Research Papers

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

[+] Author and Article Information
Kun Jia

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
School of Aerospace,
Xi'an Jiaotong University,
No. 28 West Xianning Road,
Xi'an 710049, China;
The State Key Laboratory of Fluid Power
Transmission and Control,
Zhejiang University,
No. 38 Zheda Road,
Hangzhou 310027, China
e-mail: kunjia@mail.xjtu.edu.cn

Ke-ji Yang

State Key Laboratory of Fluid Power
Transmission and Control,
Zhejiang University,
No. 38 Zheda Road,
Hangzhou 310027, China
e-mail: yangkj@zju.edu.cn

Bing-Feng Ju

State Key Laboratory of Fluid Power
Transmission and Control,
Zhejiang University,
No. 38 Zheda Road,
Hangzhou 310027, China
e-mail: mbfju@zju.edu.cn

1Corresponding author.

Contributed by the Noise Control and Acoustics Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received May 2, 2015; final manuscript received December 13, 2015; published online February 3, 2016. Assoc. Editor: Theodore Farabee.

J. Vib. Acoust 138(2), 021014 (Feb 03, 2016) (9 pages) Paper No: VIB-15-1149; doi: 10.1115/1.4032513 History: Received May 02, 2015; Revised December 13, 2015

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.

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Grahic Jump Location
Fig. 1

Schematic of our previous setup. The sound field is composed by three phase-controllable traveling plane waves with identical frequency and amplitude generated by PZT transducers. The distance between the cavity center and radiation surface is 25 mm.

Grahic Jump Location
Fig. 2

Distribution of the amplitude of oscillating first-order fields in the center area of the water-filled cavity with a 1.75-MHz incident ultrasound wave: (a) real part of pressure P1 and (b) absolute value of P1

Grahic Jump Location
Fig. 3

Time-averaged second-order fields in the water-filled cavity with three crossed 1.75-MHz incident attenuated ultrasound plane waves. (a) Color plot of the time-averaged second-order pressure field 〈p1〉. (b) Streaming pattern along with its relative magnitude; red arrows show the direction of streaming velocity. (c) Local streaming toward the positive direction of the z-axis. (d) Local streaming toward the left outlet. (e) Camera-recorded process where the particle is slipping off the trap of the potential well during transportation.

Grahic Jump Location
Fig. 4

The contour map for the acoustic potential well at different ε and ϕ : (a) ε=2, ϕ=120 deg; (b) ε=0.5, ϕ=120 deg; (c) ε=1, ϕ=110 deg; and (d) ε=0.5, ϕ=110 deg

Grahic Jump Location
Fig. 5

Optimized setup for particle transportation; three PZT transducers with rectangular radiating surface (10 × 25 mm2) are used and driven at a nominal thickness resonance frequency of 1.67 MHz. The angles between the axis of the upper transducer and the lower two are both 105 deg (ϕ=105 deg). The distance from the crossing of the axes to each transducer's surface is 25 mm.

Grahic Jump Location
Fig. 6

Constraint capability of the acoustic potential well in the optimized experimental setup. (a) Pressure distribution in the central region (λf×λf) after optimizing the acoustic parameter. (b) Contour map for force potential distribution together with force field. (c) The acoustic radiation force around the potential minimum at a series of concentric circles. (d) The elastic constant of the acoustic potential well.

Grahic Jump Location
Fig. 7

The average position fluctuations of the particle at each transporting step in the (a) x-axis and (b) z-axis transportation



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