粒子追跡法に基づく分散性混相流の数値解析　第１報　数値解法と鉛直管内層流気泡流への適用

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タイトル別名
  • Numerical Simulation of Dispersed Multiphase Flow Based on a Particle Tracking Method. 1st Report. Numerical Method and Application to Laminar Bubbly Upflow in a Duct.
  • リュウシ ツイセキホウ ニ モトズク ブンサンセイ コンソウリュウ ノ スウチ

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A numerical method for simulating a three-dimensional dispersed multiphase flow was proposed in the present study. The method is based on a two-way particle tracking method, which takes into account the effect of the dispersed phase on the continuous phase and vice versa. The field equations of the method are compatible with those of conventional multi-fluid models. In order to demonstrate the potential of the method, laminar bubbly upflow in a vertical square duct was simulated by taking the Eotvos number and a bubble size distribution as parameters. As a result, we obtained typical bubble distributions, i. e., wall-peak, core-peak and intermediate distributions. A void wave in the flow direction was also observed in the calculated core-peak distribution, which indicates that the method has the potential for predicting flow pattern transition from bubbly flow to slug flow.

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