It requires the flow of axial velocity vectors. It causes a pressure drop in the fluid . Its accuracy is affected by the density, pressure and viscosity of the fluid. The range of measurement of viscosity limits of fluids.
What are the advantages and disadvantages of orifice plates?
- Simple in construction, the standards for construction and calibration are readily available.
- They are cheap; their price does not increase dramatically with size.
- Easy to install and remove.
- They are efficient and reliable for many years.
- Available in many materials.
What are the advantages and disadvantages of Venturimeter?
Advantages and disadvantages of Venturi meter
Smooth construction and low cone angle help to solid particles flow through it . So it can be used for dirty fluids. It can be installed in any direction horizontal, vertical and inclined. More accurate than orifice and flow nozzle.
Why orifice plate is used?
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 ).
Which is better Venturi or orifice?
The Venturi meter can handle large range of flow rates of fluid than the Orifice meter but once the Venturi meter is installed the range of flow rates it can handle becomes fixed. ... Thus, Orifice meters offer much more flexibility of operation.
What is main disadvantage of orifice meter?
Disadvantages of orifice meter:
It requires the flow of axial velocity vectors. It causes a pressure drop in the fluid . Its accuracy is affected by the density, pressure and viscosity of the fluid. ... The pipe must be totally special for the measurement of the flow of liquids.
How many types of orifice plates are there?
There are mainly three types of orifice plates available. Let s take a close look at these three types. Concentric These are most commonly used in pipes below six inches for measuring flow rate of gases, liquids, and steams.
What are the advantage and disadvantage of turbulent flow?
A turbulent flow can be either an advantage or disadvantage. A turbulent flow increases the amount of air resistance and noise ; however, a turbulent flow also accelerates heat conduction and thermal mixing. Therefore, understanding, handling, and controlling turbulent flows can be crucial for successful product design.
Why Venturimeter has better performance than orifice and flow nozzle?
They can handle 25-50% more flow rate than an orifice . Orifice plates are smaller in size when compared to venturimeters. It can be used in a wide range of pipe sizes from 3.175 mm to 18211.8 mm. The size of the venturimeter is specified in terms of inlet pipe diameter and the throat diameter.
Why should I prefer Venturimeter over an Orificemeter?
1. Both are used to calculate the velocity of a fluid. 2. ... A venturi meter can be used to measure the flow rates of all incompressible fluids (gases with low pressure variations, as wells as liquids), whereas an orifice meter is generally used for measuring the accelerated flow through the apparatus .
Does orifice affect flow rate?
A reduction in orifice size results in decreased flow as only so much liquid can pass through the orifice. ... Since the flow of liquid is limited by the orifice, it follows that the pressure on the exit side of the orifice is less than that on the inlet side.
What are the types of orifice?
- Square Edge (Standard) Bore. For the common square edge concentric bore orifice, the bore and bevel is the standard method of limiting the plate edge thickness. ...
- Quadrant Edge Bore. The quadrant edge bore is an orifice with the inlet edge rounded. ...
- Eccentric Bore. ...
- Segmental Bore. ...
- General Description.
What is the function of orifice meter?
Orifice meter: is a device used for measuring the rate of flow of a fluid flowing through a pipe . It is a cheaper device as compared to venturimeter. This also work on the same principle as that of venturimeter. It consists of flat circular plate which has a circular hole, in concentric with the pipe.
What is the difference between orifice and mouthpiece?
Mouthpiece is basically used in order to determine the rate of flow of fluid. Dimension of mouthpiece will be comparatively larger than the dimension of orifice . Therefore, flow through the mouthpiece will be quite larger as compared with flow through the orifice.
How accurate are Venturi meters?
Note that by default, Venturi flow meters offer an accuracy of around ±1% of the discharge coefficient . Optimum calibration allows an even greater accuracy of up to ±0.25%. Venturi nozzle flow rate measurement systems are marginally more expensive than orifice-style flow meter systems.
What happens in a Venturi?
The Venturi effect states that in a situation with constant mechanical energy, the velocity of a fluid passing through a constricted area will increase and its static pressure will decrease . ... In the tube depicted above, a fluid flows from left to right at a constant volume flow rate.
