Peclet Number Calculator

Enter value and click on calculate. Result will be displayed.

Select calculator :

Velocity (v) :

m/s

Density (p) :

kg/m³

Heat Capacity (C_p) :

J/kg-K

Characteristic Length (D) :

Thermal Conductivity (k) :

W/m-K

Peclet Number (Pe) :

Result:

What is a Péclet Number Calculator?

A Péclet Number Calculator computes the Péclet number (Pe), which quantifies the relative importance of advection (bulk transport) to diffusion in fluid flow and heat/mass transfer.

Why Use a Péclet Number Calculator?

To analyze transport phenomena in fluid mechanics, heat transfer, and mass transfer.
To determine if a system is diffusion-dominated or advection-dominated.
To optimize engineering designs (e.g., heat exchangers, reactors, pipelines).

How to Calculate the Péclet Number?

The formula is:

Where:

v = Flow velocity (m/s)
L = Characteristic length (m)
D = Diffusivity (m²/s)

Steps:

Measure or obtain values for velocity, length, and diffusivity.
Substitute them into the equation to compute PePe Pe.

When to Use It?

In fluid dynamics (e.g., studying river flows, pipe flows).
In heat transfer (e.g., cooling systems, heat exchangers).
In chemical engineering (e.g., mixing and reaction processes).