# Bejan Number - Heat Transfer

Bejan number - heat transfer, abbreviated as Be, a dimensionless number, is the pressure drop along a channel of length.

## Bejan Number - Heat Transfer formula

\(\large{ Be = \frac{ \Delta p \; l^2 }{ \mu \; \alpha } }\) |

### Where:

\(\large{ Be }\) = Bejan number

\(\large{ l }\) = channel of length

\(\large{ \mu }\) (Greek symbol mu) = dynamic viscosity

\(\large{ \Delta p }\) = pressure drop

\(\large{ \alpha }\) (Greek symbol alpha) = thermal diffusivity (heat transfer rate)