Abstract
Experiments on the flow boiling of refrigerants inside a horizontal, spirally grooved steel tube with the 12mm average inner diameter were performed using a fluorocarbon refrigerant HCFC123. Experimental conditions were 50 to 150kg/(m^2s) in mass velocity, 0.2MPa in pressure, and nearly 0 to 5kW/m^2 in heat flux. The method to decide the flow pattern based on the condition of the liquid film on the tube surface was described using the circumstantial distribution of the wall temperatures, and the flow pattern maps were presented in the form of mass velocity versus vapor quality.
