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RESEARCH PAPERS

Laser-Induced Thermophoresis and Particulate Deposition Efficiency

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

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

J. W. Cipolla

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

J. Heat Transfer 107(1), 155-160 (Feb 01, 1985) (6 pages) doi:10.1115/1.3247372 History: Received May 05, 1983; Online October 20, 2009

Abstract

The interaction of laser radiation and an absorbing aerosol in a tube flow has been considered. The aerosol is produced by external heating of reactants as in the MCVD (Modified Chemical Vapor Deposition) process to produce submicron size particles in the manufacture of optical fiber preforms. These particles are deposited by thermophoretic forces on the inner wall of the tube as they are convected by a Poiseuille velocity profile. Axial laser radiation in the tube interacts with the absorbing particles, and the laser heating of the gas induces additional thermophoretic forces that markedly increase the efficiency of particulate deposition. A particle concentration dependent absorption coefficient that appears in the energy equation couples the energy equation to the equation of particle conservation, so that a nonlinear set of coupled partial integro-differential equations must be solved. Numerical solutions for aerosol particle trajectories, and thus deposition efficiencies, have been obtained. It is shown that laser enhanced thermophoresis markedly improves the deposition efficiency.

Copyright © 1985 by ASME
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