Apparent wall slip velocity coefficients in concentrated suspensions of noncolloidal particles
- Levich Institute, T-1M, City College of the City University of New York, 140 Street and Convent Avenue, New York, New York 10031 (United States)
The apparent wall slip velocity coefficient of concentrated monodisperse suspensions of 90 {mu}m PMMA particles in a viscous Newtonian fluid was determined experimentally in a narrow gap Couette device by measuring the particle velocities across the gap using a laser doppler anemometer system and then extrapolating the results to the two walls. The slip coefficients thereby obtained were found to be insensitive to the magnitude of the applied shear rate and to equal, approximately, {lambda}/8 for particle concentrations {phi} in the range 0.45{le}{phi}{le}0.52, where {lambda} refers to the relative effective viscosity of the suspension with respect to that of the pure fluid. {copyright} {ital 1995} {ital Society} {ital of} {ital Rheology}
- DOE Contract Number:
- FG02-90ER14139; FG05-93ER79228
- OSTI ID:
- 124249
- Journal Information:
- Journal of Rheology, Journal Name: Journal of Rheology Journal Issue: 6 Vol. 39; ISSN 0148-6055; ISSN JORHD2
- Country of Publication:
- United States
- Language:
- English
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