Electrostrictive fluid pressure from a laser beam

Details Electrostrictive fluid pressure from a laser beam Electrostrictive fluid pressure from a laser beam

2011-08-23

arxiv.org/abs/1108.4510v1

Physics of Fluids 23, 096101 (2011)

Physics

Fluid Dynamics

10 pages, 7 figures. Accepted for publication in Physics of Fluids

Scientific paper

10.1063/1.3638130

Recent times have seen surge of research activity on systems combining fluid mechanics and electromagnetic fields. In radiation optics, whenever information about the distribution of pressure in a dielectric fluid is required, the contribution from electrostriction becomes important. In the present paper we calculate how the local pressure varies with position and time when a laser beam is imposed in a uniform fluid. A Gaussian intensity profile of arbitrary time dependence is assumed for the beam, and general results are derived in this case. For demonstration we analyze two different cases: first, that the beam is imposed suddenly (mathematically in the form of a step function); secondly, that the beam is switched on in a soft way. In both cases, simple analytical expressions for the pressure distribution are found.

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