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Medientyp:
E-Artikel
Titel:
Development of particle migration in pressure-driven flow of a Brownian suspension
Beteiligte:
SEMWOGERERE, DENIS;
MORRIS, JEFFREY F.;
WEEKS, ERIC R.
Erschienen:
Cambridge University Press (CUP), 2007
Erschienen in:Journal of Fluid Mechanics
Sprache:
Englisch
DOI:
10.1017/s0022112007006088
ISSN:
0022-1120;
1469-7645
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>An experimental investigation into the influence of Brownian motion on shear-induced particle migration of monodisperse suspensions of micrometre-sized colloidal particles is presented. The suspension is pumped through a 50 μm × 500 μm rectangular cross-section glass channel. The experiments are characterized chiefly by the sample volume fraction (φ = 0.1 − 0.4), and the flow rate expressed as the Péclet number (<jats:italic>Pe</jats:italic> = 10 − 400). For each experiment we measure the entrance length, which is the distance from the inlet of the channel required for the concentration profile to develop to its non-uniform steady state. The entrance length increases strongly with increasing <jats:italic>Pe</jats:italic> for <jats:italic>Pe</jats:italic> ≪ 100, in marked contrast to non-Brownian flows for which the entrance length is flow-rate independent. For larger <jats:italic>Pe</jats:italic>, the entrance length reaches a constant value which depends on the other experimental parameters. Additionally, the entrance length decreases with increasing φ; this effect is strongest for low φ. Modelling of the migration based on spatial variation of the normal stresses due to the particles captures the primary features observed in the axial evolution over a range of <jats:italic>Pe</jats:italic> and φ.</jats:p>