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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 >Experimental investigation of non-boiling gas-liquid two phase flow in upward inclined pipes
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Experimental investigation of non-boiling gas-liquid two phase flow in upward inclined pipes

机译：上斜管内非沸腾气液两相流的实验研究

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摘要

In comparison to horizontal and vertical two phase flow, very little information is available on the two phase flow phenomenon in upward inclined pipes. To explore and contribute to the current state of knowledge, the main objective of this work is to experimentally investigate the effect of upward pipe inclinations (horizontal to vertical upward) on gas-liquid two phase flow phenomenon. To accomplish this objective, experiments focused on flow visualization, void fraction, pressure drop and heat transfer measurements in non-boiling gas-liquid two phase flow are carried out in 12.7 mm I.D. polycarbonate and 12.5 mm I.D. stainless steel pipes using air-water as fluid combination. Different flow patterns are generated by varying the gas and liquid phase mass flow rates in a range of 0.001-0.2 kg/min and 1-10 kg/min, respectively. Experimental data for void fraction, pressure drop and heat transfer coefficient is analyzed for its dependency on phase flow rates and pipe inclination. Two distinct trends of the relation between these two phase flow variables and the phase flow rates or alternatively the flow patterns are observed. The experimental results show that increase in pipe inclination from horizontal significantly affects the void fraction, total pressure drop and heat transfer coefficient at low values of gas and liquid flow rates. With increase in the gas and liquid flow rates, effect of pipe inclination on two phase flow variables is observed to diminish. The issue of decreasing pressure gradient minimum in upward pipe inclinations is analyzed using non-dimensional form of gas and liquid flow rates. Finally, based on the heat transfer measurements, the circumferential variation of two phase heat transfer coefficient and its relation to the flow symmetry is discussed. (C) 2016 Elsevier Inc. All rights reserved.
机译：与水平和垂直两相流相比，关于向上倾斜的管道中的两相流现象的信息很少。为了探索和促进当前的知识水平，这项工作的主要目的是通过实验研究管道向上倾斜（水平到垂直向上）对气液两相流动现象的影响。为实现这一目标，在12.7 mm I.D.中进行了以无沸腾气液两相流中流动可视化，空隙率，压降和传热测量为重点的实验。聚碳酸酯和12.5毫米内径使用空气-水作为流体组合的不锈钢管。通过分别在0.001-0.2 kg / min和1-10 kg / min的范围内改变气相和液相质量流速来产生不同的流型。分析了空隙率，压降和传热系数的实验数据，它们与相流速和管道倾斜度有关。观察到这两个相流变量与相流率之间的关系的两个不同趋势，或者可观察到流型。实验结果表明，在气体和液体流速较低的情况下，管道从水平方向倾斜的幅度会显着影响空隙率，总压降和传热系数。随着气体和液体流速的增加，观察到管道倾角对两相流量变量的影响减小。使用气体和液体流速的无量纲形式分析了向上倾斜管道时减小压力梯度最小值的问题。最后，基于传热测量，讨论了两相传热系数的周向变化及其与流动对称性的关系。 （C）2016 Elsevier Inc.保留所有权利。

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