文章基本信息

标题：Design of twisted tape turbulator at different entrance angle for heat transfer enhancement in a solar heater
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作者：Suvanjan Bhattacharyya ; Suvanjan Bhattacharyya ; Himadri Chattopadhyay 等
期刊名称：Beni-Suef University Journal of Basic and Applied Sciences
印刷版ISSN：2314-8535
电子版ISSN：2314-8543
出版年度：2018
卷号：7
期号：1
页码：118-126
DOI：10.1016/j.bjbas.2017.08.003
语种：English
出版社：Elsevier
摘要：Highlights•Computational heat transfer and fluid flow analysis of twisted tape type turbulence promoter in a tubular heat exchanger is presented for all flow regimes.•The novel design of twisted tape with different entrance angle is presented.•The computational friction factor and Nusselt number data for laminar-to-transition-to-turbulent flow is presented.•Results are useful for the design of solar thermal heaters and heat exchangers.AbstractNumerical investigation of heat transfer characteristics in a tube fitted with inserted twisted tape swirl generator is performed. The twisted tapes are separately inserted from the tube wall. The configuration parameters include the, entrance angle (α) and pitch (H). Investigations have been done in the range of α=180°, 160° and 140° with Reynolds number varying between 100 and 20,000. In this paper, transition – SST model which can predict the transition of flow regime from laminar through intermittent to turbulent has been utilized for numerical simulations. The computational results are in good agreement with experimental data. The results show that higher entrance angle yields a higher heat transfer value. The using of single twist twisted tape supplies considerable increase on heat transfer and pressure drop when compared with the conventional twisted tapes. A large data set has been generated for heat transfer and thermal-hydraulic performance which is useful for the design of solar thermal heaters and heat exchangers.
关键词：Heat transfer;Enhancement;Twisted tape;Entrance angle;Turbulent flow