Abstract
In the paper the results are presented of the study on heat transfer, hydraulic resistance and heat transfer crisis for two-phase water-vapour and air-water flows in circular tubes, 5–34 mm i.d., the relative length being within 45–100 diameters. The tests were carried out within the following range of parameters specific heat flux q = 3.10 5–3.10 6 kcal/ m 2 h; pressure in a test section P = 1–36 atm; mass velocity wy = 180–5400 kg/ m 2 h; steam quality x = 0.05–0.999. The study has two aspects: 1. 1. The heat-transfer mechanism and resistance in a two-phase flow have been studied. (Distribution of liquid and gas phases over the tube cross-section; mass transfer between the wall film and the liquid suspended in the flow core; measurement of liquid film thickness and the process of wave formation at the film surface.) 2. 2. Heat transfer and hydraulic resistance have been studied to obtain particular engineering recomen dations.
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