{"title":"圆形和方形前缘板上的非定常流动和传热特性","authors":"Channarong Wantha","doi":"10.36963/ijtst.2023100202","DOIUrl":null,"url":null,"abstract":"The influences of the shape of the leading edge of the upstream plate on the transition region from steady laminar flow to unsteady flow, as well as the heat transfer from these leading edges, were numerically studied. The calculations were performed using the finite volume method in two-dimensional domains in a low Reynolds number regime with a constant incoming flow. The results show that von Kármán vortex shedding patterns start behind the rounded upstream plate at a low Reynolds number of 114. When the leading edge of the upstream plate is square, the plate experiences flow separation and the flow become unsteady at higher Reynolds numbers of around 400. The mean Nusselt number of the upstream plate increases by approximately 179% and 213% for square and rounded leading edges, respectively, for Reynolds numbers ranging from 100 to 700.","PeriodicalId":36637,"journal":{"name":"International Journal of Thermofluid Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Unsteady flow and heat transfer characteristics over the rounded and square leading-edge plate\",\"authors\":\"Channarong Wantha\",\"doi\":\"10.36963/ijtst.2023100202\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The influences of the shape of the leading edge of the upstream plate on the transition region from steady laminar flow to unsteady flow, as well as the heat transfer from these leading edges, were numerically studied. The calculations were performed using the finite volume method in two-dimensional domains in a low Reynolds number regime with a constant incoming flow. The results show that von Kármán vortex shedding patterns start behind the rounded upstream plate at a low Reynolds number of 114. When the leading edge of the upstream plate is square, the plate experiences flow separation and the flow become unsteady at higher Reynolds numbers of around 400. The mean Nusselt number of the upstream plate increases by approximately 179% and 213% for square and rounded leading edges, respectively, for Reynolds numbers ranging from 100 to 700.\",\"PeriodicalId\":36637,\"journal\":{\"name\":\"International Journal of Thermofluid Science and Technology\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2023-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Thermofluid Science and Technology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.36963/ijtst.2023100202\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"Engineering\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Thermofluid Science and Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.36963/ijtst.2023100202","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Engineering","Score":null,"Total":0}
Unsteady flow and heat transfer characteristics over the rounded and square leading-edge plate
The influences of the shape of the leading edge of the upstream plate on the transition region from steady laminar flow to unsteady flow, as well as the heat transfer from these leading edges, were numerically studied. The calculations were performed using the finite volume method in two-dimensional domains in a low Reynolds number regime with a constant incoming flow. The results show that von Kármán vortex shedding patterns start behind the rounded upstream plate at a low Reynolds number of 114. When the leading edge of the upstream plate is square, the plate experiences flow separation and the flow become unsteady at higher Reynolds numbers of around 400. The mean Nusselt number of the upstream plate increases by approximately 179% and 213% for square and rounded leading edges, respectively, for Reynolds numbers ranging from 100 to 700.