Laser induced natural convection and thermophoresis

Conference · Fri Jul 01 04:00:00 EDT 1983 · HTD (Publ.) (Am. Soc. Mech. Eng.); (United States)

OSTI ID:5236747

Wang, C Y; Cipolla, J; Morse, T F

The influence of axial laser volumetric heating and forced convection on the motion of aerosol particles in a vertical tube has been studied. The asymptotic case of constant wall temperature provides simple temperature and velocity profiles that determine the convection and thermophoretic motion of small aerosol particles. For the case in which the flow (in the absence of laser heating) is downward, the laser heating induces upward buoyant motion near the tube center. When the laser heating is taken to be constant (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.

• Research Organization: Brown University, Providence, Rhode Island
• OSTI ID: 5236747
• Report Number(s): CONF-830702-
• Conference Information: Journal Name: HTD (Publ.) (Am. Soc. Mech. Eng.); (United States) Journal Volume: HTD-VOL.23
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
ABSORPTION
AEROSOLS
BOUNDARY CONDITIONS
CHEMICAL ANALYSIS
COLLOIDS
CONVECTION
DEPOSITION
DISPERSIONS
DISTANCE
FIBERS
FORCED CONVECTION
HEATING
LASER-RADIATION HEATING
MOTION
OPTICAL FIBERS
PARTICLES
PARTICULATES
PLASMA HEATING
QUANTITATIVE CHEMICAL ANALYSIS
SOLS
TEMPERATURE DEPENDENCE
THERMOPHORESIS
TUBES
VELOCITY
VOLUMETRIC ANALYSIS
WALLS