Venturi meter and orifice meter are used for measuring the volumetric flow rate of the fluid that based on the continuity equation and Bernoulli’s equation. ... Whereas the orifice meter consists of a thin plate and a bore. The pressure loss in venturi meter is 10% while in the orifice meter the pressure loss is 50-60%.
Which is more accurate Venturi or orifice?
Measurement of mass flow rate of fluid in fluid mechanics is by meters ( venturimeter , orifice meter) connected at the entrance and at throat by recording pressure drop by manometer. Out of these, venturimeter is found to be the most accurate device for measurement of mass flow rate.
What is the difference and the similarity between orifice meter and Venturi meter?
Orifice has a precisely measured hole in the middle and is inserted in the pipeline to reduce pipe diameter and thereby to offer obstruction. Venturimeter consists of a straight inlet section, a converging conical inlet section, a cylindrical throat and a diverging conical outlet section.
Why is a venturimeter more accurate than an orifice meter?
Explanation: The Venturimeter readings are more accurate than Orificemeter. ... Explanation: A manometre is connected to a section which is at a distance of about 1.5 to 2.0 times the pipe diameter upstream from orifice plate. 8. Venturimeter is based on integral form of Euler’s equation.
What are the advantage and disadvantage of Venturi meter and orifice meter?
Advantages of venturi meter:
Its behaviour can be predicted perfectly . It can be installed vertically, horizontally, inclined. They are more precise and can be used for a wide range of flows. About 90% of the pressure drop can be recovered.
What is the principle of orifice meter?
Basic Working Principle of an Orifice Meter
The liquid or gas whose flow rate is to be determined is passed through the orifice plate . This creates a pressure drop across the orifice plate which varies with the flow rate, resulting in a differential pressure between the outlet and inlet segments.
What are the applications of Bernoulli’s Theorem?
- (i) Lift of an aircraft wing. A section of an aircraft wing and the flow lines are shown in Fig. ...
- (ii) Blowing of roofs. During a storm, the roofs of huts or tinned roofs are blown off without any damage to other parts of the hut. ...
- (iii) Bunsen burner. ...
- (iv) Motion of two parallel boats.
How accurate is a venturi meter?
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.
Does an orifice increase pressure?
An orifice affects flow rate (volume) down, and pressure up, as it decreases in diameter . Vice versa, it increases volume, while dropping in pressure and velocity.
Which flowmeter is the most accurate?
Coriolis mass flow meters produce the most accurate for most liquids but are expensive. They have the advantage of not needing any knowledge about the fluid being carried. Thermal mass flow meters are a less accurate but still direct measurement method. They do require knowledge of the fluid’s specific heat capacity.
Why is Bernoulli’s equation used?
Bernoulli’s principle relates the pressure of a fluid to its elevation and its speed . Bernoulli’s equation can be used to approximate these parameters in water, air or any fluid that has very low viscosity.
Where is orifice meter used?
The orifice plate flow meter is commonly used in clean liquid, gas, and steam services . It is available for all pipe sizes but it is very cost-effective for measuring flows in larger ones (over 6′′ diameter). The orifice plate is also approved by many organizations for custody transfer of liquids and gases.
What does a Venturi meter do?
A venturi works by measuring the difference in pressure at two different locations . The pressure difference is created by reducing the diameter of the pipe causing the fluid to flow faster. The fast moving fluid has a lower pressure than the slower fluid in the larger section of the venturi.
What is the advantage and disadvantage of Venturi meter?
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.
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.
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.
