FieldengFluid & Pressure
Velocity from Flow
Mean velocity from volumetric flow in a full circular pipe.
Mean velocity from volumetric flow in a full circular pipe.
App id: FLUID-02. Reference version 1.0.
How to fill it
Fill the inputs. The tool shows the outputs.
On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.
Formula
v = 4Q / (π D²)Inputs
| Name | Unit |
|---|---|
| Volumetric flow (camera) | m3/s |
| Inside diameter | mm |
Outputs
| Name | Unit |
|---|---|
| Mean velocity (hero result) | m/s |
| Flow area | m2 |
Diagnose
Observations are context. They do not pass or fail a structure. See Diagnose.
| When | Observation | Severity |
|---|---|---|
Mean velocity < 0.3 | Low velocity | info |
Mean velocity > 5 | High velocity | caution |
Mean velocity > 3 | Elevated velocity | info |
Assumptions
- Circular, full pipe. Negative flow is rejected.
Provenance
- Continuity for incompressible flow in a full circular pipe.