Bernoulli's Equation and tube vacuum

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SUMMARY

This discussion focuses on the application of Bernoulli's Equation in the context of a venturi tube with a secondary opening for air induction. The user inquires whether a different equation is needed for calculating the rate of air induction based on the differential pressure created by the venturi effect. It is established that Bernoulli's Equation can still be applied to the secondary opening, provided the vacuum does not exceed 13.2 psia, and a discharge coefficient should be used to account for non-ideal flow conditions.

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I have a venturi tube and downstream of it, there is a small secondary opening at the end of the throat. This is where the local vacuum is created as the velocity increases and the pressure decreases. This difference between this pressure and the atmospheric pressure will induce air into the secondary opening. Does anybody know if I have to use another equation for the rate of air induction versus this differential pressure or will the same Bernoulli's equation for pressure drop through the venturi tube still apply? If there is another equation, do you know what it is? Thanks!
 
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If your vacuum is not too large (say 13.2 psia), you could apply the Bernoulli equation to this "air hole" also. You should use a discharge coefficient for the air hole since flow will not be ideal.
 

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