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Bubble formation from sub-millimeter orifices under variable gas flow conditions
We provide an experimental investigation on the mechanism of the bubble formation from sub-millimeter orifices under variable gas flow conditions VGFC. The effect of influential parameters including the volumetric gas flow rate Q, the orifice diameter dor, and the volume of the gas reservoir Vc upstream of the orifice are investigated in detail. We found that, by enlarging Vc, q increases. This affects various aspects of bubble formation dynamics such as the bubble base expansion, the apparent contact angle at the three-phase contact point, and the bubble detachment criterion. The effect of Vc is best presented by its dimensionless group, the capacitance number Nc. The minimum Nc from which the influence of the gas reservoir becomes important depends on the orifice size. Moreover, a significant increase in Vc leads to a change in the bubbling regime towards multiple bubble formation.
Keywords: Bubble formation; Sub-millimeter orifice; Gas reservoir; Bubble dynamics
- Data for: Bubble formation from sub-millimeter orifices … (Id 32655) HZDR-primary research data are used by this (Id 32653) publication
Chemical Engineering Science 242(2021), 116698