Skip to Main content Skip to Navigation
Journal articles

Gas―liquid flow stability and bubble formation in non-Newtonian fluids in microfluidic flow-focusing devices

Abstract : This communication describes the gas―liquid two-phase flow patterns and the formation of bubbles in non-Newtonian fluids in microfluidic flow-focusing devices. Experiments were conducted in two different polymethyl methacrylate (PMMA) square microchannels of, respectively, 600 x 600 and 400 x 400 μm. N2 bubbles were generated in non-Newtonian polyacrylamide (PAAm) solutions of different concentrations. Slug bubble, missile bubble, annular and intermittent flow patterns were observed at the cross-junction by varying gas and liquid flow rates. Gas and liquid flow rates, concentration of PAAm solutions, and channel size were varied to investigate their effect on the mechanism of bubble formation. The bubble size was proportional to the ratio of gas/ liquid flow rate for slug bubbles and could be scaled with the ratio of gas/liquid flow rate as a power―law relationship for missile bubbles under wide experimental conditions.
Document type :
Journal articles
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-00606319
Contributor : Josiane Moras <>
Submitted on : Wednesday, July 6, 2011 - 9:21:38 AM
Last modification on : Monday, March 29, 2021 - 4:06:11 PM

Links full text

Identifiers

Collections

Citation

T. Fu, Y. Ma, D. Funfschilling, H.Z. Li. Gas―liquid flow stability and bubble formation in non-Newtonian fluids in microfluidic flow-focusing devices. Microfluidics and Nanofluidics, Springer Verlag, 2011, 10 ((5)), pp. 1135-1140. ⟨10.1007/s10404-010-0741-x⟩. ⟨hal-00606319⟩

Share

Metrics

Record views

98