The principle of a venturi meter is depicted in figure 12. The coefficient of discharge c d for a venturi meter is in the region of 0. It is that portion of the venturi where the fluid gets converges. The objectives was to gain additional insight into low reynolds number flows in venturi meters. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Differential pressure type flow meters head flow meters measure flow rate by introducing a constriction in the flow. Determine the relationship between reynolds number and the coefficient of discharge. Orifice meter, installed on different pipes, arrangement of varying flow rate, u tube manometer, collecting tube tank, vernier calliper tube etc. A schematic of the venturi meter is shown on the diagram at the end of the procedure. Apr 26, 2015 15 venturi meter vs flow when a venturimeter is placed in a pipe carrying the fluid whose flow rate is to be measured, a pressure drop occurs between the entrance and throat of the venturimeter.
Differential pressure type flow meters head flow metersmeasure flow rate by introducing a constriction in the flow. Nov 16, 2017 this physics video tutorial provides a basic introduction into the venturi meter and how it works. Construction and specification of venturi meter venturi is an example for restriction type flow meter. A venturi meter is a device which is used for measuring the rate of flow of fluid through the pipe.
Introduction a venturi meter is a device for determining the flowrate of a fluid down a pipe. Determination of coefficient of discharge for venturimeter. Venturi meter apparatus with using venture meter, which is procured from tecquipment company, it is possible to see and measure the complete static head distribution along a horizontal venture tube, figure 1. The venturi flow meter consists of a streamlined contraction and a streamline expansion as shown the diagram. Experimental investigation of the installation effects on the venturi flow meter performance conference paper pdf available june 2000 with 2,477 reads how we measure reads. The venturi meter is invented by an american engineer clemans herchel 18411932 and named him after italian giovanni venturi 18421932.
Furthermore, still in the field of hydraulic experiment, a scientists called venturi after 7000 ad discovered a venturi meter. The orifice meter consists of a flat orifice plate with a circular hole drilled in it. A venturi meter is used to measure the flow rate through a tube. Figures 1 and 2 show the details of the apparatus for this experiment. It consists of flat circular plate which has a circular hole, in concentric with the pipe. Venturi meters have only a small head loss, no moving parts. A venturi meter is a variable head meter, which is used for measuring the flow rate of a fluid through a pipe. Venturimeter in a venturi meter there is first a converging section in which the cross sectional area. The experiment was carried out per the instructions outlined in the course manual. To determine the coefficient of discharge of the orifice meter 1. Ce 321 sample laboratory report packet this packet contains the following materials to help you prepare your lab reports in ce 321. He also observed that the meter was good for the study of fluid. One measures the pressure difference between the venturi inlet and neck, and from this the flowrate can be determined. Furthermore, it is hoped that the construction of larger sizes of venturi flumes than were tested in the laboratory will be encouraged thereby and that they can be calibrated.
To find the coefficient of discharge for orifice meter. Just like electromagnetic flow meter, it has no pressure drop head loss hence is very useful in places where pressure drop should be minimal and where a. Ce272 fluid mechanics sessional lab manual department of civil engineering ahsanullah university of science and technology. Objective the main objectives of this experiment is to obtain the coefficient of discharge from experimental data by utilizing venturi meter and, also the relationship between reynolds number and the coefficient of discharge. Video of a venturi meter used in a lab experiment idealized flow in a venturi tube the venturi effect is the reduction in fluid pressure that results when a fluid flows through a. The aim of this experiment is to study the overall meter coefficient c of venture meter and orifice plate. Venturi flow meter installation and operation manual designs, materials, weights and performance ratings are approximate and subject to change without notice. However due to a problem with the apparatus and a constantly fluctuating venturi meter, a camera was used to take a photo. As the fluid from the entry section of venturi meter flows into the converging section, its pressure keeps on reducing and attains a minimum value p2 when it enters the throat. He also noticed that the introduction of an orifice meter into a pipeline is necessary as this causes a change in the kinetic of the fluid. Fm 308 flow measurement by venturi and orifice meter. It consisted of a 21 conical contraction, a straight throat of diameter d and. This pressure drop is measured using a differential pressure sensor and when calibrated this pressure drop becomes a measure of flow rate. It is used to calculate the velocity of fluids in running through a pipeline.
