Flow hrough a venturi

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 gpmd1= 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


  • On February 18, 2018