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RESEARCH PAPERS

Laser-Induced Natural Convection and Thermophoresis

[+] Author and Article Information
C. Y. Wang, T. F. Morse

Division of Engineering, Brown University, Providence, R.I.

J. W. Cipolla

Department of Mechanical Engineering, Northeastern University, Boston, Mass.

J. Heat Transfer 107(1), 161-167 (Feb 01, 1985) (7 pages) doi:10.1115/1.3247373 History: Received May 05, 1983; Online October 20, 2009

Abstract

The influence of axial laser volumetric heating and forced convection on the motion of aerosol particles in a vertical tube has been studied using the Boussinesq approximation. For constant wall temperature, an asymptotic case provides simple temperature and velocity profiles that determine the convection and thermophoretic motion of small aerosol particles. Laser heating induces upward buoyant motion near the tube center, and when forced convection is downward, there may be an inflection in the velocity profile. For constant laser heating (a small absorption limit), a velocity profile may be found that will minimize the distance over which particles are deposited on the wall. Such an observation may have some bearing on the manufacture of preforms from which optical fibers are drawn.

Copyright © 1985 by ASME
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