Lateral migration and focusing of microspheres in a microchannel flow of viscoelastic fluids

The lateral migration of microspheres across streamlines induced by elasticity and inertia in a square microchannel flow of viscoelastic fluids is investigated using a holographic microscopy technique. We experimentally demonstrate the exact particle positions driven by the elasticity of fluid in th...

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Bibliographic Details
Published in:Physics of fluids (1994) 2014-06, Vol.26 (6)
Main Authors: Seo, Kyung Won, Kang, Yang Jun, Lee, Sang Joon
Format: Article
Language:English
Subjects:
Elasticity
Flow velocity
Fluid dynamics
Fluid flow
Inertia
Microchannels
Microspheres
Physics
Three dimensional analysis
Viscoelastic fluids
Viscoelasticity
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Summary:The lateral migration of microspheres across streamlines induced by elasticity and inertia in a square microchannel flow of viscoelastic fluids is investigated using a holographic microscopy technique. We experimentally demonstrate the exact particle positions driven by the elasticity of fluid in the channel cross-section. The effects of the blockage ratio, flow rate, and shear-thinning property of the viscoelastic fluids on particle migration are evaluated. In particular, the focusing patterns of microspheres in three-dimensional volume are analyzed under different conditions, namely, dominant inertia, dominant elasticity, and the combined effects of inertia and elasticity.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.4882265