In 1020 steel, the only significant element other than iron and carbon is _________.
Fill in the blank(s) with the appropriate word(s).
manganese
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A spherical vessel 0.3-m in diameter is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.
GIVEN
• A black spherical vessel of liquid oxygen in a large black room
• Liquid oxygen temperature (To) = –183°C = 90 K
• Sphere diameter (D) = 0.3 m
• Room wall temperature (Tw) = 27°C = 300 K
FIND
• The rate of radiative heat transfer to the liquid oxygen in W and Btu/h
ASSUMPTIONS
• Steady state prevails
• The temperature of the vessel wall is the same as the temperature of the oxygen
SKETCH
PROPERTIES AND CONSTANTS
The Stefan-Boltzmann constant (?) = 5.67 ? 10–8 W/(m2 K4)
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