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Sheet steel emerging from the hot roll section of a steel mill has a temperature of 120 K, a thickness of delta = 3mm, and the following distribution for the spectral, hemispherical emissivity.
Density = 7900 kg/m^3
Cp = 640 J/kg*K
Find:
What is total, hemispherical emissivity?
Determine the initial time rate of change of the sheet metal temperature (dT/dt)
if E = E1200[1200 K/T (K)], how long will it take for the steel to cool from 1200 to 600 K?
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