Gas-liquid two-phase flow regimes and transformation mechanism in horizontal tube under fluctuating vibration
The accurate determination of gas-liquid two-phase flow patterns under fluctuating vibration is of great significance for the design of floating nuclear power plants.Experimental research was conducted on the characteristics of gas-liquid two-phase flow pattern in horizontal tube under fluctuating vibration.New flow patterns were defined and the distribution law of gas-liquid phase was obtained.The influence of pipe diameter,vibration frequency and amplitude on the transition boundary of the flow patterns was revealed.Finally,the transition relationships between bubbly flow and intermittent flow as well as that between intermittent or stratified flow and annular flow were established.The results show that there are four flow regimes,namely bubble flow,intermittent flow,stratified flow and annular flow.It is interesting that the intermittent flow has two types,which are bubble slug intermittent flow and slug plug intermittent flow.Besides,the distribution of gas-liquid two-phase shows a regular change with the change of vibration position.With the same gas superficial velocity,the boundary between bubble flow and intermittent flow moves upwards with the increase of pipe diameter,vibration frequency and amplitude,meanwhile the boundary between intermittent flow and stratified flow move downwards.Under the condition that the liquid phase conversion velocity is constant,increases in pipe diameter,vibration frequency,and amplitude will cause the intermittent flow/stratified flow-annular flow boundary to move to the right.Taking into account the influence of vibration,the transition boundary of intermittent flow to bubbly flow and annular flow were established suitable for low frequency and high amplitude fluctuating vibration.The mean absolute relative errors of prediction and experimental results are 7.62%and 12.68%,respectively.
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