成分気泡流中の水撃現象に関する研究 : 第2報,圧力上昇値と伝播速度

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The characteristics of shock phenomena in a one-component two-phase bubbly flow induced by a sudden valve closure are investigated. The pressure rise and the propagation velocity of the pressure waves and their decay in the axial direction are obtained experimentally and are discussed quantitatively. Their characteristics are different from those of a two-component two-phase flow because of the mass transfer between the vapor and the liquid. The potential surge can be expressed by ΔP_<pso>=C_<TP>ρ_<TP>j_<TP> by extrapolating the value ΔP_<pso> at time t=0 before the occurrence of the mass transfer. The values of pressure rise and propagation velocity are also compared with the analytical results by the linearization method described in a previous report. It is shown that they can be expressed well in generalized forms which depend on the relaxation time τ_M of the mass transfer, obtained by the linearization method.
1987-11-25