Discussion
Fourier number may be expressed as :
Answer: C
Fourier number is the ratio of heat conduction rate to the rate of thermal energy storage in the solid.
The Fourier number, \(Fo = \frac{\alpha t}{L^{2}}\), appears in transient conduction. It compares how fast heat is conducted through a body with how fast the body stores it, and works as a dimensionless time: a large Fourier number means the heat has had time to penetrate deep into the solid.
The ratio of internal conduction resistance to surface resistance is the Biot number. Buoyancy over viscous force is the Grashof number, and gravitational over surface tension forces is the Bond number. All three appear as options to mislead.
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