| Venturimeter |
Orifice meter |
|
|
| Losses are very ow and hence, coefficient of discharge (Cc) is high. In general, Cd = 0.98. |
Losses are high and hence, coefficient of discharge (Cd) is less. In general, Cd = 0.64 |
|
|
| Suitable for measurements of higher flow rates. |
Not suitable for measurements of higher flow rates. |
|
|
| Cost of installation and replacement is more. |
Cost of installation and replacement is less. |
|
|
| More space is required. |
Less space is required. |
|
|
| They can be used to measure flow rates of all incompressible fluids (gases with low variations in pressure as well as liquids). |
They are generally used to measure flow rates of liquids. |
|
|
| Here, the flow is accelerated gradually in converging section with subsequent gradual decrease in pressure. |
Here, the entire pressure drop occurs instantly, when flow passes through orifice. |
