For 10 points, name this dimensionless quantity, which represents the ratio of the buoyancy force to the viscous force acting on the fluid.
In wave mechanics it gives the ratio of the square of the dissipation time to the internal wave period. When this value greatly exceeds the square of the Reynolds number, forced convection effects are negligible. The product of this value and the (*) Prandtl number yields the Rayleigh number, and it governs the flow regime in natural convection. For 10 points, name this dimensionless quantity, which represents the ratio of the buoyancy force to the viscous force acting on the fluid.
In wave mechanics it gives the ratio of the square of the dissipation time to the internal wave period.
{Grashof} number