Spatio-Temporal Structure of Gas-Liquid Interface at Flooding for Two Inlet Devices of Gas Flow

概要

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To investigate the effect of the entry configuration of gas flow on the mechanism of flooding and to propose the prediction model of flooding, experiments of counter-current air-water two-phase flow are conducted. Two different types of inlet devices are used in the present study: "Bottom Entry" and "Nozzle Entry". The effect of liquid viscosity on flooding is also investigated by using three kinds of temperatures of fluids 17°C, 30°C, and 47°C. Simultaneous measurements of the pressure drop and the spatio-temporal gas-liquid interfacial structure are conducted to detect the change in flow characteristics at the onset of flooding. The results obtained are as follows. The mechanism of flooding greatly depends on the entry configuration of gas flow. In the "Bottom Entry" device, large liquid lump formed near the liquid outlet are closely related to the onset of flooding. At flooding, the pressure gradient jumps up and a sudden and sufficient increase in the liquid holdup is observed. In the "Nozzle Entry" device, there are no appreciable changes in the pressure gradient and the gas-liquid interfacial stucture. The flow model to predict the onset of flooding is presented by considering the steady state momentum equations and the liquid lump formation at the bottom of the tube. It is found that the model can predict the flooding gas velocity for both inlet devices.
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