Transient Behavior of a Gas Slug : 1st Report, On an ascending gas slug with rapid growth

概要

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The transient behavior of a gas slug with rapid growth, which is encountered in evaporators operated under the atmospheric pressure, was investigated using a simulated flow system of air-water. The growth of a gas slug is considered to be brought about in two stages: the first is caused by an instantaneously enhanced pressure due to violent evaporation in a highly superheated liquid, and the second by a rapid decrease in static head as the gas slug ascends the vertical tube connected to the water-separator kept at a vacuum. The simulation of the first stage of expansion was made by introducing a gas slug, having a greater pressure than that of the water near the gas slug, into the test tube. It was observed that the gas slug flows upwards generating a damped oscillation: i.e., the tail end of the gas slug ascends linearly, but the top fluctuates remarkably. An analysis proposed of this transient flow can predict the complex motions of the gas slug with sufficient accuracy.
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