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Model development of turbulent dispersion force for advanced two-fluid model in consideration of bubble-liquid phase interactions

拡張二流体モデルに適合した乱流拡散項のモデル化

細井 秀章*; 吉田 啓之 

Hosoi, Hideaki*; Yoshida, Hiroyuki

At the advanced two-fluid model, an interface tracking method is combined with the two-fluid model to predict large interface structure behavior without any constitutive equations which depend on shapes of flow channels. However, constitutive equations to evaluate the effects of small bubbles or droplets on two-phase flow are required. In this study, we develop the new model for turbulent dispersion force term. In this model, effect of large bubbles and deformation of bubbles are neglected to fit the advanced two-fluid model. And the liquid phase turbulent kinetic energy and bubble-induced turbulent kinetic energy are considered as a driving force of dispersion of small bubbles. To verify the present model, the advanced two-fluid model and the model for turbulent dispersion term were incorporated to ACE-3D. And results of numerical simulation were compared with experimental results of air-water two-phase flow in 200 mm diameter vertical pipe.

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