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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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Viscous Flow

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At pressures above about 0.01 mbar the gas particles react more or less as fluids. The particles are very close to each other, so they collide more with each other than with the container walls. If they are pumped or if there is a pressure difference, they flow like a fluid.

There are two different kinds of viscous flow:
a.) Turbulent Flow and
b.) Laminar Flow.

 
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