A new dynamic technique for the measurement of hemispherical total emittance

1992 ◽  
Vol 13 (1) ◽  
pp. 17-27 ◽  
Author(s):  
F. Righini ◽  
G. C. Bussolino ◽  
A. Rosso
Keyword(s):  
Dynamic Technique ◽  
Hemispherical Total Emittance ◽  
Total Emittance

A Dynamic Technique for Measurements of Thermophysical Properties at High Temperatures

1981 ◽  
Vol 9 ◽  
Author(s):  
Ared Cezairliyan
Keyword(s):  
Melting Temperature ◽  
Thermophysical Properties ◽  
Solid Phase ◽  
Electrical Current ◽  
Heat Of Fusion ◽  
Electrically Conducting ◽  
Current Voltage ◽  
Dynamic Experiments ◽  
Hemispherical Total Emittance ◽  
Total Emittance

ABSTRACTA technique is described for the dynamic measurements of selected thermophysical properties of electrically conducting substances in the range 1500 K to the melting temperature of the specimen. The technique is based on rapid resistive self-heating of the specimen from room temperature to any desired high temperature in less than one second by the passage of an electrical current pulse through it and on measuring the pertinent quantities, such as current, voltage and temperature, with millisecond resolution. The technique was applied to the measurements of heat capacity, electrical resistivity, hemispherical total emittance, normal spectral emittance, thermal expansion, melting temperature, heat of fusion, and temperature and energy of solid-solid phase transformations. Upper temperature of the measurements has been limited by the melting temperature of the specimen, at which point, the specimen collapses due to the gravitational force. In order to be able to extend the measurements to the liquid phase, performance of the dynamic experiments in a near-zero gravity environment is suggested.

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