Introduction there are many different meters used to measure fluid flow. The apparatus used on this experiment also has a number of straight tube manometers at equally spaced intervals. Venturimeter engineering explained engineeringclicks. The venturi meter is an obstruction meter named in honor of giovanni venturi 17461822, an italian physicist who first tested conical expansions and contractions. In simplest form, the pitot tube consists of a glass tube, bent at right. Predictionof discharge coefficient of venturimeter at low. Conclusion in this experiment cd the coefficient of. Pdf cfd analysis of flow through venturi tube and its discharge. Dimensions of the venturi used in the experiment as indicated in figure 3 below. Experimental investigation of the installation effects on the venturi flow meter performance. Department of mechanical engineering venturi meter objective. It may be noted that in the usual form of venturi meter intended for flow measurement, pressure tappings are made only at the entrance and at the throat, as these two readings suffice to measure the discharge. Venturi meter posted on march 15, 2011 april 4, 2012 by mrsoltys a venturi meter is a device that allows flow rates through pipes to be calculated by measuring the difference in pressure created by a contraction in a pipe.
Cd for the venturi meter decreased as the flow rate decreased with each trial. There is a pressure tap upstream from the orifice plate and another just downstream. Department of mechanical engineering venturi meter. Energy losses through venturi, orifice, and rotameter flowmeters. Pdf experimental investigation of the installation effects. The major objective of this experiment was to construct, test and model a simple, inexpensive venturi meter.
Fm 308 flow measurement by venturi and orifice meter objectives. Figure 1 venturi meter h5 the venturi meter has three main. To find the water flow rate using the venturi meter and the pressure distribution along the meter. Its value varies slightly from one meter to another, and, even for a given meter it may vary slightly. To find the coefficient of discharge of an orifice meter. When comparing the reynolds number to cd for the venturi meter the graph remained relatively linear until there was a drastic. It is a cheaper device as compared to venturimeter. Venturimeter is the most widely used device to measure the discharge through the pipe.
Pdf flow through a venturi meter orifice rotameter emmanuel. A venturimeter is a device used for measuring the rate of a flow of a fluid flowing through a pipe. A venturi is a convergingdiverging nozzle of circular crosssection. It is one of the most accurate means of measuring the flow. Seminar assignments, questions and answers lab experiment no. Pdf experimental investigation of the installation effects on the. The inlet diameter equals d 26 mm and the throat diameter d 16 mm.
Pdf venturi tube plays a very important role in different fields of engineering. It is the portion that lies in between the converging and diverging part of the venturi. Pdf flow through a venturi meter orifice rotameter. Graf 1967 carried out an experiment on venturimeter to modify it for. Energy losses through venturi, orifice, and rotameter. Flow through venturi meter background and theory introduction flow meters are used in the industry to measure the volumetric flow rate of fluids. A venturi meter is basically a type of flow meter with a specially designed tube, used to measure the flow velocity of liquids especially highly viscous liquids.
The whole assembly of venturi meter, manometer tubes, scale and manifold is supported on a base mounted on adjustable screwed feet. Venturi meter is a device or component which is used for measuring the rate. This also work on the same principle as that of venturimeter. The venturi meter, also known as venturi tube, belongs to the category of variable head flowmeters. The original, or classical, venturi was invented by a u. Fm 308 flow measurement by venturi and orifice meter chemical. This type of a venturi meter is also known as the herschel type and it consists of a smooth gradual contraction from the main pipe size to the throat section, followed by a smooth. Introduction the orifice meter, the nozzle meter, and the venturi meter are the most common devices used to. The purpose of the experiment is to demonstrate typical flow measurement. Experiment 1 experiment 1 flow through a venturi meter. Flow through venturi meter background and theory introduction flow meters are used in the industry to measure the volumetric flow rate of fluids of the modern venturi meter in 1886 by clemons herschel.
