Stability of a Liquid Film in a Counter-Current Annular Two-Phase Flow : Mainly on a Critical Heat Flux in a Two-Phase Thermosyphon

概要

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It has been reported that, in the counter-current annular two-phase flow where a liquid film flows down along the wall of vertical tube and gas flows up in the core, instability of liquid film results not from reversal of flow of liquid under surface shear but from instability of the wave occurring on the surface of liquid film. From this viewpoint, the instability of the wave was treated and a correlation of critical velocity at which the liquid film becomes unstable was derived. Critical heat fluxes of the two-phase thermosyphon for pure water, ethyl-alcohol, nhexane and carbon-tetrachloride as the working fluids were correlated and comparatively good agreement was obtained. In addition, the correlation derived was compared with the previous experimental expression of a flooding velocity in a wetted column and some discussions were made.
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