CHARACTERISTICS OF GAS-LIQUID 2-PHASE FLOW IN A CAPILLARY-TUBE

Gas-liquid two-phase phenomena in capillary tubes were investigated wi th special attention on the flow patterns, the time varying void fract ion and pressure loss. The directions of flow were vertical upward, ho rizontal and vertical downward. Pipe inner diameters used were 1 mm, 2 .4 mm and 4.9 mm. As a result it is made clear that due to the strong effects of surface tension the flow pattern is not severely affected b y the direction of flow, the smaller the pipe inner diameter, the easi er the formation of liquid slug and the pressure loss in a unit length takes much larger than the estimated value by the Chisholm equation.