{"title":"等温垂直板湍流自然对流的实验研究与分析","authors":"A. G. Kirdyashkin, A. A. Kirdyashkin","doi":"10.1134/S1810232823040082","DOIUrl":null,"url":null,"abstract":"<p>Turbulent natural convection at isothermal vertical plate is studied experimentally for Prandtl number Pr = 13.5–15. The results of an experimental investigation of time-averaged temperature and velocity fields as well as of shear stress and heat transfer rate in turbulent boundary layer are presented. The thickness of viscous and conduction sublayers is determined. The dependence of these thicknesses on the process parameters for Pr = 13.5–15 is found. The statistical characteristics of the turbulent boundary layer <span>\\(\\left( {\\left( {\\overline {{u}'^2} } \\right)^{1/2},\\left( {\\overline {{T}'^2} } \\right)^{1/2}} \\right)\\)</span> are obtained. According to the experimental data, the law of variation of the viscous sublayer thickness is found. The laws of variation of the thickness of dynamic and thermal boundary layers are established. The wall shear stress and the shear stress variation across the boundary layer are determined. It has been found experimentally that the flow in the outer part of the boundary layer has a jet character.</p>","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"32 4","pages":"736 - 757"},"PeriodicalIF":1.3000,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental Study and Analysis of Turbulent Natural Convection at Isothermal Vertical Plate\",\"authors\":\"A. G. Kirdyashkin, A. A. Kirdyashkin\",\"doi\":\"10.1134/S1810232823040082\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Turbulent natural convection at isothermal vertical plate is studied experimentally for Prandtl number Pr = 13.5–15. The results of an experimental investigation of time-averaged temperature and velocity fields as well as of shear stress and heat transfer rate in turbulent boundary layer are presented. The thickness of viscous and conduction sublayers is determined. The dependence of these thicknesses on the process parameters for Pr = 13.5–15 is found. The statistical characteristics of the turbulent boundary layer <span>\\\\(\\\\left( {\\\\left( {\\\\overline {{u}'^2} } \\\\right)^{1/2},\\\\left( {\\\\overline {{T}'^2} } \\\\right)^{1/2}} \\\\right)\\\\)</span> are obtained. According to the experimental data, the law of variation of the viscous sublayer thickness is found. The laws of variation of the thickness of dynamic and thermal boundary layers are established. The wall shear stress and the shear stress variation across the boundary layer are determined. It has been found experimentally that the flow in the outer part of the boundary layer has a jet character.</p>\",\"PeriodicalId\":627,\"journal\":{\"name\":\"Journal of Engineering Thermophysics\",\"volume\":\"32 4\",\"pages\":\"736 - 757\"},\"PeriodicalIF\":1.3000,\"publicationDate\":\"2023-12-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Engineering Thermophysics\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1810232823040082\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Engineering Thermophysics","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S1810232823040082","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Experimental Study and Analysis of Turbulent Natural Convection at Isothermal Vertical Plate
Turbulent natural convection at isothermal vertical plate is studied experimentally for Prandtl number Pr = 13.5–15. The results of an experimental investigation of time-averaged temperature and velocity fields as well as of shear stress and heat transfer rate in turbulent boundary layer are presented. The thickness of viscous and conduction sublayers is determined. The dependence of these thicknesses on the process parameters for Pr = 13.5–15 is found. The statistical characteristics of the turbulent boundary layer \(\left( {\left( {\overline {{u}'^2} } \right)^{1/2},\left( {\overline {{T}'^2} } \right)^{1/2}} \right)\) are obtained. According to the experimental data, the law of variation of the viscous sublayer thickness is found. The laws of variation of the thickness of dynamic and thermal boundary layers are established. The wall shear stress and the shear stress variation across the boundary layer are determined. It has been found experimentally that the flow in the outer part of the boundary layer has a jet character.
期刊介绍:
Journal of Engineering Thermophysics is an international peer reviewed journal that publishes original articles. The journal welcomes original articles on thermophysics from all countries in the English language. The journal focuses on experimental work, theory, analysis, and computational studies for better understanding of engineering and environmental aspects of thermophysics. The editorial board encourages the authors to submit papers with emphasis on new scientific aspects in experimental and visualization techniques, mathematical models of thermophysical process, energy, and environmental applications. Journal of Engineering Thermophysics covers all subject matter related to thermophysics, including heat and mass transfer, multiphase flow, conduction, radiation, combustion, thermo-gas dynamics, rarefied gas flow, environmental protection in power engineering, and many others.