# What is coefficient of discharge of orifice meter?

## What is coefficient of discharge of orifice meter?

Explanation: Coefficient of discharge (Cd): It is the ratio of actual discharge to theoretical discharge. As in a pipe, frictional losses are present therefore Qactual will always be less than Qtheoretical.

### What is discharge coefficient of orifice plate?

Summary. 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 flow coefficient of an orifice?

The flow coefficient of a device is a relative measure of its efficiency at allowing fluid flow. It describes the relationship between the pressure drop across an orifice valve or other assembly and the corresponding flow rate.

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 value of coefficient of discharge?

It is a non-dimensional quantity which differs directly as the flow of discharge. The value of Cd is high in nozzle measurement of flow, whereas its value is small in orifice measurement of flow….Coefficient Of Discharge.

Coefficient of discharge, Cd Measuring equipment
Nozzle 0.90
Orifice 0.61
Venturi-meter 0.986

## Why is coefficient of discharge for Venturimeter greater than orifice meter?

### What is the use of coefficient of discharge?

The discharge coefficient can be thought of as a correction factor for “real” flow meter devices. It is typically determined experimentally for different flow meters. Correlation equations can be used to calculate the real “corrected” flow rate through a given meter.

#### Does discharge coefficient have units?

In Equation (14.18) the discharge coefficient C d = ( 2 / 3 ) ( 2 g / 3 ) = 1.705 in metric units and, in Equation (14.19), C ′ d = ( 2 / 3 ) 2 / 3 = 0.544 in non-dimensional units.

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 do you calculate the discharge coefficient?

– H = Head of water on the upstream side of the weir – h = Head of water on the downstream side of the weir – v = Velocity of the water on the downstream side of the weir (i.e., at B) – Cd= Coefficient of discharge and – L = Length of the weir

## How to calculate discharge coefficient?

Definitions

• Introduction. There are two distinct uses for nozzles and orifice plates.
• Discharge Coefficient Values. Where a higher degree of accuracy is required,such as for flow rate measurement,the relationships below may be used.