Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Dynamic pressure on a surface?

  1. Jan 22, 2008 #1
    Hello all,

    How would I calculate the pressure exerted on a surface by an engine in a vacuum, for example, if a lander was landing on Mars, I'm trying to calculate the pressure exerted on the surface by the exhaust. Should I simply be looking at P=F/A or should I be looking at dynamic pressure?

    Thanks in advance
     
  2. jcsd
  3. Jan 22, 2008 #2

    russ_watters

    User Avatar

    Staff: Mentor

    For pressure exerted on a surface by a moving fluid perpendicular to it, the static pressure is equal to the velocity pressure, and p=f/a applies.
     
    Last edited: Jan 22, 2008
  4. Jan 22, 2008 #3
    Hi Russ,

    Thanks for your reply, so where does the dynamic pressure come into it? If you were to calculate the Dynamic Pressure what would you be calculating?
     
  5. Jan 22, 2008 #4
    total pressure = P_hyd + P_stat + 1/2 * Rho * V^2
    (V is bulk velocity)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Dynamic pressure on a surface?
Loading...