GAS ENTRAINMENT BEHAVIOR OF VERTICAL PLUNGING LIQUID JETS IN TERMS OF CHANGES IN JET SURFACE LENGTH

For a vertical jet system using various liquids, the shape change of liquid jets discharged from nozzles having different nozzle aspect ratios was evaluated in terms of the surface length l(m) of the jet flow, and the relation between the change of l(m) and the gas entrainment behavior was investigated. It was found that the way of changing of l(m) with varying operating conditions or the liquids corresponded well to that of changing of the gas entrainment rate Q(g), that is, the change of l(m) of the jet before plunging could be closely related to the change of Q(g).