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The Knudsen layer, also known as evaporation layer, is the thin layer of vapor near a liquid or solid. It is named after Danish physicist Martin Knudsen (1871–1949).

Definition

This region, several mean free path lengths thick, is called the Knudsen layer.

Knudsen layer thickness

The knudsen layer thickness can be approximated by $l_c$, given by

$l_c=\frac{k{T}_s}{\pi d^2{p}_s}$,

where $k$ is Boltzmann's constant, $T_s$ is the temperature, $d$ is the molecular diameter and $p_s$ is the pressure.

Applications

One of the applications of Knudsen layer is in the coma of comets. It has been used specially in the coma chemistry model (ComChem model).

References

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