ねじりテープ挿入管内の空気-水垂直上昇二相流の流動様式

概要

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Experiments were performed to investigate the flow patterns which occur in upward air-water two-phase flow in vertical twisted-tape-inserted and circular empty tubes. Three basic flow patterns, i. e., bubbly, intermittent and annular flow, were defined based on the observations in the present experiments. At high water flow rate and small twist ratio, the bubbly-intermittent transition occurred at a lower air flow rate in the twisted-tape-inserted tubes than in the empty tube due to the centrifugal force of swirl flow which concentrated bubbles at the center of tube. The effect of centrifugal force was successfully modeled to obtain the criterion equation of the bubbly-intermittent transition. The intermittent-annular transition could be predicted well by the existing criterion equation developed for empty tube.
社団法人日本機械学会の論文
1996-02-25