A simulation for predicting the refrigerant flow characteristics including metastable region in adiabatic capillary tubes .

Focuses on the assumptions that no metastable flow phenomenon and flow in two-phase region is homogeneous have been used exclusively to study the flow characteristics in capillary tubes used as an expansion and controlling device in refrigerating systems. Experimental results indicating that due to the delay of vapourization, the onset of vapourization may not take place at the end of the sub-cooled liquid region; Why two-phase flow in small diameter tubes may be also not entirely homogeneous; How a mathematical model based on conservations of mass, energy and momentum is presented to simulate the refrigerant flow in adiabatic capillary tubes; How the model is validated by comparing with the experimental data reported in literature; What the agreement between experimental and simulation results indicates.