How do you find the discharge coefficient of an orifice?
The discharge coefficient of an orifice or nozzle is defined as the ratio of the actual to theoretical flow rate:
- Cd=Measured Flow RateTheoretical Flow Rate (1)
- η=σΔp12ρ¯V2 (6)
- ξ=σΔp¯Δp (7)
What is discharge coefficient of orifice plate?
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.
What is the general value of coefficient of discharge?
Coefficient of discharge is stated as the ratio between the actual flow discharge and theoretical flow discharge. It is also referred to as the ratio of mass flow rate at nozzle’s discharge edge to the standard nozzle which enlarges an exact working fluid maintained at the similar initial conditions and pressures.
What is the value of coefficient of discharge in orifice meter?
A discharge coefficient cd = 0.60 may be taken as standard, but the value varies noticeably at low values of the Reynolds number. The pressure recovery is limited for an orifice plate and the permanent pressure loss depends primarily on the area ratio.
What is the coefficient of discharge for a Venturi meter?
The effective discharge coefficient for venturi meters ranges from 0.9 to about unity (Streeter, 1951; American Society of Mechanical Engineers, 1983) with turbulent flow, and it varies with diameter ratio of throat to pipe.
What are the factors that affect the discharge coefficient value?
The parameters affecting the discharge coefficient were determined and the relationships between the coefficient and four parameters, that is, the ratio of the water head to the upstream water level, the ratio of orifice height to orifice-weir height, the ratio of orifice height to the water head, and the ratio of the …
What is the relation between coefficient contraction CC coefficient of velocity CV coefficient of discharge CD )?
Coefficient of discharge (Cd) = Coeff. of flow/velocity (Cv) x Coeff of contraction (Cc). If you know coeff. of flow/velocity (Cv) , you will be able to calculate coeff of discharge (Cd), once Cc is known.
Why Venturimeter VM coefficient is more than orifice meter OM coefficient?
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 …
Why is the discharge coefficient for the orifice meter far lower compared to the discharge coefficient for the Venturi meter?
Because of the sudden contraction at the orifice and the subsequent sudden expansion after the orifice, the coefficient of discharge C for the orifice meter is much lower than that of a venturi meter or a flow nozzle.
What is the value of coefficient of discharge for Venturimeter and orifice meter?
Detailed Solution. Explanation: Coefficient of discharge is the ratio of actual discharge to the theoretical discharge. ∴ Coefficient of discharge for venturi meter lies is higher than the nozzle meter and orifice meter.
Why is coefficient of discharge for Venturimeter greater than orifice meter?
What are the units of coefficient of discharge?
Symbols and units for discharge coefficient equations: A o =orifice area (m 2), A p =pipe area (m 2), d=orifice diameter (m), D=pipe inside diameter (m), P 1 -P 2 =differential pressure (N/m 2), P 1 -P 3 =non-recoverable pressure difference (N/m 2), Q=flow rate (m 3 /s), V o =velocity through orifice (m/s), V p =velocity in pipe (m/s), ρ=fluid mass density (kg/m 3).
What is the importance of coefficient of discharge?
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.
What is a discharge coefficient?
Coefficient Of Discharge. Coefficient of discharge is stated as the ratio between the actual flow discharge and theoretical flow discharge. It is also referred to as the ratio of mass flow rate at nozzle’s discharge edge to the standard nozzle which enlarges an exact working fluid maintained at the similar initial conditions and pressures.
Is coefficient of discharge constant?
The discharge coefficient is defined as the ratio of actual discharge to theoretical discharge. The coefficient of discharge equals the actual discharge divided by the theoretical discharge. The discharge coefficient is related to the mass flow rate of a fluid via a straight tube of a constant cross-sectional…
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