液相流動モデルによる気液二相摩擦圧力損失の予測

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  • Prediction of Two-Phase Frictional Pressure Loss by Hydrodynamic Flow Model.
  • エキソウ リュウドウ モデル ニ ヨル キエキ 2ソウ マサツ アツリョク ソンシツ ノ ヨソク

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Simultaneous measurements of pressure gradients and spatio-temporal characteristics of gasliquid interface are conducted in vertical upward two-phase flow. To clarify the mechanism of frictional pressure losses for slug, churn and annular flow regimes, a hydrodynamic flow model is presented which permits predictions of the frictional pressure gradient for a wide range of flow regimes. The liquid flow structure is assumed to consist of waves propagating upward and base film flow. The contributions of waves and base film flow to the frictional pressure gradients are presented by considering P. D. F. for liquid holdup. At low liquid flow rate, the wave velocity is much higher than the absolute velocity of the base film, and the frictional pressure gradient is dominantly caused by the wave propagation. At high liquid flow rate, the contribution of the base film flow becomes comparable to that of waves. The agreement between the predicted frictional pressure gradients by the present model and experimental data is fairly good.

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