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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Influence of horizontal return bend on the two-phase flow pattern in small diameter tubes
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Influence of horizontal return bend on the two-phase flow pattern in small diameter tubes

机译：水平折弯对小直径管内两相流型的影响

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摘要

The influences of return bend on the two-phase flow patterns for air-water mixtures inside 6.9 and 3 nun smooth tubes are investigated in this study. For D = 6.9 mm and at a mass flux of 50 kg/m(2) s having a quality less than 0.1, no influence on the flow patterns is seen at a larger curvature ratio of 7.1. However, as the curvature ratio is reduced to 3, the flow pattern in the recovery region is temporarily turned from stratified flow into annular flow. But this phenomenon is suppressed again when the quality is increased to 0.3. The temporarily flow pattern transition phenomenon from stratified flow to annular flow is again suppressed when the tube diameter is reduced to 3 mm. It is likely that this phenomenon is related to the influence of surface tension and the reduction of developing length. Based on the present flow visualization, two flow pattern maps are proposed to describe the effect of return bend of the transition of two-phase flow pattern for 3 and 6.9 mm. diameter tubes. An empirical fit of the observed length of the temporary annular flow in the recovery region is proposed that gives good predictions with the present data. (C) 2003 Elsevier Inc. All rights reserved. [References: 15]
机译：本研究研究了6.9和3尼姑光滑管内回水弯曲对空气-水混合物两相流型的影响。对于D = 6.9 mm且质量通量为50 kg / m（2）s且质量小于0.1的情况，在较大的曲率比7.1下看不到对流型的影响。但是，随着曲率比减小至3，恢复区域中的流型暂时从分层流变为环形流。但是当质量增加到0.3时，这种现象再次得到抑制。当管径减小到3 mm时，从分层流到环形流的临时流型过渡现象再次得到抑制。这种现象很可能与表面张力的影响和显影长度的减少有关。基于当前的流动可视化，提出了两个流动模式图来描述两相流动模式在3 mm和6.9 mm处过渡的折返弯曲的影响。直径管。提出了在恢复区域中观察到的临时环形流长度的经验拟合，该拟合对当前数据给出了很好的预测。 （C）2003 Elsevier Inc.保留所有权利。 [参考：15]

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