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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical investigation on synthetical performances of fluid flow and heat transfer of semiattached rib-channels
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Numerical investigation on synthetical performances of fluid flow and heat transfer of semiattached rib-channels

机译：半连接肋通道流体流动与传热综合性能的数值研究

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摘要

Although the conventional internal ribs or turbulators can significantly improve the performances of the convective heat transfer within a channel, the added ribs can also cause two demerits, a larger friction factor and some lower heat transfer areas (LHTA) than that in the corresponding smooth channel, especially behind fully attached (solid-type) ribs and at the corners formed by bottom and side walls. This paper presents a novel design of the ribbed channel, which is here called semiattached rib-design. The ribs are perforated at the rib corners to form two rectangular holes, so a portion of the fluid can pass through the holes. The characteristics of the semiattached rib-design are numerically investigated by the commercial software Fluent 6.3 in a Reynolds number range from 10~4 to 2.5 × 10~4. Five different structures of the rib (width ratios of channel to hole) and two positions (transverse rib and 45° angled ribs) are analyzed. The numerical results show that the semiattached rib-design can significantly improve local heat transfer and fluid flow performances; the semiattached ribs with 45° angle of attack can even achieve a higher efficiency of synthetical heat transfer than that of the fully attached and detached rib-channels, at the same time eliminate the LHTA; although the average Nusselt number over a pitch in the transverse ribbed channel is lower than that of fully attached and detached rib-channels, this semiattached ribs can also fully eliminate the LHTA.
机译：尽管常规的内部肋或湍流器可以显着改善通道内对流换热的性能，但是增加的肋也可能导致两个缺点，即摩擦系数较大，并且传热面积（LHTA）比相应的平滑通道低，尤其是在完全连接的（实心型）肋骨的后面以及由底壁和侧壁形成的拐角处。本文介绍了一种带肋通道的新颖设计，在此称为半连接肋设计。肋在肋角处打孔以形成两个矩形孔，因此一部分流体可以通过这些孔。通过商业软件Fluent 6.3在10〜4到2.5×10〜4的雷诺数范围内对半连接肋设计的特征进行了数值研究。分析了肋的五种不同结构（通道与孔的宽度比）和两个位置（横向肋和45°角肋）。数值结果表明，半连接肋设计可以显着改善局部传热和流体流动性能。具有45°迎角的半连接肋比完全连接和分离的肋通道甚至可以实现更高的合成传热效率，同时消除了LHTA。尽管横向肋状通道的螺距内的平均Nusselt数低于完全连接和分离的肋状通道的平均Nusselt数，但这种半连接的肋也可以完全消除LHTA。

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