Abstract
Bubble formation is involved in many engineering applications. It is important to understand the dynamics of bubble formation. This work reports experimental and numerical results of bubble formation on submerged orifice under constant gas flow rate. Compressible large eddy simulation combined volume of fluid (VOF) was adopted in simulation and results was validated by experiment. Bubble formation is divided into three stages in this paper, expansion stage, elongation stage and pinch-off stage. In expansion stage, The bubble grows radially due to the incoming gas flux, but the bubble base remains attached to the orifice. But as gas injected, the spherical bubble will go into the elongation stage when the downward resultant force is lager than upward resultant force. And when bubble neck's length is bigger than √2Ro the bubble will go into pinch-off stage. Cylindrical Rayleigh-Plesset equation can be used to describe the pinch-off stage. Uncertain parameter r in it is given reference value in this paper.
Highlights
The process of bubble formation at submerged orifice is very significant in many engineering applications, such as bubble column, gas-liquid separator, cavitation, etc.Owning to its practical importance, the phenomenon of bubble formation and pitch-off has been widely studied theoretically and experimentally for decades.Sufficient investigations of bubble formation at submerged orifice have been reported, as described in articles of Zhang et al[1], Kumar et al[2,3,4]
Experiment and simulation of bubble formation on submerged orifice under constant gas flow rate were taken in this paper
Compressible large eddy simulation combined volume of fluid (VOF) was adopted in simulation and results were validated by experiment
Summary
The process of bubble formation at submerged orifice is very significant in many engineering applications, such as bubble column, gas-liquid separator, cavitation, etc. Burton J C(8) used cylindrical version of the general Rayleigh-Plesset equation and a 100000 frame-per-second video to analyze the pinch-off of nitrogen gas bubbles in fluids with a wide range of viscosity. They found a power law solution in. We showed our numerical and experimental work on bubble formation with experiment and simulation, including analysis on three stages of formation process and discussion on RayleighPlesset equation, etc It is hoped make some new reference to this phenomenon
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