A study has been made of the deposition of particles that occurs during the modified chemical vapor deposition (MCVD) process. The three-dimensional conservation equations of mass, momentum, and energy have been solved numerically for forced flow, including the effects of buoyancy and variable properties in a heated, rotating tube. The motion of the particles that are formed is determined from the combined effects resulting from thermophoresis and the forced and secondary flows. The effects of torch speed, rotational speed, inlet flow rate, tube radius, and maximum surface temperature on deposition are studied. In a horizontal tube, buoyancy results in circumferentially nonuniform temperature and velocity fields and particle deposition. The effect of tube rotation greatly reduces the nonuniformity of particle deposition in the circumferential direction. The process is chemical-reaction limited at larger flow rates and particle-transport limited at smaller flow rates. The vertical tube geometry has also been studied because its symmetric configuration results in uniform particle deposition in the circumferential direction. The “upward” flow condition results in a large overall deposition efficiency, but this is also accompanied by a large “tapered entry length.”
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A Three-Dimensional Analysis of Particle Deposition for the Modified Chemical Vapor Deposition (MCVD) Process
Y. T. Lin,
Y. T. Lin
Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720
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M. Choi,
M. Choi
Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720
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R. Greif
R. Greif
Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720
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Y. T. Lin
Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720
M. Choi
Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720
R. Greif
Department of Mechanical Engineering, University of California at Berkeley, Berkeley, CA 94720
J. Heat Transfer. Aug 1992, 114(3): 735-742 (8 pages)
Published Online: August 1, 1992
Article history
Received:
February 1, 1991
Revised:
January 1, 1992
Online:
May 23, 2008
Citation
Lin, Y. T., Choi, M., and Greif, R. (August 1, 1992). "A Three-Dimensional Analysis of Particle Deposition for the Modified Chemical Vapor Deposition (MCVD) Process." ASME. J. Heat Transfer. August 1992; 114(3): 735–742. https://doi.org/10.1115/1.2911342
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