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首页> 外文期刊>Journal of enhanced heat transfer >Thermal and Friction Characteristics of Laminar Flow through Square and Rectangular Ducts with Transverse Ribs and Twisted Tapes with and without Oblique Teeth
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Thermal and Friction Characteristics of Laminar Flow through Square and Rectangular Ducts with Transverse Ribs and Twisted Tapes with and without Oblique Teeth

机译:带有和不带有斜齿的带有横肋和扭带的方形和矩形管道的层流的热和摩擦特性

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摘要

Thermal and friction characteristics of a laminar flow through square and rectangular ducts with periodic transverse ribs and different types of twisted tapes with and without oblique teeth have been studied experimentally. Correlations for predicting the friction factor and Nusselt number have been developed and performance has been evaluated. Although both friction factor and Nusselt number are the highest for the case of all types of twisted tapes with oblique teeth in combination with transverse ribs, the performance evaluation has shown that the ducts with transverse ribs and regularly spaced twisted-tape elements with oblique teeth are the best and this is recommended. However, where the pressure drop in a heat exchanger is a small fraction of the total system pressure drop; the heat transfer being higher, full-length and short-length twisted tapes in combination with transverse ribs can be recommended since the heat exchanging surface area requirement will be less.
机译:实验研究了层流通过方形和矩形管道的层流的热和摩擦特性,该管道具有周期性的横向肋和带有或不带有斜齿的不同类型的扭曲带。已经开发出用于预测摩擦系数和努塞尔数的相关性,并且已经评估了性能。尽管在所有类型的带有斜肋的齿形扭曲带结合横向肋条的情况下,摩擦系数和努塞尔数均最高,但性能评估表明,带有横向肋条和规则间隔的带有斜齿的扭曲带元件的导管是最好,这是推荐的。但是,在热交换器中的压降仅占系统总压降的一小部分的情况下;如果热传递较高,则建议使用全长和短长度的扭曲带,并结合横向肋,因为对热交换的表面积要求较低。

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