仕切りのある開口部におけるヘリウム-空気流

概要

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The helium-air exchange flow through a small vertical opening with a partition was experimentally investigated. The vertical partition was aligned with the center line of the small opening to evaluate the effects of the multiple openings. The dimensionless exchange flow rates, i.e., Froude numbers, were experimentally obtained with several opening ratios (H_1/D_f), i.e., the ratio of the height to the effective diameter of the opening. In the case of low opening ratios (H_1/D_f<0.75), the measured Froude number for the multiple openings were almost the same as that for the single opening. The Froude numbers could be predicted with Epstein's modeling for a single opening. In the case of high opening ratios (H_1/D_f ≥0.75), the measured Froude numbers for the multiple openings were larger than those for the single opening, because the upward and downward flows were separated by the vertical partition. Based on the balance between the pressure losses in the openings and the driving force due to density difference, the exchange flow rate was calculated, and found to agree qualitatively with the measured Froude numbers. The effect of the upward and downward flow interaction at the exit of the opening was found to play an important role in the prediction of the Froude number.
一般社団法人日本機械学会の論文
1993-10-25