An investigation into flow boiling heat transfer and pressure drop in a pin-finned heat sink

The water data are compared with R113 data obtained in a previous study. The R113 data are shown to be associated with slug and annular flow, and are, in the main, not confined, with its capillary length similar to the channel flow dimensions. The R113 flow pattern transition criteria are comparable to macro-scale values. Some consistency in behaviour is shown to exist in the slug heat-transfer coefficients obtained with water and R113.