Lateral migration of a microdroplet under optical forces in a uniform flow

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The behavior of a microdroplet in a uniform flow and subjected to a vertical optical force applied by a loosely focused Gaussian laser beam was studied numerically. The lattice Boltzmann method was applied to obtain the two-phase flow field, and the dynamic ray tracing method was adopted to calculate the optical force. The optical forces acting on the spherical droplets agreed well with the analytical values. The numerically predicted droplet migration distances agreed well with the experimentally obtained values. Simulations of the various flow and optical parameters showed that the droplet migration distance nondimensionalized by the droplet radius is proportional to the S number (z(d)/r(p) = 0.377S), which is the ratio of the optical force to the viscous drag. The effect of the surface tension was also examined. These results indicated that the surface tension influenced the droplet migration distance to a lesser degree than the flow and optical parameters. The results of the present work hold for the refractive indices of the mean fluid and the droplet being 1.33 and 1.59, respectively.
Publisher
AMER INST PHYSICS
Issue Date
2014-12
Language
English
Article Type
Article
Keywords

LATTICE BOLTZMANN METHOD; PARTICLE SEPARATION; BOUNDARY-CONDITIONS; MICROFLUIDICS; MANIPULATION; PRESSURE; DROPLETS; FRACTIONATION; MICROCHANNEL; CHEMISTRY

Citation

PHYSICS OF FLUIDS, v.26, no.12

ISSN
1070-6631
DOI
10.1063/1.4902174
URI
http://hdl.handle.net/10203/195227
Appears in Collection
ME-Journal Papers(저널논문)
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