The Effect of Small Holes on Phase Splitting in Two-phase Flow Division

摘要

Experimental data are presented for the split of air-water two-phase flow at a special designed T-junction type distributor. The inner diameter of inlet and run arms of the distributor is 51mm, and the branch diameter is 25mm.The distributor composes eight small holes with a diameter of 3.5mm on the pipe wall and a ring casing is mounted outside of these holes. The gas-liquid mixture entered these small holes will flow through the side arm of the distributor. The flow pattern observed is annular flow. Results shown these small holes have significant effect on the phase splitting: In the test conditions the fraction of gas taken off is 0.035-0.08;the fraction of liquid taken off is 0.08-0.35. The liquid phase preferentially goes through the side arm. With increasing the inlet gas flow rate will decrease the fraction of gas taken off. On the contrary, an increase of liquid flow rate will lead to an increase of the fraction of gas taken off. The results are compared with data from other authors and the effect of small holes is successfully explained by Azzopardi's theory.