A free convection flow is one produced by buoyancy force. In free convection, the fluid would be at rest in the absence of temperature variations. For free convective flows to be dynamically similar, the Grashof number
where g is the gravitational acceleration, is the thermal expansion coefficient, is the temperature difference, L is the length scale, and is the kinematic viscosity, and Prandtl number
and is the thermal diffusivity must be the same in both systems.
For
Convection, Forced Convection, Grashof Number, Prandtl Number, Rayleigh Number
