Water expansion dynamics after pulsed IR laser heating

Physical Chemistry Chemical Physics : PCCP
Jonathan HobleyHiroshi Fukumura

Abstract

A nanosecond pulsed IR (1.9 microm) laser rapidly heated water, in an open vessel, to temperatures well below the boiling point. The subsequent dynamics of volume expansion were monitored using time-resolved interferometry in order to measure the increase in the water level in the heated area. The water expanded at less than the speed of sound, taking just less than 100 ns to increase its height by approximately 500 nm at surface temperature jumps of 20 K. The initial expansion was followed by an apparent contraction and then a re-expansion. The first expansion phase occurred more slowly than the timescale for bulk H-bond re-structuring of the water, as determined from vibrational bands in the Raman spectra, and represents the limit to the rate at which the overpressure caused by sudden heating can be released. The second phase of the expansion was caused by hydrodynamic effects and is accompanied by morphological changes resulting in light scattering as well as droplet spallation.

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Citations

May 15, 2009·Physical Chemistry Chemical Physics : PCCP·Nils HuseAaron M Lindenberg
Feb 4, 2010·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Shinji KajimotoHiroshi Fukumura
May 1, 2010·Physical Chemistry Chemical Physics : PCCP·Kresimir Franjic, Dwayne Miller
Apr 30, 2014·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Shinji KajimotoDana D Dlott
May 23, 2015·The Journal of Physical Chemistry. B·Pankaj Kr MishraRobin Santra
May 20, 2018·The Journal of Physical Chemistry. a·Pankaj Kr MishraRalph Welsch

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