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magnitudes of the buoyancy force actin ater, (c) mercury, and (d) an evacuated an ideal gas is ß = 1/T, where T is the a

magnitudes of the buoyancy force actin ater, (c) mercury, and (d) an evacuated an ideal gas is ß = 1/T, where T is the a

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(a) What is natural convection? How does it differ from forced convection? What force causes natural convection currents? (b) What is buoyancy force? Compare the relative magnitudes of the buoyancy force acting on a body immersed in these mediums: (a) air, (b) water, (c) mercury, and (d) an evacuated chamber. (c) Show that the volume expansion coefficient of an ideal gas is ß = 1/T, where T is the absolute temperature. (d) How does the Rayleigh number differ from the Grashof number? (e) When is natural convection negligible and when is it not negligible in forced convection heat transfer?
Transcribed Image Text:(a) What is natural convection? How does it differ from forced convection? What force causes natural convection currents? (b) What is buoyancy force? Compare the relative magnitudes of the buoyancy force acting on a body immersed in these mediums: (a) air, (b) water, (c) mercury, and (d) an evacuated chamber. (c) Show that the volume expansion coefficient of an ideal gas is ß = 1/T, where T is the absolute temperature. (d) How does the Rayleigh number differ from the Grashof number? (e) When is natural convection negligible and when is it not negligible in forced convection heat transfer?
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