Chinese Journal of Chemical Engineering, Vol.9, No.2, 221-223, 2001
The effect of sudden change in pipe diameter on flow patterns of air-water two-phase flow in vertical pipe (II) sudden-expansion cross-section
In this companion paper, how patterns in the upstream and downstream tubes of a sudden-expansion cross-section (SECS) in a vertical straight pipe were presented. The effect of SECS on flow patterns upstream and downstream was analyzed by comparing with flow patterns in uniform cross-section vertical tubes. It is found the effect is great. There exist great instabilities of two-phase flow in the neighboring areas of the SECS both downstream and upstream.