抄録
Flow regime transition and pressure drop in gas-liquid countercurrent two-phase flow was studied in three vertical parallel channels. The conditions for flooding initiation in parallel-channel systems could be predicted well using Imura's correlation for a single channel. After flooding, the flow patterns were different in each channel. Aflow pattern classification diagram for the three-channel system was developed based on the flow patterns observed under various conditions of gas and liquid flow rates. It was seen from the results of pressure measurement in the three-channel system that the maximum pressure developed in each channel had a serious effect on the average pressure in the lower plenum, and that the frictional loss coefficient, estimated from the time-averaged pressure in the lower plenum, could be correlated to the relative gas Reynolds number.
