What is the unit for coefficient of discharge?
Nomenclature
| Symbol | Name | fps units |
|---|---|---|
| A | Flow area | ft2 |
| BHP | Energy requirement | hp |
| Cd | Discharge coefficient (square edged hole=0.8, ragged hole=0.72, ductile failure=1.0) | decimal |
| ce | Erosion constant | ft/s |
What is coefficient of discharge in orifice?
The discharge coefficient is a dimensionless number used to characterise the flow and pressure loss behaviour of nozzles and orifices in fluid systems. Orifices and nozzles are typically used to deliberately reduce pressure, restrict flow or to measure flow rate.
Does the length of weir affect the discharge coefficient?
Broad-crested weirs (BCW) are often used in hydraulic engineering and water management. The most complex factor that affects the discharge capacity of BCW is the discharge coefficient. Discharge characteristics of weirs of finite crest length with upstream and downstream ramps.
Can coefficient of discharge be greater than 1?
In practice, the discharge coefficient cannot be greater than one.
What is the coefficient of orifice meter?
Orifice coefficient, generally, is 0.61 in case of flange taps and vena-contracta taps for NRe< 30,000. In the process of calculating fluid velocity with a orifice meter, the velocity of approach is not included.
Why discharge coefficient is high in Venturi meter than orifice meter?
In Venturi meter losses are less so coefficient of discharge is higher whereas in orifice meter due to no convergent and divergent cones there are more losses and hence its coefficient of discharge is less.In venturi meter losses are low due to steamline shape of the diffuser and the pressure gradient is not abrupt as …
What is the coefficient of discharge for a weir?
The flat-topped low weirs generally include broad-crested weir and short-crested weir. Under the same inflow condition, the discharge coefficient of short-crested weir is approximately 0.33–0.46, while that of broad-crested weir is 0.32–0.385, hence the former is stronger than the latter in terms of discharge capacity.
What is a weir coefficient?
The weir coefficient (as shown above in the weir equation) is a lumped parameter that includes the discharge coefficient, the gravitational constant, and constants based on geometric properties. For example, a weir coefficient (C) of 3.00 in English Units would be 1.66 in SI units.
Why is the discharge coefficient less than 1?
Plug in a coefficient for energy losses through turbulence and you have your formula. But you can see indeed that your coefficient can never be greater than one, because that would mean that you end up with more energy than you started with.
Why is the coefficient of discharge less than 1 orifice?
This is the reason why orifice meters are less accurate than venturi meters. Beyond the vena contracta point, the fluid expands again and velocity decreases as pressure increases. Losses in orificemeter are more as there is no convergent and divergent cones and therefore coefficient of discharge is less.
What is coefficient of discharge of Venturimeter?
The coefficient of discharge for Venturimeter, Cd is defined as the ratio of the actual flow rate through the venturi meter tube to the theoretical flow rate.
How to measure discharge using an orifice?
typical methods of measuring the discharge of an essentially incompressible fluid, whilst at the same time giving applications of the Steady-Flow Energy Equation (Bernoulli’s Equation). The discharge is determined using a Venturi Meter, an Orifice Plate Meter and a Rotameter.
How to calculate orifice coefficient?
Fill the supply tank with water and allow the water to flow through the orifice.
What is a coefficient of discharge?
Discharge Coefficient Equation. Valid for 0.4 ≤ C ≤ 0.8 and 0.2 ≤ β ≤ 0.7. Derivation of Discharge Coefficient Equation. Steady flow of an incompressible fluid through an orifice based on a discharge coefficient: Pressure loss from location 1 to 3 in the pipe written in terms of discharge coefficient: Pressure loss from 1 to 3 in the
What is the orifice equation?
F1-10 hydraulics bench;