Premium
Bubble Formation at Variously Inclined Nozzles
Author(s) -
Scargiali Francesca,
Busciglio Antonio,
Grisafi Franco,
Brucato Alberto
Publication year - 2014
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300511
Subject(s) - bubble , nozzle , body orifice , mechanics , entrainment (biomusicology) , liquid bubble , materials science , physics , thermodynamics , engineering , acoustics , mechanical engineering , rhythm
Bubble formation at variously inclined submerged nozzles, fed with a continuous gas flow rate, is investigated. The average liquid velocity induced by bubble motion is determined, leading to a simple correlation for estimation of the liquid velocities induced by the repeated passage of bubbles. An effective model for the prediction of bubble sizes at their detachment from vertical nozzle orifices is presented which encompasses a bound expansion stage, followed by an accelerated expansion phase, and ends by an original bubble detachment criterion. The existence of a liquid‐phase effective entrainment velocity, generated by the continuous passage of the bubble stream, is quantified and included in the model. Model predictions are found to correlate well with experimental and literature data.