Optical measurements of pressure transients in the rapid vaporization of liquids on a pulsed-laser-heated surface
- Univ. of California, Berkeley, CA (United States). Dept. of Mechanical Engineering
- IBM Almaden Research Center, San Jose, CA (United States)
The transient pressure generation upon rapid phase transition of liquids is studied. Liquids vaporize explosively on a solid surface that is heated by a KrF excimer laser of nanosecond pulse duration. First the physical mechanisms responsible for the pressure production are reviewed. Experiments are then performed to detect acoustic wave transients by an in-situ optical technique, the photoacoustic probe beam deflection method, as well as a piezoelectric transducer. The bubble growth kinetics is simultaneously probed by the optical specular reflectance technique. The experimental results show that bubble expansions in the superheated liquid radiate a compressional pressure wave packet of high intensity, of the order of 1 MPa.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 435670
- Report Number(s):
- CONF-951135--; ISBN 0-7918-1751-2
- Country of Publication:
- United States
- Language:
- English
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