Recent advances concerning acoustic radiation forces and torques and Wes Nyborg's helpful discussion of acoustic streaming

2012 ◽  
Vol 132 (3) ◽  
pp. 1907-1907
Author(s):  
Philip L. Marston ◽  
L. K. Zhang ◽  
David B. Thiessen
Keyword(s):  
Acoustic Radiation ◽  
Acoustic Streaming ◽  
Recent Advances ◽  
Radiation Forces

scholarly journals A numerical study of microparticle acoustophoresis driven by acoustic radiation forces and streaming-induced drag forces

Lab on a Chip ◽  
2012 ◽  
Vol 12 (22) ◽  
pp. 4617 ◽  
Author(s):  
Peter Barkholt Muller ◽  
Rune Barnkob ◽  
Mads Jakob Herring Jensen ◽  
Henrik Bruus
Keyword(s):  
Acoustic Radiation ◽  
Numerical Study ◽  
Drag Forces ◽  
Induced Drag ◽  
Radiation Forces

scholarly journals Acoustic radiation forces at liquid interfaces impact the performance of acoustophoresis

Lab on a Chip ◽  
2014 ◽  
Vol 14 (17) ◽  
pp. 3394-3400 ◽  
Author(s):  
Sameer Deshmukh ◽  
Zbigniew Brzozka ◽  
Thomas Laurell ◽  
Per Augustsson
Keyword(s):  
Acoustic Field ◽  
Speed Of Sound ◽  
Acoustic Radiation ◽  
Liquid Interfaces ◽  
Radiation Forces

Flow laminated liquids can relocate in a resonant acoustic field due to differences in density and speed of sound.

scholarly journals Acoustic Tweezers for Particle and Fluid Micromanipulation

2020 ◽  
Vol 52 (1) ◽  
pp. 205-234 ◽  
Author(s):  
M. Baudoin ◽  
J.-L. Thomas
Keyword(s):  
Optical Tweezers ◽  
Acoustic Radiation ◽  
Wide Spectrum ◽  
Acoustic Streaming ◽  
Input Power ◽  
Three Dimensions ◽  
Particle Sizes ◽  
Future Directions ◽  
Acoustic Radiation Pressure ◽  
Acoustic Tweezers

Acoustic tweezers powerfully enable the contactless collective or selective manipulation of microscopic objects. Trapping is achieved without pretagging, with forces several orders of magnitude larger than optical tweezers at the same input power, limiting spurious heating and enabling damage-free displacement and orientation of biological samples. In addition, the availability of acoustical coherent sources from kilo- to gigahertz frequencies enables the manipulation of a wide spectrum of particle sizes. After an introduction of the key physical concepts behind fluid and particle manipulation with acoustic radiation pressure and acoustic streaming, we highlight the emergence of specific wave fields, called acoustical vortices, as a means to manipulate particles selectively and in three dimensions with one-sided tweezers. These acoustic vortices can also be used to generate hydrodynamic vortices whose topology is controlled by the topology of the wave. We conclude with an outlook on the field's future directions.

Performance and Robustness Improvements in Ultrasonic Transportation Against Large-Scale Streaming

2016 ◽  
Vol 138 (2) ◽  
Author(s):  
Kun Jia ◽  
Ke-ji Yang ◽  
Bing-Feng Ju
Keyword(s):  
Elastic Constant ◽  
Lead Zirconate Titanate ◽  
Large Scale ◽  
Acoustic Radiation ◽  
Plane Waves ◽  
Acoustic Streaming ◽  
Sound Field ◽  
Radiation Force ◽  
Lead Zirconate ◽  
Potential Well

Acoustic streaming generated from the traveling-wave component of a synthesized sound field often has considerable influence on ultrasonic manipulations, in which the behavior of microparticles may be disturbed. In this work, the large-scale streaming pattern in a chamber with three incident plane waves is simulated, illustrating a directional traveling stream pattern and several vortical structures. Based on the numerical results, the trapping capability of an acoustic potential well is quantitatively characterized according to several evaluation criteria: the boundary and elastic constant of the acoustic potential well, the acoustic radiation force offset ratio, and the elastic constant offset ratio. By optimizing these parameters, the constraint of the acoustic potential well can be strengthened to promote the performance and robustness of the ultrasonic transportation. An ultrasonic manipulation device employing three 1.67-MHz lead zirconate titanate (PZT) transducers with rectangular radiation surface is prototyped and performance tested. The experimental results show that the average fluctuations of a microparticle during transportation have been suppressed into a region less than 0.01 times the wavelength. Particle displacement from equilibrium is no longer observed.

Experimental Studies in Fluid Mechanics and Materials Science Using Acoustic Levitation

1986 ◽  
Vol 87 ◽  
Author(s):  
E. H. Trinh ◽  
J. Robey ◽  
A. Arce ◽  
M. Gaspar
Keyword(s):  
Materials Science ◽  
Acoustic Radiation ◽  
Measurement Techniques ◽  
Experimental Studies ◽  
Direct Application ◽  
Acoustic Levitation ◽  
Low Gravity ◽  
Liquid Drops ◽  
Radiation Forces ◽  
Freely Suspended

AbstractGround-based and short-duration low gravity experiments have been carried out with the use of ultrasonic levitators to study the dynamics of freely suspended liquid drops under the influence of predominantly capillary and acoustic radiation forces. Some of the effects of the levitating field on the shape as well as the fluid flow fields within the drop have been determined. The development and refinement of measurement techniques using levitated drops with size on the order of 2mm in diameter have yielded methods having direct application to experiments in microgravity. In addition, containerless melting, undercooling, and freezing of organic materials as well as low melting metals have provided experimental data and observation on the application of acoustic positioning techniques to materials studies.

scholarly journals Measurement of the acoustic streaming pattern in a standing surface acoustic wave field

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Sebastian Sachs ◽  
Christian Cierpka ◽  
Jörg König
Keyword(s):  
Wave Field ◽  
Acoustic Waves ◽  
Acoustic Radiation ◽  
Electrical Power ◽  
Surface Acoustic Waves ◽  
Acoustic Streaming ◽  
Fluid Motion ◽  
Three Dimensional ◽  
Radiation Force ◽  
Flow Measurements

The application of standing surface acoustic waves (sSAW) has enabled the development of many flexible and easily scalable concepts for the fractionation of particle solutions in the field of microfluidic lab-ona-chip devices. In this context, the acoustic radiation force (ARF) is often employed for the targeted manipulation of particle trajectories, whereas acoustically induced flows complicate efficient fractionation in many systems [Sehgal and Kirby (2017)]. Therefore, a characterization of the superimposed fluid motion is essential for the design of such devices. The present work focuses on a structural analysis of the acousticallyexcited flow, both in the center and in the outer regions of the standing wave field. For this, experimental flow measurements were conducted using astigmatism particle tracking velocimetry (APTV) [Cierpka et al. (2010)]. Through multiple approaches, we address the specific challenges for reliable velocity measurements in sSAW due to limited optical access, the influence of the ARF on particle motion, and regions of particle depletion caused by multiple pressure nodes along the channel width and height. Variations in frequency, channel geometry, and electrical power allow for conclusions to be drawn on the formation of a complex, three-dimensional vortex structure at the beginning and end of the sSAW.

Acoustic radiation forces in monitoring of milk composition

2008 ◽  
Vol 123 (5) ◽  
pp. 3789-3789
Author(s):  
Diana Priev ◽  
Victor Ponomarev ◽  
Aba Priev
Keyword(s):  
Acoustic Radiation ◽  
Milk Composition ◽  
Radiation Forces
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