Title: Two-Phase Flow Study Using 300mm Diameter Pipe
Abstract:Two Phase flow experiment was conducted using a 300mm diameter, 100m long straight pipe with adjustable gradient. A cast-iron with, in part, transparent plasticpipe was used. Superficial water and air...Two Phase flow experiment was conducted using a 300mm diameter, 100m long straight pipe with adjustable gradient. A cast-iron with, in part, transparent plasticpipe was used. Superficial water and air velocities were somewhat low, ranging from 0 to 3m/s and 0 to 20m/s. The data show scattering by intermittent flow to beunstable. Test results are as follows1. Observed flow pattern in the horizontal pipe shows that the boundary betweenintermittent flow and separate flow is almost the same as that of lately publishedresults. But flow pattern is much more sensitive to pipe gradient, with a degree of 1/1000. Down gradient flow shows a wide separated pattern and the up gradient flowshows intermittent flow throughout almost all the area.2. The void ratio is also sensitive to pipe gradient. In horizontal and up gradient flow, voidratio seems to show similar value to when the ratio of superficial air velocity to superficialwater velocity is equivalent.3. Empirical formula of the pressure loss at various superficial water and air velocitieswas obtained.4. Empirical formula of the effect of the pipe gradient on the pressure loss wasachieved. Tests will be carried out successively to gain further information.Read More