EFFECT OF NOZZLE LENGTH ON GAS ENTRAPMENT CHARACTERISTICS OF VERTICAL LIQUID JET

Abstract

For a vertical plunging liquid jet system using nozzles which had various values of the length-to-diameter ratio L_m/D_n, characteristics such as the bubble penetration depth Z and the gas entrainment rate Q_g were studied experimentally in an air-water system. When nozzles of an L_m/D_n ratio exceeding 15 were employed, the values of Z and Qg were confirmed to be almost independent of L_m/D_n. Empirical correlations for predicting Z and Q_g are also presented.