Simulation of drop dynamics in an acoustic positioning chamber

Min, Shermann; Holt, R. Glynn; Apfel, Robert E.

doi:10.1121/1.402854

Cited by 14 publications

(8 citation statements)

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“…Trinh et al (1986) used frequency switching between resonant standing waves to levitate and manoeuvre, in one dimension, hollow quartz spheres in air. Work by Min et al (1992) with Styrofoam spheres used a similar approach, but added the concept of trapping in a node of a particular mode, switching the excitation off to allow the particle to drop slightly before pulsing the excitation at that mode to provide a momentum kick, thus allowing the particle to be trapped in another mode by applying an excitation at a different frequency at an appropriate time. Another recent variation on this approach uses switching between two modes (a half wavelength and a quarter wavelength, respectively) to force particles to an equilibrium position between the nodes of the two modes .…”

Section: Introductionmentioning

confidence: 99%

Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

et al. 2011

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The ability to manipulate dense micrometre-scale objects in fluids is of interest to biosciences with a view to improving analysis techniques and enabling tissue engineering. A method of trapping micrometre-scale particles and manipulating them on a twodimensional plane is proposed and demonstrated. Phase-controlled counter-propagating waves are used to generate ultrasonic standing waves with arbitrary nodal positions. The acoustic radiation force drives dense particles to pressure nodes. It is shown analytically that a series of point-like traps can be produced in a two-dimensional plane using two orthogonal pairs of counter-propagating waves. These traps can be manipulated by appropriate adjustment of the relative phases. Four 5 MHz transducers (designed to minimize reflection) are used as sources of counter-propagating waves in a waterfilled cavity. Polystyrene beads of 10 mm diameter are trapped and manipulated. The relationship between trapped particle positions and the relative phases of the four transducers is measured and shown to agree with analytically derived expressions. The force available is measured by determining the response to a sudden change in field and found to be 30 pN, for a 30 V pp input, which is in agreement with the predictions of models of the system. A scalable fabrication approach to producing devices is demonstrated.

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Section: Introductionmentioning

confidence: 99%

Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

et al. 2011

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“…10 This work will also find application in the area of acoustic levitation in general. [11][12][13][14][15][16][17][18][19][20][21]51 We note that in the following development we refer to "particles," however, the theory presented applies equally well to particles and drops and indeed we study both in the experiments presented herein.…”

Section: Introductionmentioning

confidence: 85%

The directional sensitivity of the acoustic radiation force to particle diameter

Ran

Saylor

2015

The Journal of the Acoustical Society of America

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When viscous corrections to the inviscid acoustic radiation force theory are implemented and applied to a standing wave field, the direction of the acoustic radiation force on particles varies from theory to theory. Specifically, some theories predict that the direction of the force depends on the particle diameter, while others reveal that the direction of the force is independent of particle diameter. The present study is an experimental investigation of the direction of the acoustic radiation force which suggests that particle diameter does affect the direction. Experiments were conducted in air using an ultrasonic standing wave field with a nominal frequency of 30 kHz. Smoke particles and fine water droplets having a range of diameters were flowed into the region of a standing wave field. The direction of the acoustic radiation force was determined by observing whether the particles accumulated in the nodes or the anti-nodes of the standing wave. Results show a change in the direction of the acoustic radiation force at a particle diameter of 0.3±0.1 μm, which corresponds to a particle diameter to acoustic-boundary-layer thickness ratio of 0.023±0.008.

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“…11 In particular, the transportation of macro-particles is of great importance in micro-assembly 12 and life sciences. 13 Currently, there are four main approaches to trap and transport particles using acoustic waves: acoustical tweezers using focused transducers, 14,15 mode switching between resonant states, 16,17 linear array of transducers placed opposite to a reflector, 18 and standing wave as the sum of independent travelling waves. 19 Recently, an alternative implementation using the fourth method was proposed by Courtney.…”

Section: Introductionmentioning

confidence: 99%

Quantitative trap and long range transportation of micro-particles by using phase controllable acoustic wave

Jia

Yang

Mei

2012

Journal of Applied Physics

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Ultrasonic manipulations, which are widely used as a non-destructive and non-contact technology to trap and transport dense micrometer scale objects in fluids, are of interest to life sciences and micro-technology. In this study, a novel method of quantitatively trapping and transporting the micro-particles over a long range on a two dimensional plane by using phase controllable acoustic wave is proposed. Three phase-controlled piston transducers whose sound beam axes are arranged with an angle of 120° in the x-z plane are used to generate ultrasonic standing waves with arbitrary nodal positions. The synthesized sound field is scanned using a needle hydrophone, and the experimental data show good agreement with the calculated results. The acoustic radiation force drives dense particles towards a pressure node. By adjusting the phase of the lower two transducers, the particles can be transported in the horizontal and vertical direction quantitatively. The longest transporting range can be up to 3 mm. By varying the phase changing rate, the micro-particles can be transported at different velocities. The experimental results illustrate that the relationship between the position and phase show good agreement with the calculated results in the horizontal direction but some deviations in the vertical direction. The influences that may account for these deviations are also discussed.

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Simulation of drop dynamics in an acoustic positioning chamber

Cited by 14 publications

References 0 publications

Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

The directional sensitivity of the acoustic radiation force to particle diameter

Quantitative trap and long range transportation of micro-particles by using phase controllable acoustic wave

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