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Kinetic Theory and Thermophysical Properties

  1. Feb 26, 2005 #1

    Clausius2

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    Is there any way to derive the viscosity [tex]\mu[/tex] of an ideal gas from kinetic theory?

    Also: Is there any way to derive the mass diffusitivity [tex] D[/tex] of an ideal gas from kinetic theory?.

    Another one: does it make sense to talk about the mass diffusivity of an individual gas (for instance [tex] D_i[/tex]), or such magnitude is always referred to a gaseous mixture (i.e [tex] D_{ij}[/tex])?.

    Some web link of bibliography would be greatly appreciated.
     
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  3. Feb 26, 2005 #2

    Andrew Mason

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    Apparently there is. Viscosity of a gas is interesting. It is entirely different than viscosity of liquids. Seems Maxwell was the first to derive it from kinetic theory. See: http://www.math.umd.edu/~lvrmr/History/Foundations.html

    "In a gas, viscous force originates not in the forces between neighboring molecules but in the transfer of momentum that occurs when a molecule from a faster-moving stream wanders over to a slower-moving stream and collides with a molecule there. The rate of momentum transfer increases with the average molecular speed, so (1) the viscosity increases with temperature."

    AM
     
  4. Feb 26, 2005 #3

    Bystander

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    See Hirschfelder, Curtiss, and Bird, Molecular Theory of Gases and Liquids for the theoretical treatments --- it'll be in the library.
     
  5. Feb 28, 2005 #4

    Clausius2

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    Thanks both of you.

    AM, I am looking for a formulation, not only the historical background of the stuff.
     
  6. Mar 2, 2005 #5

    Clausius2

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    Thank you very much Bystander. I have found what I was looking for in Hirschfelder's book.
     
  7. Mar 2, 2005 #6

    Bystander

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    "The Green Monster" is the repository of all wisdom. You are welcome.
     
  8. Mar 3, 2005 #7

    Clausius2

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    "The Green and Heavy Monster" by the way. :smile:
     
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