64. Effect of Scattering on the Combined Reflection and Thermal Radiation Emission of a Typical Semitransparent TBC Material

  1. Edgar Lara-Curzio and
  2. Michael J. Readey
  1. Charles M. Spuckler

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291191.ch64

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4

How to Cite

Spuckler, C. M. (2008) Effect of Scattering on the Combined Reflection and Thermal Radiation Emission of a Typical Semitransparent TBC Material, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch64

Author Information

  1. NASA Glenn Research Center 21000 Brookpark Rd. Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2004

ISBN Information

Print ISBN: 9780470051528

Online ISBN: 9780470291191

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Keywords:

  • hafnium carbide;
  • energy dispersive spectrometry;
  • space solar power system;
  • oxygen;
  • thermal receiver

Summary

A parametric study was undertaken to examine the effects of scattering on the combined reflection and thermal radiation emission of a typical semitransparent thermal barrier coating material. Some ceramic materials are semitransparent in the wavelength ranges where thermal radiation is important. Therefore, absorption, emission, and scattering of thermal radiation by the layer will affect the heat transfer and temperatures profile. The total radiation leaving one side of the layer is the external radiation reflected back by the interface, radiation emitted internally by the layer and transmitted through the interface, radiation scattered by sites inside the layer and transmitted through the interface, and radiation transmitted through the layer from the surroundings on the opposite side. Total internal reflection of scattered and internally emitted radiation affects the radiation leaving the layer and the temperature profile. A one dimensional model of a semitransparent layer heated on one side and cooled on the other by convection and radiation is used. The coating is assumed to be gray (absorption and scattering coefficients are not function of wavelength). The absorption coefficient, scattering coefficient, and convective heat transfer coefficients are varied. The total radiation leaving the layer in each direction is presented as a function of scattering for a range of absorption coefficients. Temperature profiles inside the layer are presented showing the effect of scattering and absorption.