The acoustic force density acting on inhomogeneous fluids in acoustic fields

Abstract

We present a theory for the acoustic force density acting on inhomogeneous fluids in acoustic fields on time scales that are slow compared to the acoustic oscillation period. The acoustic force density depends on gradients in the density and compressibility of the fluid. For microfluidic systems, the theory predicts a relocation of the inhomogeneities into stable field-dependent configurations, which are qualitatively different from the horizontally layered configurations due to gravity. Experimental validation is obtained by confocal imaging of aqueous solutions in a glass-silicon microchip.

RevTex, 5 pages, 3 eps figures

References in corpus (1)

• Universal morphologies of fluid interfaces deformed by the radiation pressure of acoustic or electromagnetic waves

Cited by in corpus (20)

• Acoustic streaming and its suppression in inhomogeneous fluids
• Characterization of Acoustic Streaming in Gradients of Density and Compressibility
• Suppression of acoustic streaming in shape-optimized channels
• Particle-size-dependent acoustophoretic motion and depletion of micro- and nanoparticles at long time scales
• Theory of pressure acoustics with thermoviscous boundary layers and streaming in elastic cavities
• Acoustophoresis in polymer-based microfluidic devices: modeling and experimental validation
• Fast microscale acoustic streaming driven by a temperature-gradient-induced non-dissipative acoustic body force
• Acoustic Tweezing and Patterning of Concentration Fields in Microfluidics
• Bulk-driven acoustic streaming at resonance in closed microcavities
• Strong wave-mean-flow coupling in baroclinic acoustic streaming
• Theory of Nonlinear Acoustic Forces Acting on Inhomogeneous Fluids
• Numerical study of the coupling layer between transducer and chip in acoustofluidic devices
• Measurement of the acoustic radiation force on a sphere embedded in a soft solid
• On the stability of inhomogeneous fluids under acoustic fields
• Using surface acoustic waves to drive thin film flow over an obstacle
• Boundary-layer modeling of polymer-based acoustofluidic devices
• Acoustic modes of rapidly rotating ellipsoids subject to centrifugal gravity
• Aspect-ratio-dependent heat transport by baroclinic acoustic streaming
• Consistent continuum equations and numerical benchmarks for a perturbation-based, variable-coefficient acoustofluidic solver
• Theoretical aspects of microscale acoustofluidics