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Novel device to measure critical point "Onset" of capillary wave and interpretation of Faraday instability wave by numerical analysis |
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| Authors: | Song Yu Lin Cheng Chih Hsiao Chang Luh-Maan Lee Chia-Fone Chou Yuan Fang |
| Institution: | a Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan b High Technology Research Center, Yen Tjing Ling Industrial Research Institute, Taiwan c Department of Otolaryngology, Tzu Chi General Hospital, Hualien, Taiwan d Department of Medicine, Tzu Chi University, Hualien, Taiwan |
| Abstract: | A capillary wave was created on a surface by vibrating from the bottom of a container. When the amplitude of the container vibration approached the critical point, called the onset state, the surface broke up and bursted into very small drops on the air. The numerical analysis was used to determine the amplitude of the onset. The onset point was found to be 0.349 μm at f = 500 kHz. The critical amplitude hcr was determined by using a multi-Fourier horn nozzle (MFHN) device. The onset point was measured to be 0.37 μm using a laser Doppler vibrometer (LDV) with the MFHN at f = 486 kHz. These drops indicate that particle size distributions of 10.8 μm and 7.0 μm were produced by the MFHN at f = 289 kHz and f = 486 kHz, respectively. These results agreed with those obtained using Kelvin’s equation, which predicted D = 0.34λ. |
| Keywords: | Capillary wave Onset state Faraday instability wave and atomization |
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