See details of the equation that applies to all three and gives flow rate as a. The cross section of the throat is much less than the cross. The main objectives of this experiment is to obtain. This also work on the same principle as that of venturimeter. Readings taken are time taken for 100 mm rise in water level in the measuring tank. An orifice meter consists of a flat plate that has a sharpedged hole accurately machined in it and placed concentrically in a pipe as shown in figure 12.
For measurement through venturi, open the outlet valve of the venturi meter. Venturi meter being a measuring instruction was used in determining the flow rate of fluid down a pipe or the rate of discharge in a pipeline and is often fixed permanently at different sections of the piple line to know the discharge there. Check whether the water level in the main tank is sufficient for the suction pipe of pump to be completely immersed. Introduction there are many different meters used to measure fluid flow. Department of mechanical engineering venturi meter objective. Venturimeter principle, construction and working with. Jul 01, 2011 a venturi meter constricts the flow of fluid and the pressure differential is measure using pressure sensors before and within the constriction. The fluid is then retarded in a cone of smaller angle 57o in which. Which of the following flowmeasuring elements is inherently linear and requires no signal characterization e. Determination of coefficient of discharge for venturimeter. The first recorded use of an orifice device for fluid measurement was in 1797 by giovanni b. It can also be applied to real incompressible fluids with good results in situations where frictional effect is very small. This orifice plate creates a measurable pressure difference between its upstream and downstream sides. Nov 20, 2016 venturi meter and orifice plate lab report venturi meter and orifice plate effects are two main and very important phenomenas in fuild mechanics sub field of mechanical engineering.
Venturi meter and orifice meter venturimeter in this meter the fluid is accelerated by its passage through a converging cone of angle 1520o. Advantages of venturimeter disadvantages of venturimeter. The inlet section is a standard asme longradius nozzle with a throat diameter dv of 0. In order to use any of these devices for measurement it is necessary to empirically calibrate them. Both venturis and orifice plates are used in industrial applications and in scientific laboratories for measuring the flow rate of liquids. Venturimeter principle, construction and working with diagram june 24, 2016 march 4, 2018 pankaj mishra 0 comments fluid mechanics. Venturi meter and orifice meter dynamics mechanics civil.
Venturi meter and orifice meter are the commonly used flow meters for measuring massvolumetric flow rate or velocity of the flowing fluid. Pipe lines, each line fitted with a venture meter and orifice meter of size 25 mm with a gate valve and provided with a set of distribution chamber having isolating cocks to facilitate experiment on individual venture meter or orifice. Venturi meter, orifice meter, and pitot tube are widely used head flow meters in the industry. Flow measurement multiple choice questions and answers. A nozzle, venturi or thin sharp edged orifice can be used as the flow restriction. To find the water flow rate using the venturi meter and the pressure distribution along the meter. Discharge coefficient performance of venturi, standard.
An orifice meter is a conduit and a restriction to create a pressure drop. Pipe flow measurement with a differential pressure flow meter. It is that portion of the venturi where the fluid gets converges. Venturimeter it is a device used for the measurement of flow in a pipeline. A venturi can also be used to mix a liquid with a gas. Fm 308 flow measurement by venturi and orifice meter chemical. The standard orifice plate does not follow the general trend in the discharge coefficient curve that the other flow meters do. In simple language, this is defined as the sum of pressure energy, kinetic energy per unit volume and potential energy per unit volume equal in the same. Bsen 3310 lab 2calibration of orifice flow meter and venturi. To find the coefficient of discharge for venturi meter. A venturi is a convergingdiverging nozzle of circular crosssection. Fm 308 flow measurement by venturi and orifice meter. Energy losses through venturi, orifice, and rotameter flowmeters. Venturimeter principle, construction and working with diagram.
Flow measurementorifice meter fluid mechanics coursera. The venturi meter has a converging conical inlet, a cylindrical throat and a diverging recovery cone fig. In comparison of venturimeter with the orifice meter, the pressure recovery is much better for venturimeter than for the orifice plate, but there is no complete pressure recovery. Orifice plate is similar in the sense that it make use of a plate with a small hole in between to place restriction in the passage of the fluid. It can be installed in any direction between pipe flow i.
