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Thermodynamics entropy problem

  1. Oct 10, 2008 #1
    air flows at 2.3kg/s in 15cm diameter pipe. it has pressure= 7bar and temperature=368K before getting throttled by a valve to 3.5bar.
    whats the velocity downstream and the change in entropy??

    data: y=1.4, C_p=1005J/kgK, R=287

    i really am a little lost as to how to proceed
  2. jcsd
  3. Oct 11, 2008 #2


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    Welcome to PF!

    Hi deepthishan! Welcome to PF! :smile:

    Use Bernoulli's equation … if you're still stuck, show us how far you've got, and then we'll know how to help. :smile:
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