Pressure Relations

  • Thread starter redargon
  • Start date
  • #1
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Main Question or Discussion Point

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?
 

Answers and Replies

  • #2
russ_watters
Mentor
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Yes, losses reduce the total pressure and are dissipated as heat.
 
  • #3
354
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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)?
 
  • #4
738
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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.
 
  • #5
354
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Excellent, thanks for your replies
 
  • #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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