Theoretical and Experimental Analysis of Heat Transfer and Condensation in Micro-Ribbed Tubes

The thermal transmission coefficient for a micro-ribbed tube has been determined using theoretical relationships and the outcomes of such calculations have compared with experiments conducted R1234yf refrigerant undergoing condensation. In particular four single-phase flow three multi-phase models used in this regard. experimental results show that: Oliver et al. criterion equation overestimates as its accuracy is significantly affected by specific conditions realized inside micro-fin tubes; Miyara prediction error less than 15%; Cavallini approach gives highest accuracy; Goto model test data. Such are critically discussed some indications improvement provided.