An investigation into the phenomenon of acoustic streaming driven by surface wave
Date Issued
2008
Date
2008
Author(s)
Chang, Tseng-Yu
Abstract
Propagation of SAW（surface acoustic waves）on a solid-liquid interface has been known and studied for a long time because of its broad varieties of applications. The SAW phenomenon was found by Rayleigh from studies in surface wave propagation of earthquake in 1885. Since then, the SAW has been studied in many different research areas. In this dissertation, we investigate the phenomenon of acoustic streaming driven by a SAW device. The device is made on 4-inches 127.86°Y-X cut LiNbO3 piezoelectric wafer. An IDT is patterned on the surface of the wafer to excite the Rayleigh waves. The device is driven by a sine-wave generator at 9.7MHz. A liquid container filled with water at a depth of 14cm is constructed on the wafer. When the device is driven at the aforementioned condition, acoustic streaming is observed. The flow field is recorded by a CCD camera and analyzed with PIV techniques. Velocity fields are measured. Velocity-time figures at 5 different observation positions in the fluid field are plotted. Directivity of the streaming jet agrees well with the theoretical prediction.
Subjects
Rayleigh wave
acoustic streaming jet
Mach angle
IDT
piezoelectric SAW
PIV
Type
thesis
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