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首页> 外文期刊>International Journal of Heat and Mass Transfer >Two-phase flow pattern in small diameter tubes with the presence of horizontal return bend
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Two-phase flow pattern in small diameter tubes with the presence of horizontal return bend

机译：小直径管中存在水平回弯的两相流型

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摘要

This study provides a qualitatively visual observation of the two-phase flow patterns for air-water mixtures inside 6.9, 4.95, and 3 mm smooth diameter tubes with the presence of horizontal return bend. The influence of the return bend on the two-phase flow patterns are investigated. For D = 6.9 mm and at a mass flux of 50 kg m~(-2) s~(-1) having a quality less than 0.1, no influence on the flow patterns is seen at a larger curvature ratio of 7.1. However, were the curvature ratio reduced to 3, the flow pattern in the recovery region is temporarily turned from stratified flow into annular flow. The temporary flow pattern transition phenomenon from stratified flow to annular flow is not so pronounced with the decrease of tube diameter. It is likely that this phenomenon is related to the influence of surface tension and the reduction of developing length of the swirl flow. Based on the present flow visualization, three flow pattern maps are proposed to describe the effect of return bend on the transition of two-phase flow pattern.
机译：这项研究从质量上直观地观察了直径为6.9、4.95和3 mm的光滑直径试管内空气-水混合物的两相流模式，并存在水平回弯。研究了折弯对两相流型态的影响。当D = 6.9 mm且质量通量为50 kg m〜（-2）s〜（-1）时，曲率比为7.1时，对流型没有影响。但是，如果曲率比减小到3，则恢复区域中的流型会暂时从分层流变为环形流。随着管径的减小，从分层流到环形流的临时流型过渡现象不是很明显。这种现象很可能与表面张力的影响和旋流的展开长度的减少有关。基于目前的流动可视化，提出了三个流动模式图，以描述折弯对两相流动模式过渡的影响。

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