Experimental and Theoretical Comparison of Radiation Conductivity Predicted by Steady‐State Theory With That Effective Under Periodic Temperature Conditions

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Abstract
The use of the steady‐state radiation conductivity, calculated from the high‐temperature absorption coefficients, to describe a periodic temperature change within a large volume of glass is investigated. Analysis shows that this steady‐state effective conductivity can be thus used, provided the amplitude and frequency of the temperature variation are small enough. These conditions are shown to have been fulfilled at the higher temperatures used in the experimental investigation. The general equations presented provide a basis for testing the assumption that the steady‐state radiation conductivity can be used to describe any transient temperature change.
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