Abstract
Characteristics of flow patterns and frictional pressure drop and the flow phenomena of gas-liquid two-phase flow in microchannels were investigated experimentally by using three kinds of circular microchannels with the inner diameter of 0.10 mm, 0.15mm and 0.25mm. The effect of tube diameter on the flow patterns was made clear by using high speed video images. In the flow patterns maps the boundaries of the transition from slug flow to ring film flow or churn flow in each channel shifted to the side of smaller values of the superficial gas velocity when the tube diameter decrease. It was found that there were not so remarkable difference between the frictional pressure drops in each microchannel due to the sizes of tube diameters.
