Flow Simulation of Forced-Flow Boiling with Air-Water Two-Phase Fluids : 1st Report, On the Distribution of Bubbles

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An attempt was made to simulate the forced flow boiling in flow characteristics with air-water two-phase fluids, into which air was injected through the porous wall of a round tube. The test section of porous wall is 1450 mm in length and 26 mm in inner diameter. This report treats the spatial (i.e., radial and axial) distributions in both void fraction and bubble frequency for the bubble flow regime under atmospheric pressure and room temperature. The experiments suggest the existence of three regions differentiated in the radial distribution of bubbles. The 1st. one is the bubble sublayer formed adjacent to inner surface. The 2nd. one is bubble transition layer characterized by rather high concentration of bubbles. The 3rd. one is the core outside the bubble transition layer. Results and discussion are presented on the thickness, void fraction and bubble frequency in two bubble layers. Development of these flow parameters along the tube is also discussed.
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