# Péclet number

From AMS Glossary

(Redirected from Peclet number)

## Péclet number

A nondimensional number arising in problems of heat transfer in fluids.

It is the ratio of heat advection to heat diffusion and may be written where the product of the Reynolds number and Prandtl number.

*U*is a characteristic velocity,*L*a characteristic length, and*K*the thermometric conductivity. Also,