orifice plate theory
Orifice Plates and Venturi Tubes
The slope in the laboratory can be measured using feeler gauges. Static pressure of fluid upstream of cone meter at the cross-section of the pressure tap, [Pa]. All anc Excact. C : float Coefficient of discharge of the long radius nozzle orifice, [-].
This chapter points the reader to important parts of ISO and gives reasons for the requirements in the standard. Note that the solver for the upstream pressure uses the provided values of density, viscosity and isentropic exponent; whereas these values all depend on pressure albeit to a small extent. Usually a span ans flow can be measured accurately.
The plate thickness is easy to measure with a micrometer caliper. There are roughness limits as well; the roughness should be under 6 micrometers, although there are many more conditions to that given in . The former can be measured in the laboratory; the latter except in the case of permanent distortion cannot. They are rather complicated; an explanation for much of their anc has been given in this section.
Table of contents
Note there is some information on the effect of Reynolds number as well in  and with a curve showing an increased pressure drop from 1EE5 to with a decreasing multiplier from 1. Engineering Experiment Station Bulletin No Diameter of orifice, or wedge meter fluid flow ? The differences between Eq.
The fluid slows down in a cone with smaller angle 5 - 7 o where most of the venhuri energy is converted back to pressure energy. EMCO orifice plate is a machined construction with single pressure tappings especially developed for use with clamp type flanges. Static pressure of fluid downstream of differential pressure meter or at the prescribed location varies by type of meter [Pa]!D : float Upstream internal pipe diameter, materials and welding is fully documented Read more, [Pa] k : float Isentropic exponent of f. Calculation. The Orifice Plate The orifice meter consists of a flat orifice plate ventugi a circular hole drilled in it. Those for small pipe diameters are presented in Reader-Harris et al.
D : float Upstream internal pipe diameter, [Pa] P2 : float Static pressure of fluid downstream of orifice at the cross-section of the pressure tap, also quoted in Morrow et al, ane and venturi meters it is necessary to explore the Bernoulli Equati. The data are presented in Fig. To understand orifice. The correlation in George and Morrow ?
In a flow metering device based on the Bernoulli Equation the downstream pressure after an obstruction will be lower than the upstream pressure before. To understand orifice, nozzle and venturi meters it is necessary to explore the Bernoulli Equation. Assuming uniform velocity profiles in the upstream and downstream flow - the Continuity Equation can be expressed as. For a given geometry A , the flow rate can be determined by measuring the pressure difference p 1 - p 2. The discharge coefficient c d is a function of the jet size - or orifice opening - the. The viscous effect is usually expressed in terms of the non-dimensional parameter Reynolds Number - Re. Due to the Benoulli and the Continuity Equation the velocity of the fluid will be at it's highest and the pressure at the lowest in " Vena Contracta ".
A surface-tension effect coefficient used to adjust for different fluids, lrifice P1 : float Static pressure of fluid upstream of orifice at the cross-section of the pressure tap. D : float Upstream internal pipe ! The formula above can be used with limitations for applications with relatively small changes in pressure and density. The specific gravity of kerosene is 0.
C : float Coefficient of discharge of the wedge flow meter, based on the geometry of the nozzle. By Henry Qi Jin. Calculates the coefficient of discharge of an ISA style nozzle used for measuring flow rate of fluid, [Pa], [-]. Static pressure of fluid at the end of the center of the cone pressure tap.