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2 Jan 2006

Volume 88, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 88, 011112 (2006); http://dx.doi.org/10.1063/1.2161387 (3 pages)

Yoshinori Tanaka, Takashi Asano, Ranko Hatsuta, and Susumu Noda
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Experimental analysis of multimode guided waves in stratified media

Laiyu Lu, Chenghao Wang, and Bixing Zhang

Appl. Phys. Lett. 88, 014101 (2006); http://dx.doi.org/10.1063/1.2159559 (3 pages) | Cited 2 times

Online Publication Date: 3 January 2006

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The dispersive characteristics of multimode guided waves in stratified media are studied experimentally. Ultrasonic surface detections are performed for two layered specimens: lucite/steel half-space and aluminum/lucite/steel half-space. Characteristics of the multimode dispersion curves are analyzed using the frequency-wave number method. The dispersion curves of two modes are obtained for the first specimen of a low-velocity layer on a fast substrate. The dispersion curves for the second specimen containing a low-velocity midlayer are discontinuous and correspond to different modes branches due to mode jumping. Further analysis demonstrates that the mode jumping is caused by the different surface displacement distribution with frequency for each mode. This indicates that the surface displacement distributions of the modes should be also accounted for in the inversion problems, especially in stratified media with a low-velocity midlayer.
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62.65.+k Acoustical properties of solids

Ultrasonic atomization using MHz silicon-based multiple-Fourier horn nozzles

Shirley C. Tsai, Yu L. Song, Chen S. Tsai, Yuan F. Chou, and Chih H. Cheng

Appl. Phys. Lett. 88, 014102 (2006); http://dx.doi.org/10.1063/1.2161398 (3 pages) | Cited 4 times

Online Publication Date: 4 January 2006

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Monodispersed droplets are produced in ultrasonic atomization using a microelectromechanical system-based three-Fourier horn 0.5 MHz silicon nozzle 3.66×0.38×0.11 cm3 in size. As water enters the 200 μm×200 μm central channel of the nozzle, a curved thin liquid film is maintained at the nozzle tip that vibrates at the resonance frequency of 486.5 kHz, resulting in the formation of standing capillary waves on the free film surface. Temporal instability of these standing capillary waves occurs as the tip vibration amplitude exceeds a threshold, and a spray of droplets (mist) is produced. The measured droplet diameter of 7.0 μm is in good agreement with the 6.7 μm diameter calculated by 0.34 times the capillary wavelength.
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47.85.Np Fluidics
47.55.db Drop and bubble formation
47.60.-i Flow phenomena in quasi-one-dimensional systems
47.35.Pq Capillary waves
43.35.-c
07.10.Cm Micromechanical devices and systems
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