Radiation Heat Transfer Coefficient for a Gray Surface
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This Demonstration studies the relationship between the radiation heat transfer coefficient 
and the temperature 
at the surface of the object and the temperature 
of the surroundings (idealized as an isothermal enclosing surface that is much larger than the object).
Contributed by: Cibele V. Falkenberg (February 2016)
Open content licensed under CC BY-NC-SA
Snapshots
Details
The radiation heat transfer coefficient is given by 
, where 
is the Stefan–Boltzmann constant (
).
This Demonstration can be used to compare the value obtained for with the range of values for the convective heat transfer coefficient for air when subject to free and forced convection. Notice the importance of emissivity, which is dependent on the surface material.
Reference
[1] T. L. Bergman, A. S. Lavine, F. P. Incropera, and D. P. Dewitt, Fundamentals of Heat and Mass Transfer, 7th ed., Hoboken, NJ: Wiley, 2011.
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