The Dynamics of SAW Streaming and its Application to Fluid Devices

1994 ◽  
Vol 360 ◽  
Author(s):  
Showko Shiokawa ◽  
Yoshikazu Matsui

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.

2013 ◽  
Vol 339 ◽  
pp. 104-108
Author(s):  
Xiang Ting Fu ◽  
Yan Zha ◽  
An Liang Zhang

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.


Lab on a Chip ◽  
2018 ◽  
Vol 18 (23) ◽  
pp. 3645-3654 ◽  
Author(s):  
Chuyi Chen ◽  
Steven Peiran Zhang ◽  
Zhangming Mao ◽  
Nitesh Nama ◽  
Yuyang Gu ◽  
...  

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”.


2014 ◽  
Vol 1659 ◽  
pp. 27-33
Author(s):  
Jian Zhou ◽  
Xingli He ◽  
Wenbo Wang ◽  
Nana Hu ◽  
Hao Jin ◽  
...  

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.


2008 ◽  
Vol 93 (9) ◽  
pp. 094105 ◽  
Author(s):  
X. Y. Du ◽  
Y. Q. Fu ◽  
S. C. Tan ◽  
J. K. Luo ◽  
A. J. Flewitt ◽  
...  

1988 ◽  
Author(s):  
G D. Hickman ◽  
Y L. Hsu ◽  
M S. Lee ◽  
B S. Bourgeois ◽  
S T. Hsieh ◽  
...  

2014 ◽  
Vol 716-717 ◽  
pp. 1108-1110
Author(s):  
Yi Gui Li ◽  
Jun Feng Zhang

Droplet mobility actuated by surface acoustic wave (SAW) was demonstrated in this paper. On the surface of the LiNBO3substrate, pairs of copper inter-digital transducer (IDT) were fabricated to generate Rayleigh wave at different radio frequency (RF) voltages. The various droplet motions, such as mixing, flowing and atomization were analyzed by adjusting pulse frequency and input power. The experimental results demonstrated that the SAW could function as an atomizer when the input power was higher than 25W. Based on fundamental experiments, a novel driving curve for micro droplets under different driving power was obtained as well.


2014 ◽  
Vol 1070-1072 ◽  
pp. 1167-1170
Author(s):  
Liang Zou ◽  
Xiu Qun Zhang ◽  
Xin Hua Zhao ◽  
Chun Tian ◽  
Hui Duan

In order to study the electromagnetic interference on SAW (surface acoustic wave) wireless temperature measurement system of the corona discharge, the paper analyzes the characteristics of the frequency spectrum of corona discharge, models the corona discharge and studies its radiation characteristics by simulation on Matlab. Based on this, the experimental platforms of corona discharge is set up. The result of the experiment confirms that corona discharge causes electromagnetic interference to the system and the influence decreases as the distance between the sensor and discharge sources increase. Then the sensor should be kept a certain distance from the discharge sources.


2013 ◽  
Vol 336-338 ◽  
pp. 80-83
Author(s):  
Ai Liang Zhang ◽  
Xiang Ting Fu ◽  
Yan Zha

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.


Lab on a Chip ◽  
2017 ◽  
Vol 17 (12) ◽  
pp. 2104-2114 ◽  
Author(s):  
Florian Kiebert ◽  
Stefan Wege ◽  
Julian Massing ◽  
Jörg König ◽  
Christian Cierpka ◽  
...  

We present a quantitative 3D comparison between experimental measurements and numerical simulations of the acoustic streaming induced velocity field.


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