Abstract
The fast boiling dynamics of superheated surface layers of bulk water cavitating under near-spinodal conditions during nanosecond C O2 laser heating pulses was studied using contact broad-band photoacoustic spectroscopy. Characteristic pressure-tension cycles recorded by an acoustic transducer at different incident laser fluences represent (a) weak random oscillations of transient nanometer-sized near-critical bubbles-precursors and (b) well-defined stimulated oscillations of micron-sized supercritical bubbles and their submicrosecond coalescence products. These findings provide an important insight into basic thermodynamic parameters, spatial and temporal scales of bubble nucleation during explosive liquid/vapor transformations in absorbing liquids ablated by short laser pulses in the thermal confinement regime.
© 2007 The American Physical Society.
| Original language | American English |
|---|---|
| Journal | Physical Review E |
| Volume | 75 |
| DOIs | |
| State | Published - Mar 1 2007 |
| Externally published | Yes |
Keywords
- acoustic transducer
- bulk water
- pulsed CO2 laser
- supercritical bubbles
- bubbles (in fluids)
- coalescence
- heating
- laser pulses
- nanotechnology
- photoacoustic spectroscopy
- water
- boiling liquids
Disciplines
- Mechanical Engineering