Flow measurement with long throated flumes under uncertain. Bsen 3310 lab 2calibration of orifice flow meter and. Discharge coefficient performance of venturi, standard. It basically works on the principle of bernoullis theorem. Jan 27, 2017 deplete the water from measuring tank after the completion of the experiment. Measurement of flow rate, velocity profile and friction. To calibrate the given ori ce meter and to determine the variation of coe cient of discharge over reynolds number. Amenities for creating standardized flows are necessary for flow meter calibration. Another method is to produce a constriction in a vessel by means of a ligature near a branch, which can be used as a side tube, thus transforming the vessel itself into a venturi meter.
The system consists of a pipe of several meters plumbed in series. Experimental and cfd analysis of flow through venturimeter. The nozzle type is a compromise between the other two. The meters are mounted in a series of pipes through which water will be circulated. The water flow rate can be adjusted using the valves on the hydraulics bench. Close the discharge valve of the collection tank and measure the. To determine the coefficient of discharge of the venturimeter 2. Diameter of the pipe 1 inch diameter of the throat.
The measured alteration is then related to the flow. One, the venturi meter, is a device used for measuring the rate of flow of a fluid through a pipe. In experiment 1, during calibration of a rotameter, venturimeter experiment the following data is recorded. Of the three types the venturi meter is the most expensive but gives the least overall pressure loss. When the basic flow input is accessed via the determination of time and either linear dimension, which is volumetric flow, the process is known as primary calibration. The calibration graph qa vs h hg can be illustrated. The pressure drop in orifice meter and nozzles are significantly higher than the venture meters.
Nov 20, 2016 venturi meter and orifice plate effects are two main and very important phenomenas in fuild mechanics sub field of mechanical engineering. Flow rate of water is measured with the help of measuring tank and stop watch. Bsen 3310 lab 2calibration of orifice flow meter and venturi. Differential pressure type flow meters head flow meters measure flow rate by introducing a constriction in. Ceng 0320 unit operations laboratory i meng 0412 thermal sciences laboratory 7 expt. In the industrial sector, it is used to determine the pressure as well of the quantity of gas and liquid inside a pipe. Flow rate equation for venturi and orifice with discharge coefficient. Calibration of orifice flow meter and venturi flow meter dustin a. Coefficient of discharge for an orifice, flow nozzle none or venturi meter. The flow through venturi meter can calculated from the following equation. Introduction flow meters are used in the industry to measure the volumetric ow rate of uids. A venturi meter is a device for determining fluid velocities based on the pressure. Record the pressure difference in the manometer connected between the upstream side and the throat of the venturi meter. This is done by creating a smaller diameter at a certain point in the pipe.
Cavitation in a venturi h400 fluid mechanics tecquipment. Bench enters the equipment through a venturi meter, which consists of a. Introductionthere are many different meters used to measure fluid flow. Orifice and venturi flow meters decrease the pressure of a fluid by increasing its. Flow through venturi meter background and theory introduction flow meters are used in the industry to measure the volumetric flow rate of fluids. Pdf orifice meters are mechanical devices used to measure gases and liquids flows. Pdf numerical methodology for orifice meter calibration. Calibration of venturimeter flow measurement fluid dynamics. Keep the delivery valve closed and manometer valve at open open position.
This method requires an anticoagulant, but is accurate and sensitive to slight changes in flow. Experiment 8 flow measurements philadelphia university. The nozzle flow meter included or any of the optional flow meters quickly and easily fit into place between the adaptors in the base unit of the apparatus. A venturi meter may also be used to increase the velocity of any type fluid in a pipe at any particular point. Determination of coefficient of discharge through venturimeter procedure. Calibration rig at venturi calibration services is supplied by 150. Recovery of pressure drop in orifices, nozzles and venturi meters. Water is allowed to flow through the meter at different rates ranging from zero to the maximum and the corresponding pressure differences shown in the manometer are. The venturi flow meter obtains a pressure differential by constricting the flow area and therefore increasing the. Objectives the objectives of this experiment were to gain knowledge on pressure and flow measuring devices, and to calibrate an orifice flow meter and a venturi meter. Yamamoto department of chemical engineering, college of engineering and architecture, cebu institute of technology university n.
However, for smaller pipes orifice meter is a suitable choice. Applying bernoullis equation to points and of the venturi. 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. It is a cheaper device as compared to venturimeter. Jun 04, 2010 this experiment will introduce you to two devices that are used to measure flow. Introduction the venturi meter is an obstruction meter named in honor of giovanni venturi 17461822, an italian physicist who first tested conical expansions and contractions. More specifically, this simple venturi meter, constructed from materials available at a local hardwareauto parts store, was characterized by determining the venturi coefficient and the permanent pressure loss. Plot the given graph log q a vs log h hg, y intercept symbolizinglog k and slope symbolizes n. Adjust the inlet gate valve and bypass valve to get the steady ow across the venturi meter 4. Venturi calibration services calibration rig is used to test flow meter with diameter from 80 mm to 1. Venturi meter a venturi can also be liquid flow rate measurement venturi flume flowbox liquid flow rate measurement venturi orifice and venturi meter prelab pdf free download april 4th, 2019 objectives the main objective of the experiment is to determine discharge coefficient for both the venturi meter and the orifice meter at varying va rying. The venturi meter is a flow meter that used where highpressure recovery is required. Calibration of orifice flow meter and venturi flow meter d. The main advantages of the venturi over the orifice plate are.