In venturi tubes, pressure loss is low and viscosity effect is high. The restriction diameter should not be less than 0. Pdf effect of geometrical parameters of venturimeter on. A venturi tube contains a throat which is smaller in a diameter to the pipeline, into which it fits. In addition, cfd modeling was conducted to to simulate laminar flow in a venturi meter. Definition, parts, working, derivation, applications. Venturi flow meter working principle animation when a venturi flow meter is placed in a pipe carrying the fluid whose flow rate is to be measured, a pressure drop occurs between the entrance and throat of the venturi meter. In venturi, pressure energy pe converted into kinetic energy ke to calculate flow rate discharge in a closed pipeline.
Venturi meterconstruction, working, equation, application. If you continue browsing the site, you agree to the use of cookies on this website. Detailed information about these components is given in this chapter. The standard deviation, for cd was also calculated to be. Experimental and cfd analysis of flow through venturimeter to. In this experiment the flow k and discharge cd coefficients of a venturi meter will be assessed by comparing the real discharge measured in the experiment with the theoretical discharge calculated by deriving venturi discharge formula from bernoulli and continuity equations. There are many different meters used to measure fluid flow. The meter consists of a pipe with a narrowing throat that expands back to its original diameter on the other side of the choke point. Differential pressure type flow meters head flow meters measure flow rate by introducing a constriction in. Flow through a venturi meter summary this experiment familiarized students with measuring pressure using manometers and the theories and calculations of around it. In industrial applications the knowledge of this effect is used to predict how a fluid will react when flowing through various stages of constricted pipes. The principle of the orifice meter is identical with that of the venturi meter. The venturimeter is an obstruction type flow meter named in honor of giovanni venturi 174611822, an italian.
Venturi meter problems, bernollis principle, equation of. Water from the hydraulic bench enters the equipment through a venturi meter. The fluid whose flow rate is to be measured enters the entry section of the venturi meter with a pressure p1. A venturi meter is also called a venturi flowmeter. A venturimeter or current meter is used to calculate the change in flow rate through a choked tube as described by the bernoulli equation.
A simple, inexpensive venturi experiment applying the. In this meter, the fluid is gradually accelerated to a throat and then gradually retarded in diverging section where the flow channel expands to the pipe size. The initial cost of a venturi meter the classical venturi is limited in its application the beta ratio of a vcone is so defined that an orifice and a v 20150302 venturi meter experiment applications of bernoullis principle is venturimeter and orifice meter diagram and explaination in. Pressure recovery for venturi tubes is a lot better as compared to the orifice plates. The main objectives of this experiment is to obtain. Venturi tubes are appropriate for clean, dirty and viscous liquid and few slurry services as well.
Calculate the coefficient of discharge from experimental data for a venturi meter. To find the coefficient of discharge for venturi meter. Its a device used to measure the velocity of a fluid in a tube. Venturi flow meter installation and operation manual. The venturi meter has a converging conical inlet, a cylindrical throat and a diverging. To determine the coefficient of discharge of the venturimeter 2. Using bernoullis equation, pressure and flow rate were calculated, and static and dynamic pressure were identified. Venturi meter and orifice meter are the commonly used flow meters for measuring massvolumetric flow rate or velocity of the flowing fluid. An annotated sample lab report prepared on a fluids experiment. Venturi meter is a device or component which is used for measuring the rate of flow of liquid through pipes. A wide variety of venturi meter options are available to you, there are 302 suppliers who sells venturi meter on, mainly located in asia. It is based on the use of the venturi effect, the reduction of fluid pressure that results when a fluid runs through a constricted. Definition, parts, working principle, derivation, applications with pdf.
Seminar assignments, questions and answers lab experiment. Pdf the sensitivity of flow meters to their operational conditions continues. Jan 17, 2018 basics of differential flow devices venturi tubes, orifice plates, and flow nozzles duration. Venturi flume for measuring water in open channels, in order that those in practical need of such a device may know of its existence. The pressure along the meter is obtained using the 11 pressure taps at the locations shown on the diagram. If the velocity at any point decreases, the pressure at that point increases due to the conservation of the kinetic energy into pressure energy.
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