Abstract
An optical measurement system was used to investigate the effect of microchannel length on adiabatic gas-liquid two-phase flow characteristics. Experiments were conducted with 1,676 mm long, circular microchannel with the diameter of 100 μm. Two-phase flow patterns, void fraction and velocities of gas and liquid slugs were measured at any location from gas-liquid mixer to channel exit. The experimental values of the mean void fraction and the mean velocity of liquid slug agreed well with their values given by the equation of the homogeneous flow model from gas-liquid mixer up to channel exit when the flow rate of the liquid was constant and the mass velocity of the gas was lower. The transition of the flow patterns from slug flow to ring film flow was observed when the flow rate of the liquid was constant and the mass velocity of the gas became large.
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