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Numerical study of heat transfer enhancement using perforated dual twisted tape inserts in converging-diverging tubes

机译：会聚-发散管中使用多孔双绞带插入件增强传热的数值研究

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摘要

In this article, a 3D numerical simulation for investigating friction factor and heat transfer enhancements in case of inserting normal or perforated dual twisted tapes (TTs) in converging-diverging tubes (CDTs) is presented. The effects of Reynolds number changing from 10,000 to 20,000 and a various number of holes (N = 0, 1, 2, and 3) in TTs, under constant uniform heat flux on tube outer wall and using water as working fluid circumstances, were examined. It was found that generally using dual TTs in CDTs improves the Nusselt number up to 9% compared to bare CDTs. Perforating TTs do not have a noticeable effect on heat transfer, but decrease the friction factor significantly, up to 396% compared to normal dual TT implantation, in higher Reynolds numbers. Following that, thermal performance factor considerably increases up to 57%, compared to CDTs with normal dual TTs. To show the mechanism of these effects, velocity streamlines are presented and will be discussed in this paper.
机译：在本文中，提出了一个3D数值模拟，用于研究在会聚发散管（CDT）中插入普通或穿孔双绞带（TT）时的摩擦系数和传热增强。研究了雷诺数从10,000更改为20,000以及在管外壁上以恒定恒定的热通量和以水为工作液的情况下，TT中各种孔（N = 0、1、2和3）的影响。 。已经发现，与裸CDT相比，在CDT中通常使用双重TT可以将Nusselt数提高多达9％。穿孔TT对传热没有明显影响，但在较高的雷诺数下，与正常的双TT植入相比，摩擦系数显着降低，高达396％。此后，与具有常规双TT的CDT相比，热性能系数显着提高了57％。为了显示这些影响的机理，提出了速度流线，并将在本文中进行讨论。

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