# Flow nozzle discharge coefficient

2019-12-08 12:30

not perfectly steady, thecapacity between the orifice and theflow nozzle on theend of the line introducesatime lag, sothat, though theEquations for ISO 5167 Orifice Coefficient Calculation Spreadsheet Included in ISO 5167 is an equation allowing calculation of the orifice discharge coefficient, C d, for known values of (dD), Reynolds number, Re, and L 1& L 2, where L 1 is the distance of the upstream pressure tap from the orifice plate and L 2 is the distance of the flow nozzle discharge coefficient

Yin, Z. Q. , et al. : Discharge Coefficient of Small Sonic Nozzles 1508 THERMAL SCIENCE, Year 2014, Vol. 18, No. 5, pp. sults show that the smaller the throat diameter of nozzle, the more obviously the length of diffuser impacts on discharge coefficients.

An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting flow (in the latter two cases it is often called a restriction plate). Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate. It uses the same principle as a Venturi nozzle, namely Bernoulli's principle which states that there is a The effective coefficient of discharge for flow nozzles in pipelines varies from 0. 96 to 1. 2 for turbulent flow and increases as the throattopipediameter ratio increases. Frequently, the upstream pressure connection is made through a hole in the wall of the conduit at a distance of about one pipe diameter upstream from the starting point of the flare of the nozzle (ASME, 1983). flow nozzle discharge coefficient The product of the discharge coefficient and the velocity approach factor, CE, is called the flow coefficient. For the orifice, the discharge coefficient is given by the equation 38

Discharge coefficient. This flow resistance, often expressed as a dimensionless parameter, , is related to the discharge coefficient through the equation: which may be obtained by substituting in the aforementioned equation with the resistance, , multiplied by the dynamic pressure of the fluid, . flow nozzle discharge coefficient The orifice flow meter is widely used for pipe flow measurement. The value of the orifice discharge coefficient for a particular orifice flow meter is needed to calculate the pipe flow rate from the measured pressure difference across an orifice in the flow path. Prior to 1991 changing the orifice opening size caused problems for determining the orifice 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. This article gives typical values of the discharge coefficient for common orifice and nozzle designs. A typical flow nozzle discharge coefficient value is between 0. 93 and 0. 98. Conclusion. With any of these three types of meters for pipe flow measurement, a means is needed to measure the pressure difference across the meter, p 1 p 2. Also the meter and pipe dimensions must be known and a value for the discharge coefficient is needed. The discharge from a sprinkler head or water mist nozzle can be calculated from the formula below: q kp 0. 5. when: q flow k nozzle discharge coefficient or kfactor for head p pressure. We can rewrite the formula to give us the kfactor as below: k q p 0. 5. or the pressure as below: p ( q k ) 2

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