THE MELTING OF AN ICE SHELL ON A HEATED HORIZONTAL CYLINDER

This paper describes the fundamentals of melting when a shell of phase -change material rides on a heated horizontal cylinder. In the first p art of the paper, contact melting theory is used to predict the histor y of the melting process and, in particular, the time when the remaini ng ice falls off the cylinder. It is shown that the melting process co nsists of two distinct regimes, first, an early regime when the cylind er is surrounded by ice and, second, a late regime when the cylinder c uts through the top of the ice shell. The second part describes labora tory measurements that validate the theory. The third part of the pape r shows that in the complete cycle that starts with freezing the shell and ends with the contact-melting removal of the shell, there exists an optimal frozen shell thickness such that the cycle-averaged product ion of ice is maximized.