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HX design

  1. Mar 30, 2010 #1
    Hi. I'm doing research for developing new heat exchanger for cryoprobe.
    I got a problem in calculating mass flow rate, m dot, in the pipes.
    I know density, area and pressure and other things of each side.
    I'm using N2O in 300K and the area is 3.78mm^2, pressure changed from 4000psi to 14.7psi using expansion valve like orifice.
    It flows through helical curve(length = 138mm at mid point) which has 30 rotations.
    How can i get the velocity of the fluid?

    ps. is there anyone who have any information of commercialized cryoprobe's properties, HX design like mass flow rate and cooling capacity??? please let me know
    Last edited: Mar 30, 2010
  2. jcsd
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