[3G08-10] Gas-liquid Two-phase Flow

[3G09] Evaluation of Void Fraction in Vertical Pipes under Flooding at the Upper End

*Toshiya Takaki¹, Michio Murase¹, Kosuke hayashi², Akio Tomiyama² (1. INSS, 2. Kobe Univ.)

Keywords:Vertical pipe, Countercurrent flow, Flooding at upper end, Void fraction, Drift-flux

Void fraction α and interfacial friction factor f_i under flooding at the top end in vertical pipes were obtained by using the correlation of wall friction factor f_w proposed in our previous study and existing data for pressure gradient dP/dz. A correlation for liquid film thickness δ was derived as a function of the liquid Reynolds number Re_L, a correlation for f_i was derived as a function of the gas Kutateladze parameter K_G^*, and an experimental equation for drift velocity V_gj with the distribution parameter of C₀ = 1.0 was derived.