Stratification and heat transfer characteristics of partially miscible lubricating oil-refrigerant mixtures during pool boiling

Applying partially miscible lubricating oil-refrigerant mixtures instead of completely ones in refrigeration systems is a promising way to avoid the refrigerant insufficiency, and application oil requires clarity nucleate pool boiling characteristics mixtures. As at conditions show an entirely different stratification process compared or non-boiling studied by former researchers, existing researches cannot be directly applied evaluate mixture. The purpose this study experimentally investigate model both heat transfer performance phenomenon observed, up four layers (i.e., oil-rich micro-layer, middle oil-poor layer, top gas phase layer) are found. stratifying from single layer into modelled, calculation methods mass rates among proposed. validation shows that predicted thicknesses accord with experimental images, which covers flux ranging 5 15 kW/m2, initial fraction 15%, height 80 120 mm. Predicted coefficients agree 80% data within deviation ± 25%, mean 15.3%.