Venturi meters are flow measurement instruments which use a converging section of pipe to give an increase in the flow velocity and a corresponding pressure drop from which the flowrate can be deduced. They have been in common use for many years, especially in the water supply industry.

What is venturi meter used for?

A venturi meter is also called a venturi flowmeter. It is used to calculate the velocity of fluids in running through a pipeline. The fluid may be a liquid or a gas. The meter consists of a pipe with a narrowing throat that expands back to it's original diameter on the other side of the choke point.

What is a venturi device?

A Venturi is a system for speeding the flow of the fluid, by constricting it in a cone shape tube. In the restriction the fluid must increase its velocity reducing its pressure and producing a partial vacuum. As the fluid leave the constriction, its pressure increase back to the ambient or pipe level.

What is a venturi meter and how does it work?

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 measured using Venturimeter?

Answer: Venturimeter is a device used to measure the rate of flow of fluid flowing through a pipe. Venturimeter is a device which is used for measuring the rate of flow of fluid flowing through a pipe.

Venturimeter- Construction, Working, Applications, Adavantages & Disadvantages.

23 related questions found

What are the parts of Venturi meter?

A venturimeter consists of four parts:

• Cylindrical Inlet Section.
• Conical convergent Section.
• Cylindrical throat and.
• Conical divergent outlet.

How does a Venturi meter measure flow?

A Venturi meter is used to measure the flow rate through a tube. It is based on the use of the Venturi effect, the reduction of fluid pressure that results when a fluid runs through a constricted section of pipe. ... - as a result the two meters indicate the difference in pressure by means of a height difference h.

What is the difference between Orificemeter and venturimeter?

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. The difference between venturi meter and orifice meter are: ... The coefficient of discharge in the venturi meter is 0.98 while in orifice meter it is 0.6.

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 is throat of venturimeter?

Construction: A venturimeter is essentially a short pipe (Fig. 15.1) consisting of two conical parts with a short portion of uniform cross-section in between. This short portion has the minimum area and is known as the throat.

Is a Venturi a pump?

How does the Venturi System Work? ... A Venturi vacuum is created by a pump with compressed air running through it, yet the pump has no moving parts. Compressed air runs through the initial chamber, then a smaller portal that opens into another larger chamber, which is like the first one.

What is Venturi injector?

Mazzei® venturi injectors are differential pressure injectors with internal mixing vanes. The unique, patented design and precision construction of Mazzei injectors maximizes injector efficiency, suction capacity and mixing capabilities.

What is a Venturi fitting?

The Taco Venturi Fittings are designed to divert water flow from a given zone to the by-pass loop. ... The Venturi Fitting creates a differential pressure that makes some of the flow want to divert through the by-pass and back to the zone. The Taco Venturi Fitting can be used in upfeed or downfeed applications.

What are the types of flow?

There are Six different types of fluid flow:

Uniform and Non-Uniform. Laminar and Turbulent. Compressible and In-compressible. Rotational and Ir-rotational and.

Which is more accurate Venturimeter and Orificemeter?

For measuring mass flow rate of liquid flowing inside tube, venturimeter is the most accurate device. Since experimental measurement by venturimeter is 0.96-0.99 times theoretical measurement. Next comes, orifice meter which is 0.6- 0.62 times theoretical measurement.

What is frictional factor?

Definition of friction factor

The friction factor is representing the loss of pressure of a fluid in a pipe due to the interactions in between the fluid and the pipe. f/2=friction factor - fanning. D=Pipe diameter in m. u_m=mean velocity in m/s.

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 CD of Venturi meter?

Coefficient of discharge is the ratio of actual discharge to the theoretical discharge. Coefficient of discharge. ⇒ Venturimeter – 0.95 to 0.98. ⇒ Orifice meter – 0.62 to 0.65. ⇒ Nozzle meter – 0.93 to 0.98.

What is the basic principle of Venturi meter?

The principle of venturimeter is that when a fluid flows through the venturimeter, it accelerates in the convergent section and decelerates in the divergent section, resulting in a drop in the static pressure followed by a pressure recovery in the flow direction.

What is the difference between pitot tube and Venturimeter?

What is the difference between pitot tube and Venturimeter? ... The venturi meter takes advantage of a constriction to change the speed of fluid flow, thus changing the dynamic pressure. The pitot meter also measures flow speed, but it forces the fluid to reach a stagnation point and abruptly change flow direction.

What is the difference between orifice and mouthpiece?

An Orifice is a small opening of cross-section that is present on the side at the bottom of the tank. A mouthpiece is a short length of a pipe which is 2-3 times its diameter in length and is fitted in a tank or vessel that contains the fluid.

Why Cd value is high in Venturi 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 ...

Where in the Venturi meter is the pressure the highest?

The static pressure in the first measuring tube (1) is higher than at the second (2), and the fluid speed at "1" is lower than at "2", because the cross-sectional area at "1" is greater than at "2".

What is the use of manometer?

A manometer is a device that we use to measure the pressure of the pipelines (cab be of gas, water, liquid, etc.) Also, it is usually referred to as a U-shaped tube that is filled with a liquid.

What is hydraulic grade line?

The surface or profile of water flowing in an open channel or a pipe flowing partially full. If a pipe is under pressure, the hydraulic grade line is that level water would rise to in a small, vertical tube connected to the pipe.