A venturi meter constricts the flow of fluid and the pressure differential is measure using pressure sensors before and within the constriction. It is a cheaper device as compared to venturimeter. Venturi meter presents a costlier method to measure the rate flow of fluid through the pipe. Menunjukkan pengaruh perubahan penampang terhadap tinggi garis hidraulik pada masingmasing manometer. Plot results from both flow rates on the same graph. Application of bernoullis law orifice meter venturi meter 6. Whereas the flow through venturimeter results into a pressure difference between the inlet and the throat, in the case of orificemeter there is a pres sure difference. Venturi meter and orifice meter free download as pdf file.
Venturi meter and orifice meter venturimeter in this meter the fluid is accelerated by its passage through a converging cone of angle 15, venturi meters are flow measurement instruments the venturi meter has an advantage over the orifice orifice plates, nozzles and venturi tubes inserted in. In this post the effect of venturi meter and orifice plate on the fluid flow will be disciussed and complete work will be presented in the form of report. A target b venturi c orifice plate d pitot tube e turbine. Ansery orifice meter it may be installed in pipeline with a minimum of trouble and expense orifice meter orifice meter. A free powerpoint ppt presentation displayed as a flash slide show on id. Experimental and cfd analysis of flow through venturimeter to. This is done by creating a smaller diameter at a certain point in the pipe. Venturi, an italian physicist whose work led to the development of the modern venturi meter in 1886 by clemons herschel.
Experimental and cfd analysis of flow through venturimeter. If a pump forces the liquid through a tube connected to a system consisting of a venturi to increase the liquid speed the diameter decreases, a short piece of tube with a small hole in it, and last a venturi that decreases speed so the pipe gets wider again, the gas will be sucked in through the small hole because of changes in pressure. Determination of coefficient of discharge for venturimeter fluid practicals. 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.
A venturi meter is a variable head meter, which is used for measuring the flow rate of a fluid through a pipe. Energy losses are less in a venturi meter whereas energy losses. Discharge equations for venturimeter and orificemeter. The major drawback of the venture meter is we cannot use it for small diameter size pipe. Pressure recovery is measured as the pressure difference between inlet and outlet.
The pressure difference between the upstream end if the cone and the throat are measured and provide the signal for the rate of flow. The theory is the same as for the orifice meter but a much higher proportion of the pressure drop is recoverable than is the case with orifice meters. However, the same principle can be exploited with only minimal pressure loss with the use of a venturi meter. Pipe flow measurement with a differential pressure flow. In 1890, it has been reported that an orifice meter designed by professor s.
In the previous programme we saw that the relationship between the pressure p, the velocity u and the elevation z of a flowing fluid is given by bernoullis equation. Like the venturi meter, the pressure difference varies directly with the flow rate. In this post the effect of venturi meter and orifice plate on the fluid flow will be disciussed and. Menentukan koefisien pengaliran pada alat venturimeter yang digunakan. Calibration of orifice flow meter and venturi flow meter d. So this type of flow meter experiences lesser pressure drop as compared to that of the orifice. Till abstract orifice and venturi flow meters decrease the pressure of a fluid by increasing its velocity as it flows through them. All three use a constriction in the flow path like an orifice plate to cause a pressure drop across the meter that can be measured and correlated with flow rate. 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. The expanding section of venturi meter returns the flow near to its original pressure. A venturimeter is a device used for measuring the rate of flow of a fluid flowing through a pipe.
Note that there is provision for user input to select either u. The orifice meter valve is closed completely and for the venturimeter, the desired flow in supply and calibration line is achieved by control valves in supply line, calibration line and pump bypass line 4. Orifice meter presents a cheaper method to measure the rate of flow through the pipe. A venturimeter is a device used for measuring the rate of a flow of a fluid flowing through a pipe. This implies that the curves accurately represent the data points. Venturimeter has high accuracy as compare to other flow measuring devices like orifice meter, pitot tube and nozzles. It is the portion that lies in between the converging and diverging part of the venturi. Venturimeter has some disadvantages also like, it has high initial cost because its calculation is very complicated. It uses the same principle as a venturi nozzle, namely bernoullis principle which states that there is a. Difference between venturi and orifice compare the.
