Cross flow boiling in tube bundles

The objective of the research described in this thesis is to understand the boiling heat transfer characteristics in the tube bundles. The studies are performed both analytically and experimentally. Analyses are conducted for single phase flow in bundles with various geometries. The results are compared with the available experimental data. Recommendation for simple and general design correlations at special conditions are proposed. Experimental results of forced convective boiling of a horizontal tube in a channel as well as in a bundle are reported. The difference between a single tube in a channel and a tube in a bundle is attributed to the different flow field environment and thermal environment. A modified Chen's correlation can be used to predict the heat transfer performance of a single tube in a channel or in a bundle. An empirical Critical heat flux (CHF) correlation of forced convective boiling from a single tube in a channel is proposed. The agreement of this correlation with the experimental data is reasonable with the maximum deviation of 20%.