FC_sphere_ND
The procedure FC_sphere_ND(Ra, Pr: Nusselt) returns the Nusselt number for a sphere (heated or cooled) immersed in a fluid, given a characteristic Rayleigh and Prandtl numbers. The Rayleigh number should be calculated based on the diameter, D.
Inputs:
Ra - Rayleigh number based on sphere diameter, D [-]
Pr - Prandtl number of fluid [-]
Outputs:
Nusselt - Nusselt number [-]
Notes:
The procedure FC_sphere_ND is called by the dimensional variant FC_sphere to determine the Nusselt number. The procedure FC_sphere_ND is based on the Churchill (1983) correlation as described in section 6.2.3 of Nellis and Klein. This correlation is valid for Pr>~0.7 and Ra<~1e11.
Example:
Ra=1.5e6
Pr=2.0
Call FC_sphere_ND(Ra, Pr: Nusselt)
{Solution: Nusselt=19.52}