What's meaning of pressure drop for fluid?

qihongming · April 30, 2009, 03:41

I need calculation the pressure drop of heat exchanger(shell fluid pressure drop),however I don't know what's the meaning of pressure drop? is it the inlet total pressure minus outlet total pressure? or inlet static pressure minus outlet static pressure? or hydraulic loss times dynamic pressure? please help me.

Ananda Himansu · April 30, 2009, 13:05

The basic definition of pressure drop for a heat exchanger is Inlet Total Pressure minus Outlet Total Pressure. This pressure drop is characterized as due to a sort of frictional resistance, and therefore a nondimensional Hydraulic Loss Coefficient or Friction Coefficient is defined as the pressure drop divided by the dynamic pressure. The dynamic pressure is chosen as the reference, because actual viscous losses are a function of the dynamic pressure.

April 30, 2009, 03:41	What's meaning of pressure drop for fluid?	#1
qihongming New Member qihongming Join Date: Mar 2009 Posts: 14 Rep Power: 17	I need calculation the pressure drop of heat exchanger(shell fluid pressure drop),however I don't know what's the meaning of pressure drop? is it the inlet total pressure minus outlet total pressure? or inlet static pressure minus outlet static pressure? or hydraulic loss times dynamic pressure? please help me.

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April 30, 2009, 13:05		#2
Ananda Himansu New Member Ananda Himansu Join Date: Apr 2009 Location: Cleveland, Ohio, USA Posts: 17 Rep Power: 17	The basic definition of pressure drop for a heat exchanger is Inlet Total Pressure minus Outlet Total Pressure. This pressure drop is characterized as due to a sort of frictional resistance, and therefore a nondimensional Hydraulic Loss Coefficient or Friction Coefficient is defined as the pressure drop divided by the dynamic pressure. The dynamic pressure is chosen as the reference, because actual viscous losses are a function of the dynamic pressure.