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Pressure Relations

  1. May 18, 2009 #1
    In pipe flow of a viscous fluid, what happens to the head lost due to friction and "minor losses" (pipe bends, valves, etc).?I mean, if you decrease the dynamic pressure by reducing flow velocity, then the static pressure increases. If the dynamic pressure increases then the static pressure decreases, but the total pressure is always constant. Do losses reduce the total pressure?
  2. jcsd
  3. May 18, 2009 #2


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    Staff: Mentor

    Yes, losses reduce the total pressure and are dissipated as heat.
  4. May 18, 2009 #3
    So would the heat be dissipated into the fluid and into the pipe. ie. would the fluid temperature increase if there were fricitonal and minor losses (which i assume are frictional in nature too)?
  5. May 19, 2009 #4
    Yes, fluid heats up as. A part of the heat is conducted away by the pipe & rest heats up the fluid to a higher temperature.
  6. May 20, 2009 #5
    Excellent, thanks for your replies
  7. Jun 2, 2009 #6
    Hi All
    Hose ID 8mm, air pressure 0.5 kg/cm2, what will be the flowrate.
    Please describe with formula.
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