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Introduction to the Gas Laws
The Flow of Gases in Leaks
Viscous Flow
Types of Flow
Turbulent Flow
Laminar Flow
Calculation of an example
Viscosity of some gases
Conversion of helium leak rate at laminar flow to leak rates of other Gases
Molecular Flow
Conversion of helium leak rate to air leak rate
Conversion from weight leak rate to volume leak rate
Conversion of helium-leak rates at molecular flow to other gases
Transition flow
The Response Time
Example: Integral leak test on a heat-exchanger
The size of the leakrate signal after tn time constants in %
The Diffusion of Gases
Graham's Law of diffusion of Gases
Diffusion-Coefficients of some gases
Example: Diffusion of Search Gas in Air
Permeation
Helium Bombing Test
Helium Leak test on Heat Exchangers
Leak Detection and Measuring Methods
Leak Detection with Tracer Gas Methods
Leak Test with Laser Beam
Literature
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Graham's Law of diffusion of Gases
(D = Diffusion coefficient, M = relative molecular mass)
