Active

To use calculator you should enable java script in your browser.

Action

Calculation setup

Pressures

Flow rates and velocities

Venturi dimensions and coefficients

Read more about calculator application and check if calculator is suitable for your problem.

Also, read about calculation procedures, what you have to know for the calculations and what limitations apply.

Subscribed users have access to the full service which includes:

- One click switch from metric to imperial units
- Export results in word or excel format
- Preview, copy and paste results from a web page to your text editor
- Send results to you email

Read all about available deployments. In any way of utilizing calculator, Internet connection is required, for authentication at least.

- p
_{1}- inlet pressure - Absolute pressure at the Venturi inlet
- p
_{2}- throat pressure - Absolute pressure at the Venturi throat
- Δp - pressure drop
- Measured pressure difference
- D
_{1}- inlet diameter - Venturi internal inlet diameter
- D
_{2}- throat diameter - Venturi throat diameter
- e - expansion factor
- Coefficient used for compressible flow calculation
- C - coefficient of discharge
- Coefficient used for Venturi tube based on ISO 5167
- R
_{eD}- inlet Reynolds - Reynolds number calculated in front of the Venturi tube
- R
_{ed}- throat Reynolds - Reynolds number calculated at the Venturi tube throat
- q
_{1}- volumetric flow rate - Fluid flow rate in terms of units of volume per unit of time on the inlet conditions
- q
_{}- standard flow - Flow rate at standard conditions. Used only if the selected fluid is gas.
- ṁ - mass flow rate
- Fluid flow rate in terms of units of mass per unit of time
- V
_{1}- upstream velocity - Flow velocity at the Venturi tube inlet where flow diameter is D
_{1} - T
_{1}- upstream temperature - Fluid temperature for gas density calculation based on the ideal gas state equation
- ρ
_{1}- upstream density - Fluid density at the Venturi inlet in terms of mass per unit of volume
- R - gas constant
- Gas constant in terms of energy per unit of mass and temperature, for gas density calculation using ideal gas state equation
- κ - isentropic coefficient
- Specific heat ratio
- ν - kinematic viscosity
- Result of fluid particles colliding to each other and moving at different velocities in terms of area per square unit of time
- μ - dynamic viscosity
- Result of fluid particles colliding to each other and moving at different velocities in terms of mass per square unit of distance and time

- Select Venturi tube type based on its manufacturing technology
- Welded
- Venturi tube manufactured by welding
- Casted
- Venturi tube manufactured by casting
- Machined
- Venturi tube manufactured by machining

- Select value to input. You should enter selected one. The other one will be calculated
- p
_{2} - pressure in the throat of the Venturi tube
- Δp
- measured pressure difference in front and in the throat of the Venturi tube

- Select value to input. You should enter selected one. The other one will be calculated
- ν
- kinematic viscosity
- μ
- dynamic viscosity

- Select value to input. Available only if gas is selected. You should enter selected one. The other one will be calculated
- T
_{1} - upstream temperature.
- ρ
_{1} - upstream density.

- Select fluid type
- Gas
- for compressible flow where ideal gas state equation is applicable
- Liquid
- for incompressible flow of liquids

- Application of ISO 5167 constraints
- ISO constraints
- Deselect if you don't want to check if the Venturi tube and the flow conditions are within the limits of the ISO standard.