Heat Transfer
The Fourier number (defined as a.t/L²) is used in the analysis of problem involving heat transfer by

Forced convection
Steady state conduction
Transient conduction
Natural convection

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Heat Transfer
Prandtl number is the ratio of

Thermal diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity
Momentum diffusivity to mass diffusivity
Thermal diffusivity to momentum diffusivity

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