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Flow rate/pressure in a venturi

  • #1
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Homework Statement


Hi Guys,

I have found that as flow rate increases the pressure difference in the sections of the venturi increases. Would someone please mind explaining in words why as I'm not sure.

Homework Equations




The Attempt at a Solution


Well I know that when the fluid gets to a constricted section the velocity increases and the pressure decreases but I'm not sure why the pressure difference between the non constricted section and the constricted section increases with increased flow rate.

Thanks very much
 

Answers and Replies

  • #4
rude man
Homework Helper
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714

Homework Statement


Hi Guys,

I have found that as flow rate increases the pressure difference in the sections of the venturi increases. Would someone please mind explaining in words why as I'm not sure.

Homework Equations




The Attempt at a Solution


Well I know that when the fluid gets to a constricted section the velocity increases and the pressure decreases but I'm not sure why the pressure difference between the non constricted section and the constricted section increases with increased flow rate.

Thanks very much
Think Bernoulli: p + ρv2 = constant if there is no change in potential energy
 

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