VISUALISATION AND ANALYSIS OF LIQUID FILM SURFACE PATTERNS FORMED ON ULTRASONIC ATOMISERS
作者： M. Dobre , L. Bolle
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摘要: The ultrasonic atomisation mechanism involves the formation of regular waves on liquid surface which will breakup into droplets when resonance is reached. Spray characteristics are closely related to this wave structure developed just before atomisation. An experimental study has been undertaken in order measure free wavelength. results compared with values predicted by linear stability analysis. influence several parameters (liquid properties, frequency) wavelength analysed. Finally relationship between and spray mean droplet diameter investigated. NOTATION A a0 D10 f g h m N S Liquid film amplitude Atomiser tip vibration Number Ultrasonic frequency Gravity acceleration height mass Mean vp V Wep λ λs ρ σ μ ω Wave pattern velocity volume Weber number oscillation - measured calculated Density
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