KeWei Song , QiuXia Yang , Kai Sun , Xiang Wu , Qiang Zhang , QingZhi Hou
{"title":"在圆管-翅片热交换器中采用带有椭圆形凹陷突起的新型翅片结构提高性能","authors":"KeWei Song , QiuXia Yang , Kai Sun , Xiang Wu , Qiang Zhang , QingZhi Hou","doi":"10.1016/j.icheatmasstransfer.2024.107731","DOIUrl":null,"url":null,"abstract":"<div><p>To enhance the fin-side heat transfer capability of circle tube-fin heat exchangers, a novel fin with ellipsoidal dimple-protrusion is introduced in this paper. The effect of the ellipsoidal dimple-protrusion with five different attack angles, 0°, 10°, 20°, 30° and 40°, on the flow characteristic and heat transfer performance are numerically investigated and compared with the traditional heat transfer promoting technology by vortex generators. Both the intensity of secondary flow and heat transfer capability are significantly increased by the ellipsoidal dimple-protrusion. In comparison to the smooth channel and the channel mounted with vortex generators, the secondary flow intensity increases by up to 78.62% and 41.57%, and <em>Nu</em> increases by a maximum of 29.01% and 19.03%, respectively, in the range of <em>Re</em> for 1500–5000. The values of thermal performance factor <em>TPF</em> can reach a maximum of 1.161, which is an improvement of 16.1% compared with the smooth channel, and of 4.89% compared with the heat transfer channel with curved vortex generators. Formulas for <em>Nu</em>, <em>f</em> and <em>TPF</em> with deviations less than ±2%, ±9% and ±2% are fitted. The ellipsoidal dimple-protrusion has a superior application potentiality for heat transfer enhancement in fin-side of circle tube-fin heat exchangers.</p></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":6.4000,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Performance promotion by novel fin configurations with ellipsoidal dimple-protrusion for a circle tube-fin heat exchanger\",\"authors\":\"KeWei Song , QiuXia Yang , Kai Sun , Xiang Wu , Qiang Zhang , QingZhi Hou\",\"doi\":\"10.1016/j.icheatmasstransfer.2024.107731\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>To enhance the fin-side heat transfer capability of circle tube-fin heat exchangers, a novel fin with ellipsoidal dimple-protrusion is introduced in this paper. The effect of the ellipsoidal dimple-protrusion with five different attack angles, 0°, 10°, 20°, 30° and 40°, on the flow characteristic and heat transfer performance are numerically investigated and compared with the traditional heat transfer promoting technology by vortex generators. Both the intensity of secondary flow and heat transfer capability are significantly increased by the ellipsoidal dimple-protrusion. In comparison to the smooth channel and the channel mounted with vortex generators, the secondary flow intensity increases by up to 78.62% and 41.57%, and <em>Nu</em> increases by a maximum of 29.01% and 19.03%, respectively, in the range of <em>Re</em> for 1500–5000. The values of thermal performance factor <em>TPF</em> can reach a maximum of 1.161, which is an improvement of 16.1% compared with the smooth channel, and of 4.89% compared with the heat transfer channel with curved vortex generators. Formulas for <em>Nu</em>, <em>f</em> and <em>TPF</em> with deviations less than ±2%, ±9% and ±2% are fitted. The ellipsoidal dimple-protrusion has a superior application potentiality for heat transfer enhancement in fin-side of circle tube-fin heat exchangers.</p></div>\",\"PeriodicalId\":332,\"journal\":{\"name\":\"International Communications in Heat and Mass Transfer\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.4000,\"publicationDate\":\"2024-06-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Communications in Heat and Mass Transfer\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0735193324004937\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MECHANICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Communications in Heat and Mass Transfer","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0735193324004937","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MECHANICS","Score":null,"Total":0}
Performance promotion by novel fin configurations with ellipsoidal dimple-protrusion for a circle tube-fin heat exchanger
To enhance the fin-side heat transfer capability of circle tube-fin heat exchangers, a novel fin with ellipsoidal dimple-protrusion is introduced in this paper. The effect of the ellipsoidal dimple-protrusion with five different attack angles, 0°, 10°, 20°, 30° and 40°, on the flow characteristic and heat transfer performance are numerically investigated and compared with the traditional heat transfer promoting technology by vortex generators. Both the intensity of secondary flow and heat transfer capability are significantly increased by the ellipsoidal dimple-protrusion. In comparison to the smooth channel and the channel mounted with vortex generators, the secondary flow intensity increases by up to 78.62% and 41.57%, and Nu increases by a maximum of 29.01% and 19.03%, respectively, in the range of Re for 1500–5000. The values of thermal performance factor TPF can reach a maximum of 1.161, which is an improvement of 16.1% compared with the smooth channel, and of 4.89% compared with the heat transfer channel with curved vortex generators. Formulas for Nu, f and TPF with deviations less than ±2%, ±9% and ±2% are fitted. The ellipsoidal dimple-protrusion has a superior application potentiality for heat transfer enhancement in fin-side of circle tube-fin heat exchangers.
期刊介绍:
International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.