Inertial forces for particle manipulation near oscillating interfaces

Siddhansh Agarwal, Bhargav Rallabandi, Sascha Hilgenfeldt

Research output: Contribution to journalArticle

Abstract

Due to the inherent nonlinearity of fluid dynamics, a large class of oscillating flows gives rise to rectified effects of steady motion. It has recently been shown that particle transport in such flows leads to differential displacement and efficient sorting of microparticles. Here we present a model that generalizes a Maxey-Riley-like equation for particle motion, incorporating important viscous and inviscid effects near oscillating interfaces and efficiently bridging the acoustofluidic and microfluidic approaches. Resulting in direct predictions for particle motion on slower timescales, the model predicts a richer and qualitatively different behavior from that expected from simplified radiation-force formalisms: depending on experimental control parameters, the net effect of interfacial oscillation can be either an attraction to or a repulsion from the interface, and particles can be captured at a fixed distance or released. These results are verified in comparison with experiments.

Original languageEnglish (US)
Article number104201
JournalPhysical Review Fluids
Volume3
Issue number10
DOIs
StatePublished - Oct 1 2018

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Manipulation
Oscillating flow
Motion
Fluid dynamics
Sorting
Microfluidics
Particle Transport
Fluid Dynamics
Radiation
Control Parameter
Time Scales
Nonlinearity
Oscillation
Predict
Generalise
Prediction
Experiments
Model
Experiment
Class

ASJC Scopus subject areas

  • Computational Mechanics
  • Modeling and Simulation
  • Fluid Flow and Transfer Processes

Cite this

Inertial forces for particle manipulation near oscillating interfaces. / Agarwal, Siddhansh; Rallabandi, Bhargav; Hilgenfeldt, Sascha.

In: Physical Review Fluids, Vol. 3, No. 10, 104201, 01.10.2018.

Research output: Contribution to journalArticle

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