Bsen 3310 lab 2calibration of orifice flow meter and. Predictionof discharge coefficient of venturimeter at low. The venturi effect is the reduction in fluid pressure that results when a fluid flows through a. Schematic diagram for venturimeter and orifice meter a.
The size of the venturimeter is expressed in inlet and throat diameter form. As liquid flows through the pipe, the flow suddenly contracts as it approaches the orifice and then suddenly expands after the orifice back to the full pipe diameter. The venturi flow meter consists of a streamlined contraction and a streamline expansion as shown the diagram. In this meter the fluid is accelerated by its passage through a converging cone of angle 15. The gradual approach to and the gradual exit from the orifice substantially eliminates boundary layer separation. To determine the coefficient of discharge of the orifice meter 1. Jul 08, 2015 application of bernoullis law orifice meter venturi meter 6. Jun 24, 2016 a venturimeter is a device used for measuring the rate of flow of a fluid flowing through a pipe. The orifice meter is constructed as shown in figure 5. It works on the basic principle of bernoullis equation. Pdf discharge equations for venturimeter and orificemeter. Fundamentals of orifice meter measurement this white paper provides an overview of orifice meter technology, its advantages and general installation recommendations, as well as describes basic gas flow laws and the variables of orifice meter flow equations.
It consists of flat circular plate which has a circular hole, in concentric with the pipe. Venturi meter is a device or component which is used for measuring the rate of flow of liquid through pipes. As per iso 51671 3, the mass flow rate in a venturimeter q m is given by. The orifice flow meter, flow nozzle meter, and venturi meter are three commonly used types of differential pressure meter for pipe flow measurement. Venturi meter a cross section of the brass venturi meter tested is shown in figure 3. Venturimeter can be used for the measurement of flow of water, liquids, gases, dirty liquids etc. Venturimeter is the most widely used device to measure the discharge through the pipe. Application of orifice meter for accurate gas flow measurement techwpaper download as pdf file.
The working of venturimeter is based on the principle of bernoullis equation. Venturi meterconstruction, working, equation, application. The project was on the construction of a venturi meter. The main advantage of venturimeter is it has very less losses and high accuracy. Pdf using experimental curves for the discharge coefficients of venturimeter or orificemeter, the pipe discharge is obtained iteratively. One of the disadvantages of orifice meters is the large irreversible pressure loss across the orifice, which results in substantial pumping costs in case of large diameter pipes. Head loss coefficient of orifice plate energy dissipator. Venturimeter is used to measure the rate of flow through a pipe. Calibration of an orifice plate flowmeter mechanical engineering department king saud university riyadh submitted by. Venturimeter consists of a converging portion, throat and a diverging portion. Flow through venturi meter background and theory introduction. It consists of flat circular plate which has a circular hole. That is, pass a known volume through the meter and.
Venturimeter and orificemeter apparatus make labtek, origin india piping system. Jun 01, 2018 orifice plate and orifice meter workingtypes of orifice plates flow measurement by orifice meter duration. Jan 24, 2018 for the love of physics walter lewin may 16, 2011 duration. Fm 308 flow measurement by venturi and orifice meter objectives. 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. Jun 05, 2018 venturimeter has high accuracy as compare to other flow measuring devices like orifice meter, pitot tube and nozzles. What is the difference between venturimeter and orificemeter. A spreadsheet to assist with orificeventuriflow nozzle meter calculations and iso 5167 calculation of an orifice coefficient is also provided. Unlike the orifice meter, the fluid jet after passing through the restriction throat of venturi expands to a large area gradually. Energy losses through venturi, orifice, and rotameter. In the previous programme we saw that the relationship between the pressure p, the velocity u and the elevation z of a flowing fluid is given by bernoullis. To find the coefficient of discharge for orifice meter. Several graphs demonstrating the varying relationships and. Apr 03, 2020 venturi meter is a device or component which is used for measuring the rate of flow of liquid through pipes.
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