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High-intensity light propagation and induced natural laminar flow

Published online by Cambridge University Press:  29 March 2006

Siegfried H. Lehnigk  and
Bernard Steverding
Siegfried H. Lehnigk
Affiliation:
Physical Sciences Directorate, U.S. Army Missile Research, Development and Engineering Laboratory, U.S. Army Missile Command, Redstone Arsenal, Alabama 35809
Bernard Steverding
Affiliation:
Physical Sciences Directorate, U.S. Army Missile Research, Development and Engineering Laboratory, U.S. Army Missile Command, Redstone Arsenal, Alabama 35809
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Abstract

The objective of this paper is to describe approximately the coupled steady-state processes of light propagation and induced laminar incompressible fluid flow in the case of natural convection.

For the case of a homogeneous fluid and under the assumptions that light energy is instantaneously transformed into heat and that the induced velocities are not too large, it is reasonable to use the boundary-layer equations to describe the induced natural flow. These equations are augmented by the conservation of energy equation. The velocity, temperature and intensity functions are expected to exhibit similarity properties.

A high-intensity light beam with a given rotationally symmetric Gaussian initial intensity distribution is propagating vertically upwards into a fluid initially at rest. The fluid characteristics are assumed to be constant. A stream function is introduced to satisfy the conservation of mass equation. The conservation of momentum equation leads to conditions on the unknown functions involved in the stream function. Additional conditions follow from the conservation of energy equation, which involves the local light intensity as a driving term.

Under the assumptions made, self-defocusing (thermal blooming) will occur. The main results are an exponential increase of the boundary-layer thickness and an exponential decrease of temperature and of light intensity due to the blooming effect in addition to the exponential decrease due to absorption.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 66 , Issue 4 , 11 December 1974 , pp. 817 - 829
Copyright
© 1974 Cambridge University Press

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