Study on Homogeneous Flow Model for Air-Water Two-Phase Flow in Mini-Rectangular Channel

The applicability of homogenous flow model to vertical mini-rectangular channel is evaluated by using air and de-ion water as the working fluid.The results show that the homogenous flow model with McAdams viscosity and the Chen modified homogeneous flow model could predict the pressure drop for the rectangular channel having the narrow gap of 1.41mm with the Mean Absolute Error（MAE） of 10.92% and 12.20%,respectively.The homogenous flow model with McAdams viscosity fails to predict the pressure drop for the channel having the gap of 3mm,except that the two-phase Reynolds number is greater than 6000 in which the MAE is 10.04%.The scale of homogenous flow model applied for rectangular duct having the narrow gap of 3mm is proposed by analyzing the experimental data.A new correlation is proposed for the channel with the gap of 3mm when the gas and liquid flow rate is low,and shows good agreement with the experimental data.