Experimental values of the monochromatic, near normal emittance, ελN, of gold at cryogenic temperatures are presented and compared with values predicted by existing theoretical models. From this comparison recommendations are made regarding the engineering suitability of these models. Data obtained by the present authors for ελN of gold in the wavelength range 1 to 30μ and at temperatures of 300, 79, and 6.0 K are compared with the Drude free electron model, the anomalous skin effect theory for both specular and diffuse electron reflections, and the Holstein quantum mechanical model. Results show that the anomalous skin effect model with diffuse electron reflections predicts ελN most accurately. At room temperature and at liquid nitrogen temperature the agreement between this model and the data is within 5 percent. At liquid helium temperatures the agreement is somewhat poorer, i.e., within 30 percent.
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Research Papers
Thermal Radiative Properties of the Noble Metals at Cryogenic Temperatures
W. M. Toscano,
W. M. Toscano
CTi—Cryogenics, Waltham, Mass.
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E. G. Cravalho
E. G. Cravalho
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass.
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W. M. Toscano
CTi—Cryogenics, Waltham, Mass.
E. G. Cravalho
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass.
J. Heat Transfer. Aug 1976, 98(3): 438-445 (8 pages)
Published Online: August 1, 1976
Article history
Received:
January 7, 1976
Online:
August 11, 2010
Citation
Toscano, W. M., and Cravalho, E. G. (August 1, 1976). "Thermal Radiative Properties of the Noble Metals at Cryogenic Temperatures." ASME. J. Heat Transfer. August 1976; 98(3): 438–445. https://doi.org/10.1115/1.3450573
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