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One of the characteristic numbers for processes of convective heat transfer. The Péclet number characterizes the relation between the convective and molecular heat-transport processes in a flow of liquid:
$$
\mathrm{Pe} = \frac{v l}{\alpha} = \frac{C_p \rho v}{\lambda/l}
$$
where $l$ is the characteristic linear scale of the heat-transfer surface, $v$ is the velocity of the liquid relative to that surface, $\alpha$ is thermal diffusion coefficient, $C_p$ is the heat capacity at constant pressure, $\rho$ is the density, and $\lambda$ is the thermal conductivity coefficient.

The Péclet number is related to the [[Reynolds number]] $\mathrm{Re}$ and the [[Prandtl number]] $\mathrm{Pr}$ by $\mathrm{Pe} = \mathrm{Re}\cdot\mathrm{Pr}$.

It is named after J. Péclet.

====References====
* J. M. Kay, R. M. Nedderman, "An Introduction to Fluid Mechanics and Heat Transfer", 3<sup>rd</sup> ed., Cambridge University Press (1974) {{ISBN|0-521-20533-6}} {{ZBL|0293.76001}}

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