Dynamics of Two-Phase Flows

ISBN Print: 0-8493-9925-4

DISTURBANCE WAVE IN BOILING FLOW

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DOI: 10.1615/0-8493-9925-4.90
pages 185-211

S. Nakanishi Dept. of Chemical Engineering, Himeji Institute of Technology, 2167, Shosha, Himeji, Japan

S. Yamauchi Dept. of Mechanical Engineering, Takamatsu National College of Technology, 355, Chokushi-cho, Takamatsu, Japan

T. Sawai Dept. of Mechanical Engineering, Takamatsu National College of Technology, 355, Chokushi-cho, Takamatsu, Japan

Abstract

A disturbance wave in boiling flow was experimentally investigated through film thickness measurements in a steam-water system as well as flow visualization in a Freon-113 system. Comparing the results with the corresponding adiabatic flow data, we established a new kind of hydrodynamic non-equilibrium, and identified it with that in liquid distribution between the base film and the bodies of the disturbance wave. The decaying process of this non-equilibrium was examined in detail in a non-heated section. Interaction of the disturbance wave with the dryout phenomenon was then clearly demonstrated. Finally, the effects of artificial hydrodynamic non-equilibrium associated with the disturbance wave were discussed.

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