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首页> 外文期刊>International Journal of Multiphase Flow >An experimental study on developing air-water two-phase flow along a large vertical pipe: effect of air injection method
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An experimental study on developing air-water two-phase flow along a large vertical pipe: effect of air injection method

机译：沿大垂直管发展气水两相流的实验研究：注气法的影响

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摘要

The flow structure in a developing air-water two-phase flow was investigated experimentally along a large vertical pipe (inner diameter, Dh: 0.48 m, ratio of length of flow path L to Dh: about 4.2). Two air injection methods (porous sinter injection and nozzle injection) were adopted to realize an extremely different flow structure in the developing region. The flow rate condition in the test section was as follows: superficial air velocity: 0.02–0.87 m/s (at atmospheric pressure) and superficial water velocity: 0.01–0.2 0.01–0.2 m/s, which covers the range of bubbly to slug flow in a small-scale pipe (Dh about 0.05 m). No air slugs occupying the flow path were recognized in this experiment regardless of the air injection methods even under the condition where slug flow is realized in the small-scale pipe. In the lower half of the test section, the axial distribution of sectional differential pressure and the radial distribution of local void fraction showed peculiar distributions depending on the air injection methods. However, in the upper half of the test section, the effects of the air injection methods are small in respect of the shapes of the differential pressure distribution and the phase distribution. The comparison of sectional void fraction near the top of the test section with Kataoka's correlation indicated that the distribution parameter of the drift-flux model should be modeled including the effect of Dh and the bubble size distribution is affected by the air injection methods. The bubble size distribution is considered to be affected also by L/Dh based on comparison of results with Hills' correlation.
机译：沿着大型垂直管道（内径Dh：0.48 m，流路长度与Dh的长度比：约4.2），对正在发展的气水两相流中的流动结构进行了实验研究。采用两种注气方法（多孔烧结注浆法和喷嘴注浆法）在显影区实现了截然不同的流动结构。测试部分的流速条件如下：表观风速：0.02–0.87 m / s（在大气压下）和表观水速：0.01–0.2 0.01–0.2 m / s，涵盖了气泡到团状的范围在小型管道（Dh约为0.05 m）中流动。即使在小型管中实现了团状流的条件下，在本实验中，无论注入方法如何，都没有发现占据流路的团状空气。在测试部分的下半部分，取决于空气注入方法，截面压差的轴向分布和局部空隙率的径向分布表现出特殊的分布。然而，在测试部分的上半部分，关于压差分布和相分布的形状，空气注入方法的效果很小。测试区域顶部附近的截面空隙率与Kataoka的相关性的比较表明，应该对漂移通量模型的分布参数进行建模，包括Dh的影响，并且气泡尺寸分布会受到注气方法的影响。根据希尔斯相关结果的比较，认为气泡尺寸分布也会受到L / Dh的影响。

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