Bubbly flow and gas–liquid mass transfer in square and circular microchannels for stress-free and rigid interfaces: CFD analysis
- 413 Downloads
In this paper, the dynamics of bubbles and the mass transfer between bubbles and the surrounding liquid in square and circular microchannels are investigated, in the bubbly flow regime. For this purpose, a computational fluid dynamics analysis is used to carry out numerical simulations of the liquid flow and the mass transport around a spherical bubble in a square or a circular microchannel, for a stress-free or a rigid gas–liquid interface. The corresponding results are consolidated into correlations to calculate the bubble velocity and the interfacial rate of mass transfer as functions of the control parameters of the system. For each considered case, the flow structure, the concentration field around the bubble and the local interfacial rate of mass transfer are presented and shown to be intricately related.
KeywordsMicrofluidics Absorption Square microchannel Circular microchannel Bubbles Spherical bubbles CFD
The authors gratefully acknowledge Louise De Cannière for her assistance in numerical simulations. The authors also acknowledge Jean-Christophe Baret, Charles Baroud and Pierre Miquel for fruitful discussions. D.M. and B.S. acknowledge the Fonds de la Recherche Scientifique (F.R.S.–F.N.R.S.) for its financial support. This research has been performed under the umbrella of the COST action MP1106 and also took part in the Inter-university Attraction Pole Programme (IAP 7/38 MicroMAST) initiated by the Belgian Science Policy Office.
- Bruus H (2008) Theoretical microfluidics, vol 18. Oxford University Press, Oxford, pp 41–50 and 75 Google Scholar
- Bird RB, Stewart WE, Lightfoot EN (2007) Transport phenomena. Wiley, New York, pp 100, 636 and 677–678Google Scholar
- Clift R, Grace JR, Weber ME (1978) Bubbles, drops and particles. Academic Press, New YorkGoogle Scholar
- Coulson JM, Richardson JF (1991) Chemical engineering volume 2: particle technology and separation, 4th edn. Pergamon Press, OxfordGoogle Scholar
- Dani A, Cockx A, Guiraud P (2006) Direct numerical simulation of mass transfer from spherical bubbles: the effect of interface contamination at low Reynolds numbers. Int J Chem React Eng 4(1):1542Google Scholar
- Haberman WL, Morton RK (1953) An experimental investigation of the drag and shape of air bubbles rising in various liquids. David Taylor Model Basin, Report 802Google Scholar
- Levich VG (1962) Physicochemical hydrodynamics, vol 689. Prentice-Hall, Englewood Cliffs, NJ, pp 84–85 and 467Google Scholar
- Mikaelian D, Haut B, Scheid B (2015) Bubbly flow and gas-liquid mass transfer in square and circular microchannels for stress-free and rigid interfaces: dissolution model. Microfluid Nanofluid (in revision)Google Scholar