Venturi Tube Calculator

Help

First of all, select either gas or liquid as fluid that flows through the Venturi tube. Then, start entering known values (note: first choose the unit of measure and then enter a number because when changing units of measure, new value is automatically calculated. Units of measure are in SI and English system).

First four values - bigger diameter of the Venturi D₁, smaller diameter of the Venturi D₂, the coefficient of discharge C, and pressure measured on the inlet, bigger diameter p₁ are needed for both liquids and gases.

Then choose if pressure on the smaller diameter p₂, or pressure drop p₁-p₂ is known, and enter either one. The other one (that is not entered by you) will be calculated together with four main values (Q, G, V₁, V₂)

If the selected fluid is gas then it is necessary to choose which value is known, either temperature T, or density rho. Enter a value for either, and the one that is not entered will be calculated together with four main values (Q, G, V₁, V₂).Flow through the Venturi tube is considered as incompressible so rho and T are constant through tube.

For gases it is necessary to enter the value for gas constant R (for air R=287 J/kgK). If the selected fluid is liquid then it is necessary to enter value for rho. Values for temperature T and gas constant R are not needed and will not be calculated, obviously.

Pressing the Calculate button, values of volumetric flow Q, mass flow G, velocity on the bigger diameter V₁, velocity on the smaller diameter V₂ are calculated, together with the other non entered values.

Pressing the Create report button, a new window will open with the report of calculation. In the window you can edit report, then copy and paste it in your favorite text editor and format text.

If you have any problems using calculator please contact me!