Contents
Find another flow measurement calculator by clicking on the required answer which coincides with the input parameters you already know.
| vol flow | mass flow | flow speed | vol | mass | time | |
|---|---|---|---|---|---|---|
| area | flow speed | vol flow | ||||
| dia | flow speed | vol flow | ||||
| w x h | flow speed | vol flow | ||||
| time | vol | mass | vol flow | mass flow | ||
| vol | time | density | vol flow | |||
| mass | time | density | mass flow | |||
| density | mass flow | vol flow | mass | vol | ||
| flow speed | area, dia |
- Calculate volumetric flow rate from flow velocity and pipe diameter
- Calculate duct diameter from flow velocity and volume flow rate
- Calculate mass flow rate from volumetric flow rate and density
- Convert volumetric flow rates to other units
- Convert diameter into to other units
- Convert flow speed to other units
User Guide
This tool will calculate the flow velocity in any units from the specified volumetric flow rate of a substance flowing through a round duct or pipe of a chosen diameter. For each new calculation a unique conversion scale will be generated for the range of volumetric flow rates and flow speeds for the diameter specified.
Formula
The flow velocity formula used by this calculator is:
v = Q / (π · (ø / 2)²)
Derived from:
v = Q / A
A = π · r²
r = ø / 2
Symbols
- Q = Volume flow rate
- v = Flow velocity
- A = Cross-sectional area
- r = Radius
- ø = Diameter
n.b. This formula assumes uniform flow conditions within the entire cross-sectional area of pipe, without any friction losses near to surfaces.
Volumetric Flow Rate Measured
Enter the volumetric amount of substance that will flow pass in a unit of time.
Diameter
Enter the inside diameter of the circular pipe or duct.
Flow Velocity Calculation
This is the speed at which the substance is moving.