EFFECTS OF KINEMATIC VISCOSITY AND SURFACE TENSION ON GAS ENTRAPMENT RATE OF AN IMPINGING LIQUID JET

Abstract

The effects of the kinematic viscosity and the surface tension of aqueous solution on the gas entrainment rate of an impinging liquid jet were studied experimentally, using a straight cylindrical nozzle with a nozzle cap.
The three critical jet velocities at three transition points, respectively, on the gas entrainment curve increase with an increase of kinematic viscosity of the liquid. The gas entrainment rate of an impinging liquid jet tends to decrease in the initial entrainment region, while it tends to increase in the low jet velocity region, as kinematic viscosity increases. In the high jet velocity region, the effect of kinematic viscosity on gas entrainment rate is insignificant. The effect of the surface tension of the liquid on the gas entrainment rate and the three transition points is negligible.