千鳥配列円管群における直交気液二相流の数値解析

概要

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The air-water two-phase flows across a tube bundle of staggered arrangement at a pitch-to-diameter ratio of 1.4 are analyzed by an incompressible two-fluid model using the upstream finite element method proposed in our previous study. The Reynolds number, based on the tube diameter and the volumetric velocity of the liquid-phase at the tube gap, is 41 000, and the volumetric fraction of the gas-phase upstream of the bundle ago ranges from 0 to 0.15. The calculated flows exhibit the unsteady and complicated behavior irrespective of α_<g0>. The change in the drag coefficient of a tube in the bundle due to ago and the distribution of the volumetric fraction of the gas phase around the tube are in good agreement with the trend of the measurement, showing the present method's applicability to the two-phase flow analysis in tube bundles. It is also clarified that the unsteady flows are attributable to the occurrence and advection of the vortices of both phases in the bundle.
一般社団法人日本機械学会の論文
1999-08-25