uses a novel approach for solving transient film cooling problems based on the inverse heat con-duction approach, which can simultaneously estimate heat transfer coefficient and refer-ence temperature. The present method employs an optimization technique known as the Levenberg-Marquardt Algorithm. The objective function for the inverse algorithm is con-structed using the analytical solution of a transient one-dimensional semi-infinite body. The transient surface temperature data required for the present analysis is obtained through a numerical simulation of film cooling arrangement over a flat surface. Laterally averaged effectiveness and heat transfer coefficient for blowing ratios of 0.5, 0.8, and 1.0 are analyzed using the present technique and compared against the steady-state simulation results to demonstrate the methodology. An average deviation of around 7% for the estimated effec-tiveness and 4% for the heat transfer coefficient values are observed between the present IHCP method and the steady state simulation results. The deviation in heat transfer coeffi-cient predominately occurred near the film hole exit of x/d < 5, which might have occurred due to the conjugate solution employed in the present work.","PeriodicalId":45841,"journal":{"name":"Journal of Thermal Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44997886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flow of viscous nanofluids across a non-linear stretching sheet 粘性纳米流体在非线性拉伸薄片上的流动

Journal of Thermal Engineering Pub Date : 2023-05-17 DOI: 10.18186/thermal.1332594

Pradyumna Kumar PATTNAIK, Shoeb Ahmed SYED, Sujogya MISHRA, Swarnalata JENA, Sachindar Kumar ROUT, Kamalakanta MUDULI

{"title":"Flow of viscous nanofluids across a non-linear stretching sheet","authors":"Pradyumna Kumar PATTNAIK, Shoeb Ahmed SYED, Sujogya MISHRA, Swarnalata JENA, Sachindar Kumar ROUT, Kamalakanta MUDULI","doi":"10.18186/thermal.1332594","DOIUrl":"https://doi.org/10.18186/thermal.1332594","url":null,"abstract":"This article aims to demonstrate the flow of viscous nanofluid over a non-linear stretching sheet. Considering thermal radiation and dissipative heat in the heat transport phenomenon encourages the flow properties. In generally, nanofluids are employed in heat transfer equip-ment because they improve the thermal characteristics of coolants present in the equipment. Additionally, these fluids possess unique features that have the potential to be applied in a variety of applications, such as pharmaceutical procedures, hybrid power engines, household refrigerators, grinding, and microchips, among others. Consequently, the current model is built to allow for the optimal selection of thermophysical parameters such as conductivity and viscosity, which will enhance the overall effectiveness of the study. Appropriate transfor-mation rules have been used to modify the highly non-linear PDEs into a couple of highly non-linear ODEs. An efficient built-in MATLAB bvp5C algorithm addresses the boundary value problem under consideration. Using the dimensionless parameters assumed in the prob-lem, changes in the velocity as well as the temperature profiles are shown, and rate coefficients, by using numerical simulations are also employed in tabular form. The important outcomes which are exposed in the study are; that the particle concentration is used as a controlling pa-rameter to reduce the nanofluid velocity, whereas it favours enhancing the fluid temperature and the radiating heat along with the coupling parameter due to the inclusion of dissipative heat also encourages to overshoot the temperature profile.","PeriodicalId":45841,"journal":{"name":"Journal of Thermal Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135916736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of exergetic performance and payback period of organic rankine cycle integrated vapor compression refrigeration system based on exergy, economic, and environmental criteria 基于火用、经济和环境标准的有机朗肯循环集成蒸汽压缩制冷系统的火用性能和投资回收期优化

IF 1.1

Journal of Thermal Engineering Pub Date : 2023-05-16 DOI: 10.18186/thermal.1297571

Ashwni Goyal, A. F. Sherwani

{"title":"Optimization of exergetic performance and payback period of organic rankine cycle integrated vapor compression refrigeration system based on exergy, economic, and environmental criteria","authors":"Ashwni Goyal, A. F. Sherwani","doi":"10.18186/thermal.1297571","DOIUrl":"https://doi.org/10.18186/thermal.1297571","url":null,"abstract":"In this paper, a multi-objective optimization study is carried out to determine the optimal exergetic performance (𝜂𝑒𝑥) and the payback period (PB) of the organic Rankine cycle (ORC) integrated vapor compression refrigeration (VCR) system based on exergy, economic, and environmental criteria using non-dominated sort genetic algorithm-II (NSGA-II). Moreover, a sensitivity analysis is carried out to improve the exergetic performance of the system. The working fluid, the pinch-point temperature difference of the ORC evaporator (ΔToep ), con-denser (ΔTpcond), and the VCR evaporator (ΔTpve), cooling water inlet temperature (Tcw1), chilled fluid temperature (Tcf2), and heat-source inlet temperature (Th1) are taken as the decision vari-ables. The results of this study indicate that butane is the most suitable working fluid for op-timal exergetic efficiency, 𝜂𝑒𝑥 (33.7%) and payback period, PB (4.9 years) of the system. The optimal values of other decision variables such as Th1, Tcw1, Tcf2, ΔToep , ΔTpve , and ΔTpcondare 378 K, 313 K, 276 K, 10 K, 5 K, and 5 K respectively.","PeriodicalId":45841,"journal":{"name":"Journal of Thermal Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49004785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Drying investigation of coriander seeds in a photovoltaic thermal collector with solar dryer 香菜种子在太阳能光伏集热器中的干燥研究

IF 1.1

Journal of Thermal Engineering Pub Date : 2023-05-16 DOI: 10.18186/thermal.1297575

B. Srimanickam, Sunil Kumar

引用次数: 0

Assessment of ec-toxicity potential of fuel by exhaust gas analysis 用废气分析评价燃料的电毒性

Journal of Thermal Engineering Pub Date : 2023-05-16 DOI: 10.18186/thermal.1297582

Aezeden MOHAMED, Sachindra Kumar ROUT, Kamalakanta MUDULI

引用次数: 0