Document Type

Article

Publication/Presentation Date

11-2006

Abstract/Description

Explosive boiling and lift-off of a thin layer of micron-sized transparent water droplets from an absorbing Si substrate heated by a nanosecond KrF laser were studied using a contact photoacoustic technique. The compressive photoacoustic response increases steeply to an asymptotic value on the order of the water critical pressure starting at a threshold laser fluence of 0.20 J cm2, where lift-off of the water layer also occurs. Above this threshold, several reproducible discrete multimegahertz components are revealed in Fourier spectra of the acoustic transients, corresponding to nanosecond oscillations of steam bubbles inside the water droplets on the microsecond time scale of the lift-off process. The acoustic pressure buildup, bubble dynamics, and the subsequent lift-off of the thin water layer are interpreted as relaxation stages after near-spinodal explosive boiling of the superheated interfacial water. © 2006 American Institute of Physics.

Publication Title

Journal of Applied Physics

DOI

https://doi.org/10.1063/1.2372317

Publisher

American Institute of Physics

Additional Information

Dr. Susan Allen was not affiliated with Embry-Riddle Aeronautical University at the time this document was published.

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