Non-dimensional Correlation for Boiling Heat Transfer from Sintered Porous Layer Surface

Abstract

This chapter discusses the non-dimensional correlation for boiling heat transfer from sintered porous layer surface. There are two methods to increase boiling heat transfer–enlarge the heat transfer area, and enhance the boiling heat transfer coefficient. It's effective to improve nucleate boiling heat transfer coefficient by means of porous layer surfaces. Boiling heat transfer coefficient can be raised up to approximately 10 times as large as that of a smooth surface. However, boiling heat transfer is a liquid-gas two phase process, whose heat transfer and mass transfer are extremely complex, then, there is two-phase flow of capillary in the porous layers, which make the boiling heat transfer mechanism even more complicate. Currently main research methods can be classified into two groups–setting up a mechanism model on the basis of porous surface structures combined with experimental investigation, and finding out the dimensionless criteria that affect the heat transfer based on experiment and propose dimensionless heat transfer correlation. This chapter summarizes dimensionless criteria correlation applicable to boiling heat transfer on porous layer surfaces on the basis of a series of experiments.