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Residual film thickness following immiscible fluid displacement in noncircular microchannels at large capillary number
Author(s) -
Lu Yu,
Kovalchuk Nina M.,
Simmons Mark J. H.
Publication year - 2018
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16178
Subject(s) - capillary action , pulmonary surfactant , capillary number , displacement (psychology) , materials science , residual , chemistry , viscosity , mechanics , hydraulic diameter , chromatography , composite material , reynolds number , physics , mathematics , turbulence , psychology , algorithm , psychotherapist , biochemistry
An experimental study of the displacement of one immiscible fluid by another was performed in microchannels with circular, square and near‐semicircular cross‐sections, with hydraulic diameters from 100 to 200 μm. Experiments were performed over a range of capillary number, Ca, from 0.02 < Ca < 80, with viscosity ratios between the two fluids ranging from 20 to 100. The liquid film left on the channel wall following the advance of the displacing fluid was obtained from visual measurements and a method for the estimation of mean film thickness was shown to be in good agreement with existing correlations. The addition of a surfactant (Sodium Dodecyl Sulfate, SDS) dissolved in the displacing fluid led to a reduction in the thickness of the residual film. © 2018 The Authors AIChE Journal published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers AIChE J , 64: 3456–3466, 2018