3D measurement and simulation of surface acoustic wave driven fluid motion: a comparison

A method for a droplet transportation by jumping a obstacle on piezoelectric substrate is presented, and a device for the droplet transportation is implemented on a 128° yx-LiNbO3 piezoelectric substrate. An interdigital transducer and a reflector are fabricated on the piezoelectric substrate using microelectric technology. Hydrophobic film is coated on the area free of electrodes and a polydimethylsilicone obstacle is mounted on it. A radio frequency signal amplified by a power amplifier is applied to the interdigital transducer to generate surface acoustic wave. When the surface acoustic wave meets with the droplet on the piezoelectric substrate during transportation, part of acoustic wave enegy is radiated into the droplet, leading to internal acoustic streaming. Once the radio frequency signal with appropriate amplitude is suddenly decreased, part of the droplet will jump the obstacle due to interial force. Red dye solution drops are demonstrated for transportation experiments. Results show that a droplet can be transported from one side to another of the obstacle on piezoelectric substrate by help of surface acoustic wave. The presented method is helpful for microfluidic system on a piezoelectric substrate.

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Three-dimensional numerical simulation and experimental investigation of boundary-driven streaming in surface acoustic wave microfluidics

Lab on a Chip ◽

10.1039/c8lc00589c ◽

2018 ◽

Vol 18 (23) ◽

pp. 3645-3654 ◽

Cited By ~ 11

Author(s):

Chuyi Chen ◽

Steven Peiran Zhang ◽

Zhangming Mao ◽

Nitesh Nama ◽

Yuyang Gu ◽

...

Keyword(s):

Numerical Simulation ◽

Experimental Investigation ◽

Acoustic Wave ◽

Surface Acoustic Wave ◽

Slip Velocity ◽

Acoustic Streaming ◽

Three Dimensional

We investigated the 3D acoustic streaming activated by the IDT immersed in the oil by experimental investigation and numerical simulation using the “slip velocity method”.

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Flexible surface acoustic wave devices and its applications in microfluidics

MRS Proceedings ◽

10.1557/opl.2014.33 ◽

2014 ◽

Vol 1659 ◽

pp. 27-33

Author(s):

Jian Zhou ◽

Xingli He ◽

Wenbo Wang ◽

Nana Hu ◽

Hao Jin ◽

...

Keyword(s):

Acoustic Wave ◽

Surface Acoustic Wave ◽

Flexible Electronics ◽

Lamb Waves ◽

Acoustic Streaming ◽

Plastic Films ◽

Saw Devices ◽

Flexible Surface ◽

Developed Surface ◽

Acoustic Wave Devices

Abstract:Flexible electronics and microsystems are an emerging technology with a tremedous impact to the future electronics and information technology and widespread applications. Various devices and microsystems have been developed. Surface acoustic wave (SAW) devices are a type of essential device for electronics, microsensors and microsystems; however there is no activity on the development of flexible SAW devices yet. This paper reports the development of flexible SAW devices on cheap, bendable and disposable plastic films. Flexible SAW devices with resonant frequency of 198.1 MHz and 447 MHz for the Rayleigh and Lamb waves respectively have been obtained with a large transmission signal up to 18dB. The flexible SAW devices have also demonstrated their ability for acoustic streaming with a velocity up to 3.4 cm/s and for particle concentration. The results have clearly demonstrated that the flexible SAW devices have great potential for applications in electronics and microsystems.

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Challenges in Modeling the Unsteady Aerodynamics of Wind Turbines

ASME 2002 Wind Energy Symposium ◽

10.1115/wind2002-37 ◽

2002 ◽

Cited By ~ 27

Author(s):

J. Gordon Leishman

Keyword(s):

Velocity Field ◽

Wind Turbines ◽

Unsteady Aerodynamics ◽

Dynamic Stall ◽

Experimental Measurements ◽

Fundamental Limits ◽

Unsteady Aerodynamic ◽

Modeling Techniques ◽

Induced Velocity

Many of the aerodynamic phenomena contributing to the observed effects on wind turbines are now known, but the details of the flow are still poorly understood and are challenging to predict accurately, issues discussed herein include the modeling of the induced velocity field produced by the vortical wake behind the turbine, the various unsteady aerodynamic issues associated with the blade sections, and the intricacies of dynamic stall. Fundamental limits exist in the capabilities of all models, and misunderstandings or ambiguities can also arise in how these models should be properly applied. A challenge for analysts is to use complementary experimental measurements and modeling techniques to better understand the aerodynamic problems found on wind turbines, and to develop more rigorous models with wider ranges of application.

