Nondimensionalize the energy equation
\rho c_p \left\lgroup u\frac{\partial T}{\partial x} +v\frac{\partial T}{\partial y} \right\rgroup =K\nabla^2 T
using a characteristic velocity U, length l, and temperature T_0. Express the dimensionless parameter that results in terms of the Prandtl number
Pr=\mu \frac{c_p}{K}
