Turbulent Prandtl number
= Turbulent Prandtl number
{title2=$\mathrm{Pr}_t=K_m/K_b$}
The ratio of turbulent momentum diffusivity to buoyancy or heat diffusivity. Their ratio determines how the <gradient Richardson number> is related to the energy-budget <Flux Richardson number>. It is generally a closure-dependent function of the flow, not necessarily one.