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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer in a swinging rectangular duct with two opposite walls roughened by 45? staggered ribs
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Heat transfer in a swinging rectangular duct with two opposite walls roughened by 45? staggered ribs

机译：摆动的矩形管道中的热传递，两个相对的壁面被粗糙化了45°？交错的肋骨

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摘要

This paper describes an experimental study of heat transfer in a rectangular channel with two opposite walls roughened by 45? staggered ribs swinging about two orthogonal axes under single and compound modes of pitching and rolling oscillations. A selection of heat transfer measurements illustrates the manner by which the swinging oscillations with and without buoyancy interaction modify local heat transfer along the centerline of rib-roughened surface in the range of 0.75-2.25 times of the static channel value. The compound rolling and pitching forces with harmonic and non-harmonic rhythms interacting with buoyancy exhibit synergistic effect to reduce heat transfer. An adverse buoyancy effect that reverses the buoyancy interaction from improving to impeding heat transfer when the relative strength of swinging force increases could develop in the channel that swings with compound mode oscillation. An empirical heat transfer correlation, which is physically consistent, has been developed that permits the individual and interactive effects of single and compound modes of swinging forces with and without buoyancy interaction on forced convection to be evaluated and quantified. This work has been motivated by the need to understand the general effect of swinging oscillation on the performance of the cooling passage in a rib-roughened plate-type heat exchanger under sea-going conditions.
机译：本文描述了在一个矩形通道中传热的实验研究，该通道的两个相对壁均被粗糙化了45?。在俯仰和滚动振荡的单一和复合模式下，交错的肋骨绕两个正交轴摆动。传热测量值的选择说明了在有和没有浮力相互作用的情况下，摆动振荡沿肋粗化表面的中心线在静态通道值的0.75-2.25倍的范围内修改局部传热的方式。具有谐波和非谐波节奏的复合滚动和俯仰力与浮力相互作用，表现出协同效应，以减少热传递。当摆动力的相对强度增加时，可能会在复合模式摆动的通道中产生不利的浮力效果，该不利的浮力效果会将浮力相互作用从改善转变为阻碍传热。已经开发了一种物理上一致的经验传热相关性，可以评估和定量分析在有对流和无浮力作用下，对流的单一和复合形式的摆动力的个体和交互作用。这项工作的动机是需要了解在海上航行条件下，摆动振荡对肋板式板式热交换器中冷却通道性能的一般影响。

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