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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Vortices, generators and heat transfer
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Vortices, generators and heat transfer

机译：漩涡,发电机和传热

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Longitudinal vortices are more efficient for heat transfer enhancement than transverse vortices. A survey is given on triangular and rectangular protrusions from a heat transfer surface which generate mainly longitudinal vortex systems. Wings and winglets are considered in boundary layer and channel flow, either by themselves, or in a single row transverse to the flow; direction, or in a two dimensional array. Local and global heat transfer are studied as a function of the major parameters. For channel flows also the pressure losses are given. Winglets are superior to wings, but winglet form is of minor importance. In laminar how. heat transfer enhancement increases with Reynolds number. Heat transfer enhancement increases for constant winglet aspect ratio with angle of attack up to a maximum angle of attack. But it increases also up to limiting values with winglet height relative to transverse and streamwise winglet spacing and relative to channel height or boundary layer thickness. The nonlinear character of fluid mechanics does not allow simple predictions. [References: 62]
机译：纵向涡流热更有效转移增强比横向漩涡。调查给出了三角形和矩形从传热表面突起生成主要纵向涡系统。机翼和翼被认为是在边界图层和通道流动,通过自己,或在单个行横向流;方向,或在一个二维数组。和全球传热进行了研究功能的主要参数。流动的压力损失。小翼是优于翅膀,但小翼形式是次要的。转移增强增加而雷诺兹号码。与角恒定小翼宽高比攻击最大攻角。也增加了限制值与小翼高度相对于横向和流向小翼间距和相对高度或频道边界层厚度。流体力学不允许简单预测。

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