A molten aluminum alloy at 900 K is poured into a cylindrical container that is well insulated from large surroundings at 300 K. The inner diameter of the container is 250 mm, and the distance from the surface of the melt to the top of the container is 100 mm. If the oxidized aluminum at the surface of the melt has an emissivity of 0.55, what is the net rate of radiation heat transfer from the melt?

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T- 300 K Molten metal T- 900 K. E- 055 L = 100 mm D= 250 mm