The pressure drop characteristic of two-phase flow in normal T-junction has been fully investigated. However

few articles focus on the pressure drop characteristics of the reduced T-junction with flat tube. In this paper

R134a were used as the work medium

and the experimental study on the pressure drop characteristics was carried out at the T-junction placed horizontally. Experimental results show that the existing pressure drop empirical correlations of microchannel were not able to predict the two-phase flow in microchannel flat tube frictional pressure drop accurately. Through fitting experimental data

the empirical correlation of frictional pressure drop for stratified flow with quality range of 0.01-0.45 and flow range of 0.7-3 g/s in microchannel flat tube is obtained

and the gas-liquid interaction coefficient C in Chisholm model was modified to predict the irreversible pressure drop of stratified flow with flow range of 1.1-5.3 g/s

quality range of 0.03-0.26 and separation ratio is 0.1-0.8 from header to flat tube.