# Peclet number

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

The Peclet number is defined as

$Pe \equiv \frac{U_\infty L}{\alpha}$

Also Pe \equiv Re Pr

where

• $U_\infty$ is the freestream velocity
• $L$ is the Characteristic Dimension of the problem
• $\alpha$ is the diffusion coefficient