Fluid mechanics
Venturi Meter
Many flow meters work by changing the flow area at a measuring section and reading the resulting pressure difference. The venturi meter is one of them.
A venturi meter measures discharge in a pipeline. Its head loss is lower than that of an orifice meter, which is why it is preferred at higher flow rates. It consists of a converging tube followed by a diverging tube, joined at the throat (the section with the smallest cross-section).
The meter is installed along a pipeline with enough straight length to stabilise the flow. Pressure taps are placed at four points along the meter. The pressure-head difference between sections can be read on a manometer. A valve at the end of the pipeline sets the discharge.
Specifications
| Dimensions | 150 × 40 × 150 cm |
|---|---|
| Power supply | 220 V |
| Pipe material | Galvanised steel, PPR, PLA |
| Maximum pressure | 1.5 bar |
| Pipe diameter | 26 mm |
| Throat diameter | 16 mm |
Learning outcomes
- Measure the water flow rate using the manometer height.
- Observe head losses across the venturi.