The Characteristics of Water and Bubbling Jets in a Cylindrical Vessel with Bottom Blowing

Abstract

Experimental conditions of bubbling jets were chosen in the intermediate gas flow rate regime where the size and the shape of bubbles are mainly determined by nozzle size and gas flow rate. The velocity of liquid in bubbling jets were measured by making use of LDV (Laser Doppler Velocimeter). The radial and axial distributions of them were related to the behaviour of rising bubbles. The empirical expressions for the mean velocity and root mean square value of velocity fluctuation on the center-line were presented as functions of gas flow rate. Also, water jets in the same vessel were measured to confirm the applicability of LDV system and to clarify the effect of side wall on the confined jets.