Modeling of Microdevices for SAW-Based Acoustophoresis — A Study of Boundary Conditions

Skov, Nils Refstrup; Bruus, Henrik

doi:10.3390/mi7100182

Cited by 30 publications

(16 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The product is a fully-validated model with predictions that agree quantitatively very well with the experimental findings. The results reveal the hitherto unknown particle trajectories and dispel the current ambiguities in the literature concerning the streaming direction as well as the critical particle transition size [14,15,[17][18][19]. Further, through a combination of the numerical and experimental results, we have predicted the pseudo-standing first-order fields p 1 as well as the substrate displacement amplitude ζ 0 .…”

Section: Discussionsupporting

confidence: 72%

“…In the light of former reports in the literature [18,19], it is an important finding that the simple reduced-fluid model, which neglects the substrate and wall internal dynamics, predicts the major experimental trends accurately. To test the model even further, we show in Fig.…”

Section: B Numerical Predictionsmentioning

confidence: 94%

“…Recently, several numerical models have attempted to answer these questions [14][15][16][17][18][19]. Some reported models represent the polymer walls with hard or leaky boundary conditions [14][15][16][17], while others solve the full set of constitutive equations [18,19], albeit either neglecting the typically large viscous wall damping or by overlooking the importance of wall thickness. The validity of the assumptions and approximations is not evident due to the lack of precise measurement of quantities such as particle motion subject to radiation and streaming-drag forces.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acoustically Driven Fluid and Particle Motion in Confined and Leaky Systems

et al. 2018

View full text Add to dashboard Cite

The acoustic motion of fluids and particles in confined and acoustically-leaky systems is receiving increasing attention for its use in medicine and biotechnology. Currently a number of contradicting physical and numerical models exist but their validity is uncertain due to the unavailability of hard-to-access experimental data for validation. We provide experimental benchmarking data by measuring 3D particle trajectories and demonstrate that the particle trajectories can be described numerically without any fitting parameter by a reduced-fluid model with leaky impedance wall conditions. The results reveal the hitherto unknown existence of a pseudo-standing wave that drives the acoustic streaming as well as the acoustic radiation force on suspended particles.

show abstract

Section: Discussionsupporting

confidence: 72%

Section: B Numerical Predictionsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acoustically Driven Fluid and Particle Motion in Confined and Leaky Systems

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The design, evaluation, and optimization of such devices require dealing with wave-PDMS interactions, e.g., wave absorption, reflection, propagation, resonance, and acoustic impedance matching [17,18,20,21]. In the prediction of resonance frequencies in all-PDMS BAW devices, accurate parameters describing the elasticity and viscosity of PDMS are required [18].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Characterization of Polydimethylsiloxane for Microscale Acoustofluidics

Chen

et al. 2020

Phys. Rev. Applied

Self Cite

View full text Add to dashboard Cite

 Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

show abstract

“…The following formulation of the governing equations is a further development of our previous work presented in Refs. [32,35,36] to take into account the SAW in 3D models of lithium niobate-driven ultrasound acoustics in liquid-filled microchannels.…”

Section: The Model Saw System and The Governing Equationsmentioning

confidence: 99%

Three-Dimensional Numerical Modeling of Surface-Acoustic-Wave Devices: Acoustophoresis of Micro- and Nanoparticles Including Streaming

et al. 2019

Self Cite

View full text Add to dashboard Cite

Surface-acoustic-wave (SAW) devices form an important class of acoustofluidic devices, in which acoustic waves are generated and propagate along the surface of a piezoelectric substrate. Despite their widespread use, only a few fully three-dimensional (3D) numerical simulations have been reported in the literature. In this paper, we present a 3D numerical simulation taking into account the electromechanical fields of the piezoelectric SAW device, the acoustic displacement field in the attached elastic material, in which a liquid-filled microchannel is embedded, the acoustic fields inside the microchannel, and the resulting acoustic radiation force and streaming-induced drag force acting on micro-and nanoparticles suspended in the microchannel. A specific device design is presented, for which numerical predictions of the acoustic resonances and the acoustophoretic response of suspended microparticles in three dimensions are successfully compared with experimental observations. The simulations provide a physical explanation of the observed qualitative difference between devices with acoustically soft and hard lids in terms of traveling and standing waves, respectively. The simulations also correctly predict the existence and position of the observed in-plane streaming-flow rolls. The simulation model presented may be useful in the development of SAW devices optimized for various acoustofluidic tasks.

show abstract

Modeling of Microdevices for SAW-Based Acoustophoresis — A Study of Boundary Conditions

Cited by 30 publications

References 53 publications

Acoustically Driven Fluid and Particle Motion in Confined and Leaky Systems

Acoustically Driven Fluid and Particle Motion in Confined and Leaky Systems

Acoustic Characterization of Polydimethylsiloxane for Microscale Acoustofluidics

Three-Dimensional Numerical Modeling of Surface-Acoustic-Wave Devices: Acoustophoresis of Micro- and Nanoparticles Including Streaming

Contact Info

Product

Resources

About