:Determining Flow Rate/Velocity of Fluid in Low Vacuum

[Idea04]

Homework Statement

How do you determine the flow rate or velocity of a fluid moving towards a low vacuum from atmospheric force pushing the fluid towards the low vacuum?

Homework Equations

The Attempt at a Solution

 

[andrevdh]

Bernouilli's equation.

 

[Idea04]

I looked up the Bernouilli's equations, But I did't know which one to use. I would like to know the velocity and flow rate of a fluid be forced up a pipe by atmospheric pressure because of a partial vacuum.
Can you tell me which equation to look under. What category it would be under.