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Homework Help: Kinematic viscosity depends on pressure

  1. Feb 25, 2016 #1
    1. The problem statement, all variables and given/known data
    I was told that kinematic viscosity depends on pressure , but not dynamic viscosity

    2. Relevant equations

    3. The attempt at a solution
    in my opinion, the dynamic viscosity depends on pressure , since it's formula is μ = tau / (du/dy) , where tau is the stress . and stress can be somehow related to pressure
  2. jcsd
  3. Feb 25, 2016 #2
    It is true that pressure is a contributor to the stress tensor, but this contribution is independent of the portion related to the shear viscosity.
  4. Feb 25, 2016 #3
    so , which is correct ? kinematic viscosity or dynamic viscosity depends on pressure?
  5. Feb 25, 2016 #4
    For an ideal gas, kinematic viscosity varies inversely with pressure (because density is proportional to pressure), and dynamic viscosity does not vary with pressure.
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