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 speed and the width x height of the duct
- Calculate mass flow rate from volumetric flow rate and density
- Convert volumetric flow rates to other units
- Convert width and height into to other units
- Convert flow speed to other units
User Guide
This tool will calculate the velocity in any units from the specified volumetric flow rate of a substance flowing through a rectangular duct of a defined width and height. For each new calculation a unique conversion scale will be generated for the range of volumetric flow rates and flow speeds for the length and width specified.
Formula
The flow velocity formula used by this calculator is:
v = Q / (w · h)
Derived from:
v = Q / A
A = w · h
Symbols
- Q = Volume flow rate
- v = Flow velocity
- A = Cross-sectional area
- w = Width
- h = Height
n.b. This formula assumes uniform flow conditions within the entire cross-sectional area of duct, 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.
Width
Enter the internal width of the section of duct being used to measure flow.
Height
Enter the internal height of the section of duct being used to measure flow.
Flow Velocity Calculation
This is the speed at which the substance is moving.