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TECHNICAL BRIEFS

Thermal Radiative Properties of a Semitransparent Fiber Coated With a Thin Absorbing Film

[+] Author and Article Information
Weixue Tian, Wei Huang

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139

Wilson K. S. Chiu1

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269-3139wchiu@engr.uconn.edu

1

Corresponding author.

J. Heat Transfer 129(6), 763-767 (Aug 02, 2006) (5 pages) doi:10.1115/1.2717247 History: Received July 05, 2005; Revised August 02, 2006

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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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of system geometry and coordinates for this study. To demonstrate the effect of thin film, drawing is not to scale. (a) Geometry and coordinates of the optical fiber-thin film structure; (b) Cross section view of the system, the incident wave is assumed to be aligned with the cross section.

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Figure 2

Effect of the nondimensional fiber optical thickness τR on emittance of fiber–film system

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Figure 3

Effect of real part of film refractive index on fiber–film emittance and film reflectance

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Figure 4

Effect of imaginary part of film refractive index on fiber–film emittance and film reflectance

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Figure 5

Effect of film thickness on the emittance of fiber–film system and transmittance of film

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Figure 6

Effect of temperature on emittance of a bare fiber and fiber–film system as well as reflectance of film

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