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首页> 外文期刊>International Journal of Heat and Mass Transfer >A numerical study on the flow over a novel tube for heat-transfer enhancement with a linear Eddy-viscosity model
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A numerical study on the flow over a novel tube for heat-transfer enhancement with a linear Eddy-viscosity model

机译：新型涡流-粘性模型中用于增强传热的新型管内流动的数值研究

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摘要

A computational study is presented which analyzes details of the flow and heat-transfer behaviors in a novel heat-transfer-enhancement tube with a low-Reynolds number turbulence model. The tube is constructed with a series of alternative vertically and horizontally positioned oval pipes connected by transition sections, which bridge a vertically positioned cross-section to a horizontally positioned one, or vice versa. Results are presented for local as well as overall flow and heat-transfer parameters, including skin-friction coefficient and Nusselt number. It is found that the transition sections contribute most to the promotion of heat-transfer but with the penalty of producing the largest pressure drop per unit length. The geometry of the transition section tends to provoke separation bubbles, which not only attenuate local heat-transfer rate but also result in higher pressure-loss. The study demonstrates that, within the range of Reynolds numbers investigated, this new configuration can largely enhance heat-transfer from 40% to over 100% comparing to a circular pipe. However, the price is that the pressure drop caused by the former is also generally twice as much as that of the latter.
机译：提出了一个计算研究，该研究分析了具有低雷诺数湍流模型的新型传热增强管中的流动和传热行为的细节。该管由通过过渡段连接的一系列可选的垂直和水平放置的椭圆形管构成，这些椭圆形管将垂直放置的横截面桥接到水平放置的横截面，反之亦然。给出了局部以及整体流动和传热参数的结果，包括皮肤摩擦系数和Nusselt数。已发现过渡段对促进热传递的贡献最大，但具有在单位长度上产生最大压降的代价。过渡段的几何形状往往会引起分离气泡，这不仅会削弱局部传热速率，还会导致更高的压力损失。研究表明，在所研究的雷诺数范围内，与圆形管道相比，这种新配置可以将传热从40％大大提高到100％以上。但是，代价是前者造成的压降一般也要比后者造成的压降大两倍。

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