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The mechanism for the formation of slug flow in vertical gas-liquid two-phase flow

机译：垂直气液两相流中弹状流形成机理

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This paper studies the mechanism for the formation of a slug flow in vertical gas-liquid two-phase flow. By analyzing void fraction waves and their instability, it is proved that the formation of a slug flow regime is due to the increase of void fraction waves, which causes the conglomeration of gas bubbles and the coalescence of bubble clusters in unstable bubbly flow. Experiments and analysis show that intense turbulence can restrain the formation of Taylor bubbles. Therefore, in a large diameter vertical pipe, a Taylor bubble can form under a condition of low continuous volume flux due to the action of void fraction waves. However, the coalescence effect of void fraction waves as it affects bubbles is suppressed in high continuous volume flux, and therefore, a slug flow regime cannot be observed in the evolution of flow patterns. Under a condition of high continuous volume flux (F_L = 0.15 m/s) described in the paper, the flow pattern evolution is from cap bubbly flow to cap churn flow, and then gradually to churn flow with the increase of void fraction.
机译：本文研究了垂直气液两相流中团状流形成的机理。通过分析孔隙分数波及其不稳定性，证明了团状流态的形成是由于孔隙分数波的增加所致，这导致了气泡的聚集和气泡团在不稳定气泡流中的聚结。实验和分析表明，强烈的湍流可以抑制泰勒气泡的形成。因此，在大直径立管中，由于空隙率波的作用，在连续体积通量小的条件下会形成泰勒气泡。但是，在高连续体积通量中，空隙率波影响气泡的聚结作用被抑制，因此，在流型的演变中不能观察到团状流态。在本文描述的高连续体积通量（F_L = 0.15 m / s）的条件下，流态的演变是从帽状气泡流到帽状搅动流，然后随着空隙率的增加而逐渐变为搅动流。

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