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A Technique to Determine the Emissivity with the Temperature of a Fe-5.8 Pct Al-22 Pct Cr Alloy

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Abstract

High-chromium containing single-phase ferritic alloy surfaces are commonly used in high-temperature radiant heating applications. The surface emissivity number at any given temperature determines the rate of conversion from internal to radiant energy. In this article, using experimental data and numerical simulations, we have determined the emissivity of a Fe-5.8 pct Al-22 pct Cr alloy surface, as a function of temperature. Experimentally measured temperature values were compared with results from numerical simulations in order to accurately determine the surface emissivity. In the temperature range of 1200 to 1350 K, the emissivity was noted to increase with temperature.

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Notes

  1. The molybdenum disilicide material chosen is manufactured by MHI Inc. and sold under the tradename of MP1800. The pin-holes were specially introduced by the manufacturer for this test.

  2. INCONEL is a trademark of INCO Alloys International, Huntington, WV.

Abbreviations

F :

radiation shape factor between the surface and another surface i

g :

gravitational acceleration

I :

unit tensor

k :

thermal conductivity (W/m K)

p :

pressure (N/m2)

q ‴ :

volumetric heat dissipation rate (W/m3)

R :

gas constant for air

t :

transpose

T :

temperature (K)

V :

velocity (m/s)

α :

thermal diffusivity (m2/s)

ε :

surface emissivity

μ :

viscosity (kg/m s)

ρ :

density (kg/m3)

σ :

Stephan–Boltzmann constant

air :

air

solid :

all solid parts

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This material is based upon the work supported by MHI Inc. and NSF. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the funding sources for the research.

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Authors and Affiliations

  1. Department of Mechanical, Industrial, and Nuclear Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA

    K.N. Bhagat (Research Assistant) & M.A. Jog (Associate Professor)

  2. Department of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA

    V.K. Vasudevan & J.A. Sekhar (Professors)

  3. MHI Inc, Cincinnati, OH, 45215, USA

    G.S. Reddy (Scientist)

  4. Krieger GmbH & Co, 41238, Monchengladbach, Germany

    R. Aust (Technical Director)

Authors
  1. K.N. Bhagat
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  2. G.S. Reddy
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  3. M.A. Jog
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  4. R. Aust
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  5. V.K. Vasudevan
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  6. J.A. Sekhar
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Corresponding author

Correspondence to M.A. Jog.

Additional information

Manuscript submitted February 4, 2007.

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Bhagat, K., Reddy, G., Jog, M. et al. A Technique to Determine the Emissivity with the Temperature of a Fe-5.8 Pct Al-22 Pct Cr Alloy. Metall Mater Trans B 38, 725–728 (2007). https://doi.org/10.1007/s11663-007-9072-z

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  • DOI: https://doi.org/10.1007/s11663-007-9072-z

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