Development of particle migration in pressure-driven flow of a Brownian suspension

@article{denismigrationmono, abstract = {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 P\'{e}clet number (<em>Pe</em> = 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 <em>Pe</em> for <em>Pe</em> ≪ 100, in marked contrast to non-Brownian flows for which the entrance length is flow-rate independent. For larger <em>Pe</em>, 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 <em>Pe</em> and φ.}, author = {Semwogerere, Denis and Morris, Jeffrey F. and Weeks, Eric R. }, citeulike-article-id = {2797775}, journal = {Journal of Fluid Mechanics}, keywords = {colloid, flow, qual}, number = {-1}, pages = {437--451}, posted-at = {2008-05-14 12:43:30}, priority = {2}, title = {Development of particle migration in pressure-driven flow of a Brownian suspension}, url = {http://journals.cambridge.org/action/displayAbstract?fromPage=online\&aid=1025984}, volume = {581}, year = {2007} }

TY - JOUR ID - denismigrationmono L3 - citeulike-article-id:2797775 TI - Development of particle migration in pressure-driven flow of a Brownian suspension JF - Journal of Fluid Mechanics VL - 581 IS - -1 SP - 437 EP - 451 N2 - 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 (<em>Pe</em> = 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 <em>Pe</em> for <em>Pe</em> ≪ 100, in marked contrast to non-Brownian flows for which the entrance length is flow-rate independent. For larger <em>Pe</em>, 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 <em>Pe</em> and φ. KW - colloid KW - flow KW - qual AU - Semwogerere, Denis AU - Morris, Jeffrey AU - Weeks, Eric PY - 2007//22/ UR - http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=1025984 ER -