Boiling heat transfer on surfaces coated by porous wick with vapor channels

A one-dimensional mathematical model for boiling heat transfer in a porous wick with open vapor channels was developed in an attempt to obtain structu ral optimization of the channels. The effect of the vapor channels on boili ng heat tranfer was analyzed theoretically. It is shown that the vapor chan nels in the porous wick can enhance boiling heat transfer and increase the critical heat flux. It is predicted from this model that the dryout conditi ons are affected by the channels size and density. An optimum channel densi ty exists, the value of which depends on the specific properties of the por ous coating.