Melnyk А. The flow boiling of the isobutane/compressor oil solutions (Experiment, correlation)

In order to complex investigation of the influence of oil impurities on the heat transfer coeffi-cient for the flow boiling of real working fluids in tube an experimental setup has been designed. In the process of the executed researches it was revealed that at mass velocity of working fluid from 11.90 to 21 kg/(m2s) and heat flux from 2500 to 3200 W/m2, typical for the domestic refrigeration ap-pliances, the stratified or wavy stratified flow pattern was implemented.Analysis of the obtained experimental data allowed to conclude that impact of the compressor oil admixtures on the processes of the ROS boiling in the evaporator has multiple-factor nature. Heat transfer coefficient at the RWF boiling depends on the concentration of oil in the refrigerant, heat flux, foaming process, flow rate and flow regime of the working fluid in the evaporator.