抄録
An experimental study on the nucleate boiling heat transfer characteristics on surfaces, each with isolated fine cavities was conducted and the results are then be compared with those for reentrant cavities. With the effects of shape and depth of isolated cavities and surface roughness on the non-wettability of the surface and the arrangement of the cavities on the nucleate boiling heat transfer characteristics, the following conclusions were obtained.
(1) A surface with isolated cavities enhances the nucleate boiling heat transfer when it has an increasing in depth of cavities. This type of surface has an effectiveness as a surface having reentrant cavities.
(2) Regarding the distribution density of isolated cavities, the presence of at least one pot-shaped cavity within the area of a single detaching bubble cleary enhances nucleate boiling.
(3) The effect of non-wettability on the enhancement of nucleate boiling heat transfer is significant, independent of the characteristics of the surface cavities.
