g is Gravitational Acceleration (m/s2)
β is the Coefficient of Thermal expansion (1/K)
Ts is the Surface Temperature (oC)
T∞ is the Bulk Temperature (oC)
D is the Diameter (m)
ν is the Kinematic Velocity (m2/s)
Grashof Number for Bluff Bodies is a Dimensionless number, it is Define as Ratio of Buoyancy Force to a Viscous Force.