Richardson Number Formula

Equation for calculate richardson number is,

$$\mathrm{Ri}=\frac{\mathrm{g\; ·\; \beta \; ·\; (T_hot\; -\; T_ref)\; ·\; L}}{\mathrm{V²}}$$

where,
β = thermal expansion coefficient
T_hot = hot wall temperature
T_ref = reference temperature
L = characteristic length
V = characteristic velocity
g = Standard gravity (9.80665 m/s²)