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RESEARCH PAPERS: Radiative Heat Transfer

Spectral-Directional Emittance of CuO at High Temperatures

[+] Author and Article Information
Peter D. Jones1

Department of Mechanical Engineering, Auburn University, Auburn, Alabama 36849pjones@eng.auburn.edu

George Teodorescu, Ruel A. Overfelt

Department of Mechanical Engineering, Auburn University, Auburn, Alabama 36849

1

Corresponding author.

J. Heat Transfer 128(4), 382-388 (Oct 24, 2005) (7 pages) doi:10.1115/1.2165207 History: Received March 31, 2005; Revised October 24, 2005

Spectral-directional emittance measurements for cupric oxide (CuO) are presented. The data cover polar angles of 084deg from the surface normal, wavelengths between 1.5 and 8μm, and temperatures between 400 and 700°C. The data were generated using a radiometric, direct emission measurement method. The oxide was grown on a very clean, smooth, and mirror-like copper surface, heated in air at 700°C until emission measurements became constant (270h). X-ray diffraction and EDS analyses were performed to characterize the spatial and molecular composition of the copper oxide layer. It is generally found that CuO emittance decreases with increasing polar angle, increases with increasing wavelength, and increases with increasing temperature. Spectral-directional emittance values calculated from the Fresnel relations show good agreement with the measurements up to polar angles of 72deg.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Pressure-temperature diagram for the system copper-oxygen (6). Reprinted with permission from Journal of Applied Physics, 69 (2), p. 1021 (1991). Copyright 2006, American Institute of Physics.

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Figure 2

Experimental setup

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Figure 3

Micrograph of copper oxide removed from copper substrate

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Figure 4

Optical thickness of CuO versus wavelength

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Figure 5

Spectral-directional emittance of CuO at 700°C

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Figure 6

Spectral real part of the refractive index at considered temperatures

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Figure 7

Spectral imaginary part of the refractive index at considered temperatures

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Figure 8

Spectral normal emittance of CuO as a function of wavelength

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Figure 9

Spectral-directional emittance of CuO at 700°C from present work and oxidized copper at 697°C from Ref. 5

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Figure 10

Spectral-directional emittance of CuO from present work and from electromagnetic theory for 3.5 and 7.5μm

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