Transient conductive and radiative heat transfer in a silica window

A detailed thermal analysis for transient conduction and nongray radiation of glass subjected to high levels of convection is discussed. Only a small variation of results due to the best available refractive index data was found. A peak value that does not coincide with the peak temperature was created by the radiation heat flux. This effect in turn produced a hump in the results for dimensional conduction heat flux, but has little effect on the temperature distribution. However, the highest temperature always occurred at the first boundary, which allows the prediction of the onset of softening and subsequent distortion optics. 5 refs.