Optical separation of ellipsoidal particles in a uniform flow

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The behavior of an ellipsoidal particle subjected to a vertical optical force by a loosely focused laser beam in a uniform flow was studied numerically. The fluid flow and the particle motion were separately solved and coupled using the penalty immersed boundary method, and the optical force was calculated using the dynamic ray tracing method. The optical force and optically induced torque on the ellipsoidal particle varied according to the aspect ratio and initial inclination angle. The ellipsoidal particle, whose major axis was initially aligned with the laser beam axis, was more migrated as the aspect ratio increased. The migration distance also depended on the initial inclination angle, even for a given ellipsoidal particle shape. As the laser beam power increased and the flow velocity decreased, the effect of the initial inclination angle increased. The ellipsoidal particles with different aspect ratios could be effectively separated if the rotation along the spanwise direction was suppressed. Moreover, the migration distance could be predicted analytically by introducing a new dimensionless number S-c to represent the ratio of the optical force to the viscous force for the ellipsoidal particles.
Publisher
AMER INST PHYSICS
Issue Date
2014-06
Language
English
Article Type
Article
Keywords

IMMERSED BOUNDARY METHOD; FOCUSED GAUSSIAN-BEAM; RADIATION FORCES; DIELECTRIC SPHERE; MANIPULATION; REGIME; CELLS; CHROMATOGRAPHY; SIMULATION; STRETCHER

Citation

PHYSICS OF FLUIDS, v.26, no.6

ISSN
1070-6631
DOI
10.1063/1.4880214
URI
http://hdl.handle.net/10203/192618
Appears in Collection
ME-Journal Papers(저널논문)
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