# Flow through a venturi

Flow through a Venturi V015-1

In another paper I gave you the formula for computing the approximate flow through an orifice or nozzle. Here is the formula for an approximate flow through a venturi tube

For any venturi tube use:

Or you can use:

Q = flow, in gpm

d_{1}= diameter of venturi throat in inches

d_{2} = diameter of main pipe in inches

H = difference in head between upstream end and throat.

These formulas will work for any liquid with a viscosity similar to water.

- The values given here are for water.
- 32.174 feet/ second/ second was used for the acceleration of gravity
- 7.48 gallons/ cubic foot was used to compute the constants

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- On February 17, 2018