Shape, Break Up Length and Operating Region of Liquid Jet Containing Small Solute Bubbles

Abstract

The shape, break up length and operating region of a liquid jet containing small solute bubbles were investigated experimentally by a photographic technique. The following results were obtained.
1) The diameter D_l and surface area S of the liquid jet containing small solute bubbles were correlated by the following equations :
D_l/D= (1+2gl/u₂²) ^-1/4
S/S₀= (2u₂²/3gl) {(1+2gl/u₂²) ^3/4-1}
where D is inside diameter of nozzle, g is acceleration of gravity, l is liquid jet length, u₂ is mean linear velocity of gas-liquid mixed fluid at nozzle exit and S₀=πDl.
2) The liquid jet containing small solute bubbles has only a region of turbulent liquid jet. A dimensionless break up length (l/D) is expressed by the following experimental equation as a function of Weber Number, We₂=ρ_LDu₂²/σ_L and opening ratio m.
l/D=75m^0.5We₂^0.15
3) The liquid jet containing small solute bubbles has three unstable operating regions, i. e., deformed jet region, flooding region and disintegrated jet region, and there exists an operating region which is limited by opening ratio m, minimum flow rate of liquid (Q_L) _min and maximum flow rate of liquid (Q_L) _max.