Flow through a Venturi 16-3

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

d₁= diameter of venturi throat, inches

d₂ = diameter of main pipe, 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 were 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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