Theoretical Investigation on Heat Transfer by Nucleate Boiling

Abstract

As previously reported, we found that the Nusselt number at the stage of nucleated boiling is proportional to N^1/3, where n is the number of nuclei of steam bubbles generated on horizontal heating surface. In this paper we derive this relation theoretically assuming that the main driving forceof convection is the change of apparent density by rising bubbles. Further we discuss the nature of n, especially in connection with the contamination on the heating surface.