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International Heat Transfer Conference 10

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

OPTICAL AND ACOUSTIC STUDY OF THE RAPID VAPORIZATION OF LIQUIDS ON A SOLID SURFACE INDUCED BY PULSED ULTRAVIOLET LASER IRRADIATION

H. K. Park
Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA

Costas Grigoropoulos
Laser Thermal Laboratory, Department of Mechanical Engineering, University of California at Berkeley, 6129 Etcheverry Hall, Berkeley California 94720-1740, USA

O. Yavas
IBM Almaden Research Center, San Jose, USA

C. Poon
IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120-6099, USA

A.C. Tam
IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120-6099, USA

DOI: 10.1615/IHTC10.1700
pages 115-120

Abstract

The dynamics of the explosive vaporization of various liquids on a solid surface at the nanosecond time-scale are studied experimentally. Pure water, methanol, isopropanol (IPA) are in contact with a solid chromium surface that is heated by ultraviolet (UV) KrF excimer laser pulses of nanosecond duration. The laser fluence threshold for vaporization and the transient development of the bubble nucleation process are monitored by optical reflectance and scattering measurements. The onset of phase change is marked by a strong acoustic signal that is detected by a piezoelectric transducer. In addition, it is observed that the thermally driven phase change generates pressure waves in the liquid that trigger subsequent acoustic cavitation.

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