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Flow rate/pressure in a venturi

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  1. Feb 12, 2015 #1
    1. The problem statement, all variables and given/known data
    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.

    2. Relevant equations


    3. 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
     
  2. jcsd
  3. Feb 12, 2015 #2

    DEvens

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  4. Feb 12, 2015 #3
  5. Feb 14, 2015 #4

    rude man

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