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Incompressible viscous flow

  1. Sep 26, 2011 #1
    I'm looking at this problem wich states:

    "A parallel air flow along a semi infinite flat plate has undisturbed parameters as follows: "

    Then they list the speed, temprature, viscousity and pressure.

    "Demonstrate that the boundary layer can treated by means of incompressible analysis. "

    The solution says:

    Incompressible if M[itex]^{2}_{\infty}[/itex]>>4

    Where M[itex]^{2}_{\infty}[/itex]=[itex]\frac{U^{2}}{\gamma R T}[/itex]

    I'm just wondering what formula this is? I've never seen it before.
    What is M ?
  2. jcsd
  3. Sep 26, 2011 #2


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    M is the Mach Number.
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