This study presents the hemispherical model to predict the hemispherical total thermal radiative properties of a fiber coated with a thin film. The fiber is composed of semi-transparent media, such as fused silica. The film is made of strong absorbing media with thickness on the order of tens of nanometers. The film is assumed to be “locally flat” at the point of incidence for radiative transfer analysis because the thickness of the film is much less than the fiber radius. Wave optics is employed to calculate the reflectance and transmittance of the thin film while the ray tracing method is used for radiative transport analysis of the fiber. Effects of film and fiber substrate optical properties, film thickness and temperature on predicted thermal radiative properties are investigated. One of the applications of the proposed model is for studying the chemical vapor deposition of hermetic coatings on optical fibers, in which the thermal radiative properties of the fiber–film system heavily influence the fiber surface temperature and chemical reaction rate.
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Thermal Radiative Properties of a Semitransparent Fiber Coated With a Thin Absorbing Film
Weixue Tian,
Weixue Tian
Department of Mechanical Engineering,
University of Connecticut
, Storrs, CT 06269-3139
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Wei Huang,
Wei Huang
Department of Mechanical Engineering,
University of Connecticut
, Storrs, CT 06269-3139
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Wilson K. S. Chiu
Wilson K. S. Chiu
Department of Mechanical Engineering,
e-mail: wchiu@engr.uconn.edu
University of Connecticut
, Storrs, CT 06269-3139
Search for other works by this author on:
Weixue Tian
Department of Mechanical Engineering,
University of Connecticut
, Storrs, CT 06269-3139
Wei Huang
Department of Mechanical Engineering,
University of Connecticut
, Storrs, CT 06269-3139
Wilson K. S. Chiu
Department of Mechanical Engineering,
University of Connecticut
, Storrs, CT 06269-3139e-mail: wchiu@engr.uconn.edu
J. Heat Transfer. Jun 2007, 129(6): 763-767 (5 pages)
Published Online: August 2, 2006
Article history
Received:
July 5, 2005
Revised:
August 2, 2006
Citation
Tian, W., Huang, W., and Chiu, W. K. S. (August 2, 2006). "Thermal Radiative Properties of a Semitransparent Fiber Coated With a Thin Absorbing Film." ASME. J. Heat Transfer. June 2007; 129(6): 763–767. https://doi.org/10.1115/1.2717247
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