三流体モデルに基づく環状噴霧流の予測手法に関する研究 （第二報 抗力とせん断応力の構成方程式に関する検討）

Abstract

Interfacial shear stress and liquid film thickness are important for the estimation of deposition and entrainment rates which are used in three-fluid model. An analytical model was developed to estimate the interfacial shear stress and liquid film thickness in the annular-mist flow. This model was used to verify the applicability of the present correlations of the interfacial and wall friction factors and drag coefficient which are used to estimate the water film thickness in annular mist flow. As the results, for the annular-mist flow in very high superficial gas velocity condition, the analytical results of the interfacial friction factor reasonably agreed with the Wallis' correlation for the interfacial friction factor which was developed purely based on the experimental data. And the calculated results of wall friction factor agreed with the equation for the laminar flow. This reason is supposed that the liquid film thickness is very thin less than transition region in the annular-mist flow under high superficial gas velocity. Furthermore, it was indicated that Kataoka's correlation for droplet diameter is applicable for the prediction of drag force.