Reynolds Number:

It is the ratio of inertia forces to viscous forces in the velocity boundary layer. It is used in forced convection and approximated as:

Re=$\frac{(Inertia forces)}{(Viscous forces)}$=$\frac{(ρu_∞ L_c)}{μ}$=$\frac{(u_∞ L_c)}{v}$

Where u is the upstream velocity (equivalent to the free-stream velocity $u_∞$ for a flat plate), Lcis the characteristic …