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Issue 12, 2015
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Numerical study of acoustophoretic motion of particles in a PDMS microchannel driven by surface acoustic waves

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Abstract

We present a numerical study of the acoustophoretic motion of particles suspended in a liquid-filled PDMS microchannel on a lithium niobate substrate acoustically driven by surface acoustic waves. We employ a perturbation approach where the flow variables are divided into first- and second-order fields. We use impedance boundary conditions to model the PDMS microchannel walls and we model the acoustic actuation by a displacement function from the literature based on a numerical study of piezoelectric actuation. Consistent with the type of actuation, the obtained first-order field is a horizontal standing wave that travels vertically from the actuated wall towards the upper PDMS wall. This is in contrast to what is observed in bulk acoustic wave devices. The first-order fields drive the acoustic streaming, as well as the time-averaged acoustic radiation force acting on suspended particles. We analyze the motion of suspended particles driven by the acoustic streaming drag and the radiation force. We examine a range of particle diameters to demonstrate the transition from streaming-drag-dominated acoustophoresis to radiation-force-dominated acoustophoresis. Finally, as an application of our numerical model, we demonstrate the capability to tune the position of the vertical pressure node along the channel width by tuning the phase difference between two incoming surface acoustic waves.

Graphical abstract: Numerical study of acoustophoretic motion of particles in a PDMS microchannel driven by surface acoustic waves

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Publication details

The article was received on 26 Feb 2015, accepted on 05 May 2015 and first published on 22 May 2015


Article type: Paper
DOI: 10.1039/C5LC00231A
Author version available: Download Author version (PDF)
Citation: Lab Chip, 2015,15, 2700-2709
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    Numerical study of acoustophoretic motion of particles in a PDMS microchannel driven by surface acoustic waves

    N. Nama, R. Barnkob, Z. Mao, C. J. Kähler, F. Costanzo and T. J. Huang, Lab Chip, 2015, 15, 2700
    DOI: 10.1039/C5LC00231A

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