Frequency dependence of elliptical particle motion of acoustic waves transmitted into the seabed from a point source in water

2005 ◽  
Vol 117 (4) ◽  
pp. 2503-2503
Author(s):  
David M. F. Chapman ◽  
Paul C. Hines ◽  
John C. Osler
Keyword(s):  
Point Source ◽  
Frequency Dependence ◽  
Particle Motion ◽  
Acoustic Waves

scholarly journals Acoustophoretic Control of Microparticle Transport Using Dual-Wavelength Surface Acoustic Wave Devices

Micromachines ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 52 ◽  
Author(s):  
Jin-Chen Hsu ◽  
Chih-Hsun Hsu ◽  
Yeo-Wei Huang
Keyword(s):  
Particle Motion ◽  
Acoustic Waves ◽  
Acoustic Pressure ◽  
Acoustic Radiation ◽  
Surface Acoustic Waves ◽  
Microfluidic Channel ◽  
Radiation Force ◽  
Dual Wavelength ◽  
Single Frequency ◽  
Motion Trajectories

We present a numerical and experimental study of acoustophoretic manipulation in a microfluidic channel using dual-wavelength standing surface acoustic waves (SSAWs) to transport microparticles into different outlets. The SSAW fields were excited by interdigital transducers (IDTs) composed of two different pitches connected in parallel and series on a lithium niobate substrate such that it yielded spatially superimposed and separated dual-wavelength SSAWs, respectively. SSAWs of a singltablee target wavelength can be efficiently excited by giving an RF voltage of frequency determined by the ratio of the velocity of the SAW to the target IDT pitch (i.e., f = cSAW/p). However, the two-pitch IDTs with similar pitches excite, less efficiently, non-target SSAWs with the wavelength associated with the non-target pitch in addition to target SSAWs by giving the target single-frequency RF voltage. As a result, dual-wavelength SSAWs can be formed. Simulated results revealed variations of acoustic pressure fields induced by the dual-wavelength SSAWs and corresponding influences on the particle motion. The acoustic radiation force in the acoustic pressure field was calculated to pinpoint zero-force positions and simulate particle motion trajectories. Then, dual-wavelength SSAW acoustofluidic devices were fabricated in accordance with the simulation results to experimentally demonstrate switching of SSAW fields as a means of transporting particles. The effects of non-target SSAWs on pre-actuating particles were predicted and observed. The study provides the design considerations needed for the fabrication of acoustofluidic devices with IDT-excited multi-wavelength SSAWs for acoustophoresis of microparticles.

Acoustic waves generated by a point source in a sloping fluid layer

1989 ◽  
Vol 85 (4) ◽  
pp. 1414-1426 ◽  
Author(s):  
Yih‐Hsing Pao ◽  
Franz Ziegler ◽  
Yi‐Sun Wang
Keyword(s):  
Point Source ◽  
Acoustic Waves ◽  
Fluid Layer

scholarly journals Unsteady particle motion in an acoustic standing wave field

2019 ◽  
Author(s):  
S. Wanga ◽  
J. S. Allen ◽  
A. M. Ardekani
Keyword(s):  
Wave Field ◽  
Standing Wave ◽  
Particle Motion ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Particle Interaction ◽  
Inertial Force ◽  
Radiation Force ◽  
Acoustic Standing Wave ◽  
Standing Wave Field

The acoustic-based separation has attracted considerable attention in biomedical research, such as sorting of cells and particles. Current design principles used for acoustic systems are based on the steady Stokes theory, equating the Stokes drag with the primary radiation force. However, this approach is not valid for large cells/particles or in the presence of particle–particle interaction. In this work,we analytically examine unsteady inertial affects and particle–particle hydrodynamic interaction on the particle motion in a viscous fluid in the presence of an acoustic standing wave field. Comparing our results to the steady Stokes theory, we find that the unsteady inertial force decreases the particle’s velocity, while particle–particle interaction enhances it. For a particular acoustic-based separation approach ‘tilted-angle standing surface acoustic waves (taSSAW)’, we find that both effects of unsteady inertial force and particle–particle interaction are evident and should be considered for O(10μm) particles or larger. Our study improves the current predictions of particle trajectory in acoustic-based separation devices.

The Frequency Dependence of Quantized Current Plateaus Induced by Surface Acoustic Waves Through a Quantum Point Contact

2009 ◽  
Vol 55 (6) ◽  
pp. 2482-2485 ◽  
Author(s):  
Yunchul Chung ◽  
Minky Seo ◽  
Hana Kim ◽  
Nam Kim ◽  
Byung-Chill Woo ◽  
...  
Keyword(s):  
Frequency Dependence ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Point Contact ◽  
Quantum Point Contact ◽  
Quantum Point

Acoustic waves: a finite difference film

1983 ◽  
Vol 20 (3) ◽  
pp. 506-508
Author(s):  
George McMechan ◽  
Bill Price
Keyword(s):  
Finite Difference ◽  
Point Source ◽  
Acoustic Waves ◽  
Time Frame ◽  
Two Dimensional ◽  
Acoustic Wave Equation ◽  
Dimensional Model ◽  
Varying Thickness ◽  
Finite Difference Solution ◽  
Circular Wavefront

A finite difference solution of the acoustic wave equation is an ideal basis for making movies since the computations naturally provide a series of frames at successive, discrete time increments. Each time frame contains a picture of the wave field present at that time. An example is illustrated in a short (~2.8 Min) 16 mm film that shows the dynamic response of a two-dimensional model to a point source. The model consists of a layer of varying thickness that overlies a half space. The film shows the point source expanding into a circular wavefront that is reflected, refracted, and diffracted by the model.

Acoustic waves generated by a laser point source in an isotropic cylinder

2004 ◽  
Vol 116 (2) ◽  
pp. 814-820 ◽  
Author(s):  
Yongdong Pan ◽  
Clément Rossignol ◽  
Bertrand Audoin
Keyword(s):  
Point Source ◽  
Acoustic Waves ◽  
Isotropic Cylinder
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