Numerical Analysis of Water Flow Boiling Characteristics within Vertical Rectangular Thin Channels

Abstract

In this paper, water flow boiling characteristics within vertical rectangular thin channels were numerical analyzed. By the method of numerical simulation, the isolation bubbly stream flow patterns adapt to the non-restricted and restricted thin channel were obtained and the influence of channel-scale on the boiling flow pattern characteristics are analyzed. Study shown that the system pressure drop is increased with the decrease of the channel width; the heat transfer coefficient shows a decreasing trend after the first increase along with the increasing dryness; the decline of channel scale will lead to increasing of the average heat transfer coefficient.