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Knudsen Number Calculator

The Knudsen Number refers to the dimensionless number. The Knudsen Number is defined as the ratio of the molecular mean free path length to a representative physical length scale. In short, the Knudsen Number refers to the ratio of the mean free path length of the molecules of a fluid to a characteristic length. It is used to describe the flow of low-density gases.

Knudsen Number Calculator

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Table of Contents:

    Formula

    Knudsen Number :
    Kn = λ/L

    Mean Free Path :
    λ = Kn*L

    Representative Physical Length Scale :
    L = λ/ Kn

    Where,
    Kn = Knudsen Number,
    λ = Mean Free Path,
    L = Representative Physical Length Scale.

    This Advanced Online Knudsen Number Calculator is used to calculate the ratio of the mean free path length of the molecules of a fluid to a characteristic length.

    Example:
    Calculate the Knudsen Number for the given details.
    Mean Free Path (λ) = 25 m
    Representative Physical Length Scale (L) = 20 m

    Solution:
    Apply Formula:
    Kn = λ/L
    Kn = 25/20
    Kn = 1.25