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Mechanical Engineering QUESTION #2429
Question 1
The Fourier number (Fo) in transient conduction is defined as \(Fo = \alpha t / L_c^2\). It physically represents:
  • Dimensionless time of thermal diffusion: \(\frac{\alpha t}{L_c^2}\)✔️
  • Ratio of convective to conductive heat transfer
  • Ratio of buoyancy to viscous forces
  • Ratio of momentum diffusivity to thermal diffusivity
Correct Answer Explanation
The Fourier number \(Fo=\alpha t/L_c^2\) is dimensionless time measuring how far thermal diffusion has penetrated into the body relative to its characteristic dimension \(L_c\).