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You may receive a warning that says "The initial time increment may be too large for this problem. Check results carefully." . Our initial time step is set to 36seconds, which is rather large for transient analysis. The warning can be eliminated by turning off Auto Time Stepping under Analysis Settings and manually specify the initial time step.

By the end of end step time, 3600 seconds, The shell temperature dropped to around 19 degrees and the specimen temperature rose to around -126 degrees.

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We will now examine the radiation heat transfer between the surface of the shell and the specimen. Click on Radiation shell under the solution tree and expand the Tabular Data, located in the lower right corner.

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The three radiation terms on the right hand side of the equation represent different types of radiation associated with a given surface.
The first term is the emitted radiation.
The second term is the reflected radiation.
The third therm is the incident radiation.
The sum of these three terms gives the net radiation heat flux of a surface.

Tabular data of the shell

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