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Updated: Sep 3, 2025

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
Published on: August 21, 2018
A numerical lift force analysis on the inertial migration of a deformable droplet in steady and oscillatory
Ali Lafzi1, Sadegh Dabiri1,2
1Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, Indiana 47907, USA. alafzi@purdue.edu.
Abstract:
Inertial migration of deformable particles has become appealing in recent years due to its numerous applications in microfluidics and biomedicine. The physics underlying the motion of these particles is contingent upon the presence of lift forces in microchannels. Therefore, in this work, we present a lift force analysis for such migration of a deformable droplet in steady and oscillatory flow regimes and identify the effects of varying Capillary number and oscillation frequency on its dynamics. We then propose an expression that mimics the lift force behavior in oscillatory flows accurately. Finally, we introduce a procedure to derive and predict a simple expression for the steady and averaged oscillatory lift for any given combination of Capillary number and oscillation frequency within a continuous range.
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