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ChemEngineering 2018, 2(2), 16;

Study of Bubble Size, Void Fraction, and Mass Transport in a Bubble Column under High Amplitude Vibration

Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74074, USA
Sandia National Laboratories, Albuquerque, NM 87123, USA
Author to whom correspondence should be addressed.
Received: 16 March 2018 / Revised: 6 April 2018 / Accepted: 10 April 2018 / Published: 17 April 2018
(This article belongs to the Special Issue Bubble Column Fluid Dynamics)
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Vertical vibration is known to cause bubble breakup, clustering and retardation in gas-liquid systems. In a bubble column, vibration increases the mass transfer ratio by increasing the residence time and phase interfacial area through introducing kinetic buoyancy force (Bjerknes effect) and bubble breakup. Previous studies have explored the effect of vibration frequency (f), but minimal effort has focused on the effect of amplitude (A) on mass transfer intensification. Thus, the current work experimentally examines bubble size, void fraction, and mass transfer in a bubble column under relatively high amplitude vibration (1.5 mm < A <9.5 mm) over a frequency range of 7.5–22.5 Hz. Results of the present work were compared with past studies. The maximum stable bubble size under vibration was scaled using Hinze theory for breakage. Results of this work indicate that vibration frequency exhibits local maxima in both mass transfer and void fraction. Moreover, an optimum amplitude that is independent of vibration frequency was found for mass transfer enhancements. Finally, this work suggests physics-based models to predict void fraction and mass transfer in a vibrating bubble column. View Full-Text
Keywords: bubble column; vibration; bubble size; void fraction; mass transfer bubble column; vibration; bubble size; void fraction; mass transfer

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Mohagheghian, S.; Still, A.L.; Elbing, B.R.; Ghajar, A.J. Study of Bubble Size, Void Fraction, and Mass Transport in a Bubble Column under High Amplitude Vibration. ChemEngineering 2018, 2, 16.

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