Pool boiling heat transfer of deionized and degassed water in vertical/horizontal V-shaped geometries

Nucleate pool boiling using a surface within an angular geometry was conducted in saturated, deionized and degassed water. Data were taken at atmospherical pressure and at heat fluxes from 300 W/m(2) to 51000 W/m(2) while decreasing the heat flux. The effects of the angle on the initiation of boiling of nearly contact line are documented, and a model for pool boiling heat transfer in vertical/horizontal V-shaped geometries was correlated in the form of equation (4). It was also found that the angular geometry was presented to have a distinct advantage in boiling heat transfer coefficient relative to the flat plate. In addition, the pool boiling heat transfer of the vertical/horizontal V-shaped geometries were shown the same tendency, but, the results on the same conditions also showed that the enhancement ratios of the vertical V-shaped geometries are averagingly higher than those of the horizontal V-shaped geometries. In general, the results reveal the importance of the angular geometry to the enhanced nucleate boiling heat transfer of structured surface, and it is also attributed to information for the development of more effective surfaces.