Novel device to measure critical point ¡°Onset?of capillary wave and interpretation of Faraday instability wave by numerical analysis

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• 作者：Yu Lin  ; Song^a ;   ; ^b ; Chih Hsiao  ; Cheng^a ; Luh-Maan  ; Chang^b ; Chia-Fone  ; Lee^c ;   ; ^d ;   ; ^{e430013@yahoo.com.tw} ; Yuan Fang  ; Chou^a ;   ; ^{yfchou@ntu.edu.tw}
• 关键词：Capillary wave ; Onset state ; Faraday instability wave and atomization
• 刊名：Ultrasonics
• 出版年：2012
• 出版时间：January 2012
• 年：2012
• 卷：52
• 期：1
• 页码：54-61
• 全文大小：1678 K

文摘

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 ¦Ìm at f = 500 kHz. The critical amplitude h_cr was determined by using a multi-Fourier horn nozzle (MFHN) device. The onset point was measured to be 0.37 ¦Ìm using a laser Doppler vibrometer (LDV) with the MFHN at f = 486 kHz. These drops indicate that particle size distributions of 10.8 ¦Ìm and 7.0 ¦Ìm 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 = 0.34¦Ë.