Study on the Influence of Inlet Effect on Pressure and Gas Void Fraction Distribution in Pipe
In this paper,a visual experiment was carried out on the air-water two-phase flow in a vertical pipe with a diameter of 80 mm and a height of 11 m.The experimental condition was selected as the gas superficial velocity of 0.03＜JG＜16.53 m·s-1 and liquid superficial velocity of 0.04＜JG＜2.00 m·s-1.Based on the data obtained by pressure and differential pressure sensors,the influence of inlet effect on two-phase flow was analyzed.In the bubble flow region,the downward trend of pressure is slow with the increase of gas velocity,and the downward trend is faster in the slug flow.When the flow turns into churn flow,the downward trend of pressure slows down again.With the increase of liquid velocity,the gas velocity corresponding to the trend of pressure drop from slow to sharp at each position increases gradually.When the gas velocity is greater than 10 m·s-1,the gas void fraction near the entrance suddenly increases.With the increase of liquid velocity,the gas velocity corresponding to the gas void fraction surging phenomenon at the entrance decreases gradually.
inlet effectgas void fractionpressure distribution
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