Boiling Characteristics of Refrigerant Mixture Flow in Micro Scale Heat Exchangers Enhanced With Micro-Coils

Flow in three horizontal channels for subcooled and saturated boiling characteristics are reported in this study. An experimental setup composed of heating elements provided heat flux variations on the channels. The heat transfer coefficient was found to be dependent on both the heat flux as well as mass flux levels. Results show that micro-coil inserts enhanced the heat transfer performance over that in smooth channels by 25% as compared to correlations for wire-coil inserts and 30% as compared to correlation for convective boiling process.