# Difference Between Orifice And Venturi Meter Pdf

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Venturimeter and orifice meter. The throat and the inlet has been connected to mercurymanometer for the pressure readings. This helps us find out the velocity at the various cross sections and. Open the control valve of venturimeter Switch on the main power supply. Switch on the pump.

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Venturimeter and orifice meter. The throat and the inlet has been connected to mercurymanometer for the pressure readings. This helps us find out the velocity at the various cross sections and. Open the control valve of venturimeter Switch on the main power supply. Switch on the pump. Regulate flow of water through venturimeter with the help of given flow control valve.

Remove the water bubble from the tube connecting manometer if any. Measure the pressure difference between two sections in the venturimeter using mercury manometer.

Repeat the experiment for different flow rates. Repeat the whole experiment for the flow through orifice meter. When experiment is over, Switch off Pump and Power Supply. Drain water from sump tanks with the help of given drain valve. Due to use of stop watch manual errors in timings are introduced.

Mercury lining was not completely visible. Coefficient of discharge for venturimeter was found to be 0. Log in Get Started. Download for free Report this document. Embed Size px x x x x Apparatus Venturimeter and orifice meter. Sump tank Measuring tank Pump to circulate the water Stopwatch Theory venturimeter In the upstream cone of the Venturi meter, velocity is increased, pressure is decreased.

Pressure drop in the upstream cone is utilized to measure the rate of flow through the instrument. Velocity is then decreased and pressure is largely recovered in the downstream cone. According to Bernoullis theorem the sum of pressure head and velocity head remains constant along a streamline. This helps us find out the velocity at the various cross sections and hence discharge coefficient. Let the cross sectional areas, velocities and pressures at the two points be a1, a2, v1, v2, p1andp2 respectively.

We can now write two equations i. We can calculate Qexperimental from stopwatch and volume of fluid. The same calculation process can be carried out for orifice meter. Errors Due to use of stop watch manual errors in timings are introduced. Conclusion Coefficient of discharge for venturimeter was found to be 0.

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The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section or choke of a pipe. The Venturi effect is named after its discoverer, Giovanni Battista Venturi. In inviscid fluid dynamics , an incompressible fluid's velocity must increase as it passes through a constriction in accord with the principle of mass continuity , while its static pressure must decrease in accord with the principle of conservation of mechanical energy Bernoulli's principle. Thus, any gain in kinetic energy a fluid may attain by its increased velocity through a constriction is balanced by a drop in pressure. By measuring pressure, the flow rate can be determined, as in various flow measurement devices such as Venturi meters, Venturi nozzles and orifice plates. Referring to the adjacent diagram, using Bernoulli's equation in the special case of steady, incompressible, inviscid flows such as the flow of water or other liquid, or low speed flow of gas along a streamline, the theoretical pressure drop at the constriction is given by:.

Performance of rotating machines such as Pelton turbines, centrifugal fans and hydrostatic transmissions. Be it electrical testing equipment such as centrifuges and sterilisers or scales and balances, the technicians at HK Calibration Technologies Pty Ltd HKCT can help ensure your tools and your facilities are performing in peak condition. Pitot tubes are used to measure the velocity of a fluid moving through a pipe by taking advantage of the fact that the velocity at the height of the bend in the tube stagnation point is zero. The upstream pipe area is 0. Pitot Tubes or Differential Pressure Sensor for Liquids and Gases The pitot tubes offer the following advantages easy, low-cost installation, much lower permanent pressure loss, low maintenance and good resistance to wear.

has a precisely measured hole.

## Orifice plate

Venturi vs Orifice. Orifice meters and Venturi meters are devices that are used to measure the pressure of flow of fluids. Both of them are differential pressure flow meters and work by placing a constriction in the flow of liquid. As fluid passes this constriction, its velocity increases according to Bernoulli Equation, which says that as elevation cannot change in a pipe, if the pressure decreases, the velocity of flowing fluid inside a pipe increases. This principle is used both in Venturi as well as orifice meters.

An orifice meter is a piece of equipment used to measure the flow rate of a gas or a fluid. It mainly consists of an orifice plate, an orifice plate housing, and a meter tube. At Aspire Energy Resources Inc.

### Flow measurement: pitot tube, venturi meter and orifice meter

The term pipe flow rate is often used to refer to flow rate for any closed conduit flow under pressure. The closed conduit is often circular, but may also be square or rectangular, such as a heating duct. The other major category of flow is open channel flow, which occurs when there is a free liquid surface open to atmospheric pressure. Pipe flow measurement is often done with a differential pressure flow meter like the orifice, flow nozzle, and ventruri meter, which are discussed in this article. An Excel spreadsheet works well for differential flow meter calculations.

Flow is defined as the rate volume or area per unit time at which a substance travels through a given cross section and is characterized at specific temperatures and pressures. The instruments used to measure flow are termed flow meters. The main components of a flow meter include the sensor, signal processor and transmitter. Flow sensors use acoustic waves and electromagnetic fields to measure the flow through a given area via physical quantities, such as acceleration, frequency, pressure and volume.

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#### Construction of an Orifice Meter

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. An orifice plate is a thin plate with a hole in it, which is usually placed in a pipe. When a fluid whether liquid or gaseous passes through the orifice, its pressure builds up slightly upstream of the orifice [1] but as the fluid is forced to converge to pass through the hole, the velocity increases and the fluid pressure decreases. A little downstream of the orifice the flow reaches its point of maximum convergence, the vena contracta see drawing to the right where the velocity reaches its maximum and the pressure reaches its minimum. Beyond that, the flow expands, the velocity falls and the pressure increases. By measuring the difference in fluid pressure across tappings upstream and downstream of the plate, the flow rate can be obtained from Bernoulli's equation using coefficients established from extensive research. Orifice plates are most commonly used to measure flow rates in pipes, when the fluid is single-phase rather than being a mixture of gases and liquids, or of liquids and solids and well-mixed, the flow is continuous rather than pulsating, the fluid occupies the entire pipe precluding silt or trapped gas , the flow profile is even and well-developed and the fluid and flow rate meet certain other conditions.

Very good presentation, it is in detail no doubt. Please keep on writing such kind of beautiful articles. Very easy Language it's comparision, Thank you for helping web Share your reading experience here. Flow is one of the crucial process variables that is needed to be measured, transmitted, manipulated and controlled in order to ensure safety and success of a given process in process control ind ustr ies. Orifice plates and venturimeters are the two most widely used flow meters in industries for flow measurement.

The pipe cross-sectional area is reduced to create a pressure difference which is measured with a manometer to determine the rate of fluid flow. So, the venturi meter is a differential head type flowmeter. The principle of the Venturimeter was demonstrated by Giovanni Batista Venturi Hence the name Venturimeter , But it was first used in practical metering applications by Clemens Herschel. In this article, we will explore the parts, working principles, equations, and applications of Venturimeter. Small-size venturimeter are made of brass, glass, or bronze and large venturimeters are made of cast iron, steel, or stainless steel. When a fluid flows through a venturimeter, it accelerates in the convergent section and then decelerates in the divergent section. The pressure difference between an upstream section and throat is measured by a manometer.

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Very good presentation, it is in detail no doubt. Please keep on writing such kind of beautiful articles. Very easy Language it's comparision, Thank you for helping web

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