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ZnO film thickness effect on surface acoustic wave modes and acoustic streaming

Applied Physics Letters ◽

10.1063/1.2970960 ◽

2008 ◽

Vol 93 (9) ◽

pp. 094105 ◽

Cited By ~ 85

Author(s):

X. Y. Du ◽

Y. Q. Fu ◽

S. C. Tan ◽

J. K. Luo ◽

A. J. Flewitt ◽

...

Keyword(s):

Acoustic Wave ◽

Film Thickness ◽

Surface Acoustic Wave ◽

Acoustic Streaming ◽

Thickness Effect ◽

Zno Film ◽

Wave Modes

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Enhancement of acoustic streaming induced flow on a focused surface acoustic wave device: Implications for biosensing and microfluidics

Journal of Applied Physics ◽

10.1063/1.3279687 ◽

2010 ◽

Vol 107 (2) ◽

pp. 024503 ◽

Cited By ~ 6

Author(s):

Reetu Singh ◽

Subramanian K. R. S. Sankaranarayanan ◽

Venkat R. Bhethanabotla

Keyword(s):

Acoustic Wave ◽

Surface Acoustic Wave ◽

Acoustic Streaming ◽

Surface Acoustic Wave Device ◽

Induced Flow ◽

Acoustic Wave Device ◽

Wave Device

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Splitting Drops on a Piezoelectric Substrate by Help of Surface Acoustic Wave

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.336-338.80 ◽

2013 ◽

Vol 336-338 ◽

pp. 80-83

Author(s):

Ai Liang Zhang ◽

Xiang Ting Fu ◽

Yan Zha

Keyword(s):

Acoustic Wave ◽

Surface Acoustic Wave ◽

Biochemical Analysis ◽

Acoustic Streaming ◽

Microfluidic System ◽

Preparation Technique ◽

Sample Preparation Technique ◽

Interdigital Transducer ◽

Red Dye ◽

Piezoelectric Substrate

A new method for splitting drops on a piezoelectric substrate is presented. An interdigital transducer with the period of 144μm is fabricated on a 128° yx-LiNbO3piezoelectric substrate using microelectric technology. Intermittent surface acoustic wave is generated by an on-to-off radio frequency signal, which is applied to the interdigital transducer, and then radiates into a drop on the acoustic path of the piezoelectric substrate, leading to discontinuous acoustic streaming. A part of the drop is split due to inertia when the surface acoustic wave is suddenly disappeared. Red dye solution drops are demonstrated for fission experiments, and mixture operation of two drops is also implemented using the fission method. Results show that a drop can be split by help of surface acoustic wave, and the distance of two daughters is determined on the volume of the drop. The presented drop fission method provides a new sample preparation technique, which is helpful for microfluidic biochemical analysis in a microfluidic system.

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The Dynamics of SAW Streaming and its Application to Fluid Devices

MRS Proceedings ◽

10.1557/proc-360-53 ◽

1994 ◽

Vol 360 ◽

Cited By ~ 25

Author(s):

Showko Shiokawa ◽

Yoshikazu Matsui

Keyword(s):

Acoustic Wave ◽

Surface Acoustic Wave ◽

Frequency Spectrum ◽

Liquid Surface ◽

Water Drop ◽

Acoustic Streaming ◽

Nonlinear Behavior ◽

Single Pulse ◽

Pulse Frequency ◽

Bubble Oscillation

AbstractVarious liquid motions such as streaming and droplet formation on the surface of surface acoustic wave (SAW) propagating substrate are called SAW streaming. In this paper, the liquid dynamic motions excited by the SAW fabricated on 128° rot. Y-X LiNb03 at the frequency of 50 MHz with various pulse widths are demonstrated. The SAW streaming system are also tested for use as a micropump. Theoretically, SAW streaming force can be derived based on the acoustic streaming theory. The calculated SAW streaming force is found to be very large and strong enough to expel a droplet from a liquid surface.Nonlinear behavior in a water drop vibration induced by the SAW streaming force is also experimentally investigated as a model of inverse bubble oscillation. We succeed in detecting the transformation of the water drop vibration with a single pulse frequency spectrum to 1/2 and its harmonics.

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