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Title: Laser induced thermophoresis and particulate deposition efficiency

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 are subsequently 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 non-linear set of coupled partial integrodifferential 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.

Authors:
; ;
Publication Date:
Research Org.:
Northeastern University, Boston, Massachusetts
OSTI Identifier:
5236746
Report Number(s):
CONF-830702-
Journal ID: CODEN: ASMHD
Resource Type:
Conference
Journal Name:
HTD (Publ.) (Am. Soc. Mech. Eng.); (United States)
Additional Journal Information:
Journal Volume: HTD-VOL 23; Conference: 21. ASME/AIChE national heat transfer conference, Seattle, WA, USA, 24 Jul 1983
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; PARTICULATES; DEPOSITION; LASER-RADIATION HEATING; THERMOPHORESIS; ABSORPTION; AEROSOLS; EFFICIENCY; LAMINAR FLOW; MANUFACTURING; NONLINEAR PROBLEMS; NUMERICAL SOLUTION; OPTICAL FIBERS; PARTIAL DIFFERENTIAL EQUATIONS; PARTICLE SIZE; PARTICLE TRACKS; TRAJECTORIES; TUBES; VELOCITY; WALLS; COLLOIDS; DIFFERENTIAL EQUATIONS; DISPERSIONS; EQUATIONS; FIBERS; FLUID FLOW; HEATING; PARTICLES; PLASMA HEATING; SIZE; SOLS; 420400* - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Cipolla, J, Morse, T F, and Wang, C Y. Laser induced thermophoresis and particulate deposition efficiency. United States: N. p., 1983. Web.
Cipolla, J, Morse, T F, & Wang, C Y. Laser induced thermophoresis and particulate deposition efficiency. United States.
Cipolla, J, Morse, T F, and Wang, C Y. 1983. "Laser induced thermophoresis and particulate deposition efficiency". United States.
@article{osti_5236746,
title = {Laser induced thermophoresis and particulate deposition efficiency},
author = {Cipolla, J and Morse, T F and Wang, C Y},
abstractNote = {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 are subsequently 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 non-linear set of coupled partial integrodifferential 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.},
doi = {},
url = {https://www.osti.gov/biblio/5236746}, journal = {HTD (Publ.) (Am. Soc. Mech. Eng.); (United States)},
number = ,
volume = HTD-VOL 23,
place = {United States},
year = {Fri Jul 01 00:00:00 EDT 1983},
month = {Fri Jul 01 00:00:00 EDT 1983}
}

Conference:
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