Pipe Mean Velocity
Compute mean velocity v from flow Q (m³/h) and pipe dia. d.
Inputs
Formula
v = Q/(A·3600), A = πd²/4
Velocity drives pressure loss and erosion; keep in range.
Fundamentals
Compute mean velocity v from flow Q (m³/h) and pipe dia. d.
This tool computes Pipe Mean Velocity from the formula: v = Q/(A·3600), A = πd²/4
History
Fluid mechanics and heat transfer were established in the 18th–19th centuries with steam engines and thermodynamics.
Engineering applications
Used for piping, heat-exchange and hydraulic system estimates.
Glossary
| Flow Q | Input parameter |
| Pipe dia. d | Input parameter |
| Area A | Output result |
| Velocity v | Output result |
How to use
- Fill in Flow Q, Pipe dia. d in the Inputs section (watch the unit on each field).
- Click Calculate; the tool evaluates the formula shown above.
- Read Area A, Velocity v in the results area.
Formula · Worked Example · Knowledge
Formula
核心计算关系：v = Q/(A·3600), A = πd²/4
输入变量：
- Flow Q
Q— m³/h - Pipe dia. d
d— mm
输出结果：
- Area A
A— mm² - Velocity v
v— m/s
假设/适用：Flow formulas assume steady, incompressible, continuous flow; correct for compressible/high-speed.
Worked Example
根据公式 v = Q/(A·3600), A = πd²/4，取 Flow Q = 10 m³/h；Pipe dia. d = 50 mm。
代入计算得：Area A = 1,963 mm²；Velocity v = 1.415 m/s。
Key Points
- Flow formulas assume steady, incompressible, continuous flow; correct for compressible/high-speed.
- Reynolds Re sets laminar/turbulent; friction f depends on regime & roughness.
- Energy eqn includes elevation, pressure and velocity heads; keep units as length.
Parameters
Inputs
| Parameter | Symbol | Unit | Default |
|---|---|---|---|
| Flow Q (m³/h) | Q | m³/h | 10 |
| Pipe dia. d (mm) | d | mm | 50 |
Outputs
| Result | Symbol | Unit |
|---|---|---|
| Area A | A | mm² |
| Velocity v | v | m/s |
Applications
- Pipe flow rate and pressure drop
- Hydraulic cylinder force/speed design
- Flow-meter selection and calibration
FAQ
What formula does this tool use?
This tool computes per ISO / AGMA / ASME standard formulas: v = Q/(A·3600), A = πd²/4
How accurate are the results?
Results match input precision, based on SI units and common engineering approximations; for critical duty re-check with a safety factor.
Where is it used?
Pipe flow rate and pressure drop