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首页> 外文期刊>Journal of Heat Transfer >Tapered Twisted Tape Inserts for Enhanced Heat Transfer
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Tapered Twisted Tape Inserts for Enhanced Heat Transfer

机译：锥形扭曲胶带插入件，可增强热传递

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摘要

Insertion of twisted tapes in smooth channels is one of the passive methods used for enhancing heat transfer. Flow and associated heat transfer characteristics of these channels are very complex. Understanding this complex flow is helpful while designing new passive methods. Numerical methods like computational fluid dynamics (CFD) are gaining much popularity for analyzing and designing these heat transfer enhancement techniques. This paper focuses on such a numerical study. The preliminary study is focused on development of numerical methodology through validation. Successive studies are aimed at development of an innovative design for twisted tape. Twisted tapes with taper angle (tapered twisted tapes, i.e., tape width decreases along the flow direction) are developed and evaluated on the basis of the performance of these tapes with those of conventional tapes. A circular tube with tapered twisted tape with a twist ratio of 3 and taper angles of 0.3,0.4, 0.5, 0.6, and 0.7 is considered for this study along with a plain tube. Three Reynolds numbers (Re) of 8545,11393, and 13333 are considered to examine the sensitivity of the performance. Simulations are performed with a commercially available CFD tool, ansys fluent (v14.0). Heat transfer and pressure drop results are presented in the form of Nusselt number (Nu), friction factor (f), and overall enhancement ratio (η). An increase of 17% in overall enhancement is predicted with taper angle of 0.5.
机译：将扭曲的胶带插入光滑的通道是用于增强热传递的被动方法之一。这些通道的流动和相关的传热特性非常复杂。在设计新的被动方法时，了解这种复杂的流程很有帮助。诸如计算流体动力学（CFD）之类的数值方法在分析和设计这些传热增强技术方面正变得越来越受欢迎。本文着重于这种数值研究。初步研究的重点是通过验证开发数值方法。连续的研究旨在开发用于扭曲带的创新设计。具有这些锥度角的扭曲带（锥形扭曲带，即，沿着流动方向的带宽度减小）被开发并基于这些带的性能与常规带的性能进行评估。这项研究考虑了带有锥形扭曲带的圆管，其扭曲比为3，锥角为0.3、0.4、0.5、0.6和0.7，与普通管一起使用。考虑了三个雷诺数（Re）8545、11393和13333，以检查性能的敏感性。使用市售的CFD工具ansys fluent（v14.0）进行仿真。传热和压降结果以努塞尔数（Nu），摩擦系数（f）和总增强比（η）的形式表示。锥角为0.5时，整体增强效果预计会提高17％。

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