What is discharge coefficient in fluid mechanics?
In a nozzle or other constriction, the discharge coefficient (also known as coefficient of discharge or efflux coefficient) is the ratio of the actual discharge to the theoretical discharge, i.e., the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an identical …
What does the discharge coefficient depend on?
In a single phase flow, the discharge coefficient depends mainly on the Reynolds number and the beta factor. Dependence on Reynolds numbers is very weak (except low Reynolds numbers), so the performance of differential flow meters is rather insensitive to liquid viscosity.
What is the general value of coefficient of discharge?
It is defined as the ratio of the actual discharge from an orifice to the theoretical discharge from the orifice. It is denoted by. If Q is actual discharge and is the theoretical discharge then mathematically is given as = The value of varies from (0.61) to( 0.65). for general purpose the value of is taken as (0.6.).
What is the importance of coefficient of discharge?
An important element in this process is the discharge coefficient, which is defined as: “In a nozzle or other constriction, the ratio of the mass flow rate at the discharge end of the nozzle to that of an ideal nozzle which expands an iden- tical working fluid from the same initial conditions to the same exit pressure” …
What is coefficient of discharge in Venturimeter?
The discharge coefficient of a Venturi meter is typically 0.985, but may be even higher if the convergent section is machined. Discharge coefficients for uncalibrated Venturi meters, together with corresponding uncertainties, are given in ISO 5167-1: 1991.
Can a discharge coefficient be greater than 1?
In practice, the discharge coefficient cannot be greater than one. This is a fact. The error may be in compensating the values of the variables in the equation. Verifies units, values, and homogeneity of area values.
What is the importance of discharge coefficient?
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.
Can coefficient of discharge be greater than 1?
Is discharge coefficient a constant?
Unlike the flow coefficient, discharge coefficient is dimensionless and almost constant value for any diameter of a single model. For the same high of fluid in the reservoir, higher is the discharge coefficient, higher is the flow rate, therefore the reservoir can be voided at shorter time.