title: Novel device to measure critical point "Onset" of capillary wave and interpretation of Faraday instability wave by numerical analysis.
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 0.349μm at f=500kHz. The critical amplitude h(cr) was determined by using a multi-Fourier horn nozzle (MFHN) device. The onset point was measured to be 0.37μm using a laser Doppler vibrometer (LDV) with the MFHN at f=486kHz. These drops indicate that particle size distributions of 10.8μm and 7.0μm were produced by the MFHN at f=289kHz and f=486kHz, respectively. These results agreed with those obtained using Kelvin's equation, which predicted D=0.34λ.
authors.affiliation: Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan.
authors.forename: Yu Lin
authors.initials: YL
authors.lastname: Song
authors.forename: Chih Hsiao
authors.initials: CH
authors.lastname: Cheng
authors.forename: Luh-Maan
authors.initials: LM
authors.lastname: Chang
authors.forename: Chia-Fone
authors.initials: CF
authors.lastname: Lee
authors.forename: Yuan Fang
authors.initials: YF
authors.lastname: Chou
mesh_terms: D000280:Administration, Inhalation; D000336:Aerosols; D000465:Algorithms; D016503:Drug Delivery Systems; D004867:Equipment Design; D005583:Fourier Analysis; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation*; D014732:Vibration
chemical_list: D000336:Aerosols