In this paper, an experimental study on two-phase flow patterns (evaporation) for propane in a horizontal smooth tube is presented. The tests were conducted at various saturation pressures from 0.2 MPa to 0.4 MPa for different mass velocities from 70 kg/(m²s) to 180 kg/(m²s) and two heat fluxes (20.16 kW/m² and 37.1 kW/m²) in the entire ranges of vapour qualities. Several flow pattern maps were compared with the experimental flow pattern data, especially for the intermittent/annular (I/A) transition line. Finally, a transition equation of intermittent/annular flow for propane was modified with an improved flow pattern map. 

Physics Procedia, 2015