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Pressure across an orifice/choke plate

  1. Jul 18, 2014 #1
    I've been trying to calculate the diameter for an orifice plate so that when inserted in a pipe it restricts the mass flow to the value I want (1.5 kg/s of compressed air, total pressure= 400 psia, T=300K). So essentially I am trying to design a choke plate. When a flow goes across an orifice plate, does the total pressure drop ? I can understand that the static pressure drops and velocity increases. But I simply can't get why the total pressure has to drop. Does it have something to do with momentum losses ?
    Answering this would really help me sort out my confusion.

  2. jcsd
  3. Jul 21, 2014 #2


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