Effect of lubricating oil contamination on evaporation in refrigerants R12 and R22. H. Cawte, D.A. Sanders and G.A. Poland. Internat. J. Energy Res., August 1996, 20(8), 663--679.
An investigation is reported into the effect of oil concentration on evaporation heat transfer coefficients in refrigerant-oil mixtures flowing in a horizontal tube. A new correlation is presented for heat transfer coefficients in convective evaporation of refrigerant-oil mixtures that predicts the results of the present study within about +/-20%. 26 refs.