Momentum diffusivity is kinematic viscosity $\nu=\mu/\rho$, while thermal diffusivity is $\alpha=k/(\rho c_p)$. Their ratio is $\nu/\alpha=\mu c_p/k$, the Prandtl number. Reynolds and Peclet compare convection to diffusion; Nusselt compares convective and conductive heat transfer. Select B.
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