{"title":"矩形波翅型紊流器在空气加热器中的强化传热研究","authors":"Shiva Kumar, Nitesh Kumar","doi":"10.5098/hmt.19.10","DOIUrl":null,"url":null,"abstract":"In the present study, the use of wavy fin turbulators on the annulus body of a double pipe air heater has been numerically investigated. The inner pipe consists of hot water whereas the annular section consists of cold air whose Reynolds Number (Re) ranged from 3000-15,000. Rectangular cross-sectioned wavy fin turbulators with various curvature ratios of 2, 3, 5, and 7.5 is numerically simulated to investigate the influence of curvature effects on turbulence. Results have been compared with the bare pipe and with rectangular straight fins. It is seen that wavy fin turbulators perform better (compared to (other two) bare and rectangular straight fin) than both of them by creating turbulence effects in the flow field. Nusselt number (Nu) is increased by 256% and 51% as compared to bare and rectangular straight fin type. Parametric studies revealed that as the curvature ratio (CR) is reduced, the turbulent intensity and turbulent kinetic energy increase with better heat transfer characteristics. The highest Thermo hydraulic performance index of 4.8 is noticed for the CR of 2 at a Re of 6000 and is 34% higher than the straight rectangular fin.","PeriodicalId":46200,"journal":{"name":"Frontiers in Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":1.1000,"publicationDate":"2022-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"STUDY ON HEAT TRANSFER AUGMENTATION IN AN AIR HEATER USING RECTANGULAR WAVY FIN TURBULATORS\",\"authors\":\"Shiva Kumar, Nitesh Kumar\",\"doi\":\"10.5098/hmt.19.10\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"In the present study, the use of wavy fin turbulators on the annulus body of a double pipe air heater has been numerically investigated. The inner pipe consists of hot water whereas the annular section consists of cold air whose Reynolds Number (Re) ranged from 3000-15,000. Rectangular cross-sectioned wavy fin turbulators with various curvature ratios of 2, 3, 5, and 7.5 is numerically simulated to investigate the influence of curvature effects on turbulence. Results have been compared with the bare pipe and with rectangular straight fins. It is seen that wavy fin turbulators perform better (compared to (other two) bare and rectangular straight fin) than both of them by creating turbulence effects in the flow field. Nusselt number (Nu) is increased by 256% and 51% as compared to bare and rectangular straight fin type. Parametric studies revealed that as the curvature ratio (CR) is reduced, the turbulent intensity and turbulent kinetic energy increase with better heat transfer characteristics. The highest Thermo hydraulic performance index of 4.8 is noticed for the CR of 2 at a Re of 6000 and is 34% higher than the straight rectangular fin.\",\"PeriodicalId\":46200,\"journal\":{\"name\":\"Frontiers in Heat and Mass Transfer\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.1000,\"publicationDate\":\"2022-09-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Frontiers in Heat and Mass Transfer\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.5098/hmt.19.10\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"THERMODYNAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Frontiers in Heat and Mass Transfer","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.5098/hmt.19.10","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"THERMODYNAMICS","Score":null,"Total":0}
STUDY ON HEAT TRANSFER AUGMENTATION IN AN AIR HEATER USING RECTANGULAR WAVY FIN TURBULATORS
In the present study, the use of wavy fin turbulators on the annulus body of a double pipe air heater has been numerically investigated. The inner pipe consists of hot water whereas the annular section consists of cold air whose Reynolds Number (Re) ranged from 3000-15,000. Rectangular cross-sectioned wavy fin turbulators with various curvature ratios of 2, 3, 5, and 7.5 is numerically simulated to investigate the influence of curvature effects on turbulence. Results have been compared with the bare pipe and with rectangular straight fins. It is seen that wavy fin turbulators perform better (compared to (other two) bare and rectangular straight fin) than both of them by creating turbulence effects in the flow field. Nusselt number (Nu) is increased by 256% and 51% as compared to bare and rectangular straight fin type. Parametric studies revealed that as the curvature ratio (CR) is reduced, the turbulent intensity and turbulent kinetic energy increase with better heat transfer characteristics. The highest Thermo hydraulic performance index of 4.8 is noticed for the CR of 2 at a Re of 6000 and is 34% higher than the straight rectangular fin.
期刊介绍：
Frontiers in Heat and Mass Transfer is a free-access and peer-reviewed online journal that provides a central vehicle for the exchange of basic ideas in heat and mass transfer between researchers and engineers around the globe. It disseminates information of permanent interest in the area of heat and mass transfer. Theory and fundamental research in heat and mass transfer, numerical simulations and algorithms, experimental techniques and measurements as applied to all kinds of current and emerging problems are welcome. Contributions to the journal consist of original research on heat and mass transfer in equipment, thermal systems, thermodynamic processes, nanotechnology, biotechnology, information technology, energy and power applications, as well as security and related topics.
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