It uses the same principle as a venturi nozzle, namely bernoullis principle which states that there is a. Venturimeter in a venturi meter there is first a converging section in which the cross sectional area. Four different types of differential pressure flow meters were studied which include. This also work on the same principle as that of venturimeter.
In experiment 1, during calibration of a rotameter. It consists of a short converging pipe and gently diverging part called the diffuser. Venturi causes less overall pressure loss in a system and thus saves energy. The venturi flow meter obtains a pressure differential by constricting the flow area and therefore increasing the velocity at the constriction, which creates a. Each meter works by its ability to alter a certain physical property of the flowing fluid and then allows this alteration to be measured. To determine the coefficient of discharged through venturi meter and orificemeter.
Flow control valve and bypass valve are fitted in water line to conduct the experiment on different flow rate. Venturimeter experiment ecv208 ku venturimeter experiment. The objectives of this experiment were to gain knowledge on pressure and. It is invented by american engineer clemans herchel and named by the italian physicist giovanni venturi. Solteq flowmeter measurement apparatus fm101 page 3 3.
A schematic of the venturi meter is shown on the diagram at the end of the procedure. Experimental and cfd analysis of flow through venturimeter to. The rig is used to obtain the accuracy of each flow meter by comparing its measurement performance against a known value which is provided by a reference device such as a weight tank or master flow meter. One method is by inserting an accurately calibrated venturi meter made of glass into the circulation. This manual contains complete experiment instructions, including several options for fluid supply and flowrate measurement. A simple, inexpensive venturi experiment applying the. The two sections are joined by a constriction that is commonly referred to as the throat. If the velocity at any point decreases, the pressure at that point increases due to the conservation of the kinetic energy into pressure energy. The inlet diameter equals d 26 mm and the throat diameter d 16 mm.
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. Calibrate a venturi meter, determine experimental c v, and compare the experimental c v value to the literature c v value 3. In simplest form, the pitot tube consists of a glass tube, bent at right. The arrangement of orifice meter is much economical than the use of the venturi meter, but as seen in this experiment the venturi meter provide more accurate results that the orifice meter, so the choice of which to use in a specified laboratory depends on the financial ability of the organization occupying the device and on the accuracy needed. The pressure difference between the upstream and the downstream flow. Determination of coefficient of discharge venturi meter. Procedure let us first define the venturi meter and the way it works in order to proceed in the experiment. Cfd was applied to numerically predict the calibration coefficient of orifice meters in order to ease the laborious experimental procedure of calibration 5. There is an inlet water valve, an air pipe operated water flow control valve, a magnetic inductive flowmeter, a turbine flowmeter, a rotameter, an ultrasonic flowmeter, an orifice meter, and a venturi meter. It consists of a robust frame which holds a water tank or reservoir, an electric pump, a flowcontrol valve, a flow meter and a venturi.
A venturi meter is a device that is used for measuring the rate of flow of fluid through a pipeline. Utube manometers containing oil are used to measure the pressure drop across the venturi and orifice meters. The flow rate can be accurately accounted for if the venturi meter is calibrated using a relation with manometer height difference. The losses caused by flow through a venturi meter are negligible and the discharge coefficient is about 0. Pdf che241 lab report flowmeter measurement apparatus. With the principle behind its operation being the bernoullis equation, the venturi meter is considered. Cebu city, 6000 philippines this experiment aims to be calibrate both the venture apparatus and the orifice apparatus. The frame includes a handy worktop for student paperwork. Venturi meter is a device in which pressure energy is converted into kinetic energy and it is used for measuring the rate of flow of liquid through pipes. Applying bernoullis equation to points and of the venturi meter and relating the pressure difference to the flow rate yields. 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. There is a limitation that the diameter which is around 80mm or less than 80 mm can not use venturi meter.
Calibration of venturi and orifice meters hirizza junko m. Figure 1schematic of the venturi meter 1to determine q theo, first, one needs to find the relationship between the velocities v 1 and v 2 using bernoullis equation. In the converging section of the venturi meter, the flow is accelerated continuously, and therefore, the losses are considered small. It contains a venturi type flow meter, an orifice plate flow meter as well as a. To determine the coefficient of discharge of the orifice meter 1.
The pressure difference between the upstream and the downstream flow, h, can be found as a function of the flow rate. The model me8598 venturi apparatus includes the connectors and tubing needed for doing the experiment with either air or water. Pdf calibration of flow meters lab report samson svondo. The pressure along the meter is obtained using the 11 pressure taps at the locations shown on the diagram. Calculating the flow rate of fluid that is discharged through the pipe. Typical venturi meter construction writing bernoullis equation between section 1 and 2 we have. Jan 11, 2017 calibration of venturi and orifice meters 1. The materials that will be used in this experiment are. Venturi, standard concentric orifice plate, vcone, and wedge flow meters shown in fig. In order to use any of these devices for measurement it is necessary to empirically calibrate them. The original, or classical, venturi was invented by a u. Figures 1 and 2 show the details of the apparatus for this experiment.
More specifically, this simple venturi meter, constructed from materials available at a local hardwareauto parts store, was characterized by determining the venturi coefficient and. It works on the basic principle of bernoullis equation. Venturi flume for measuring water in open channels, in order that those in practical need of such a device may know of its existence. Pressure gauges show the pressure upstream of the venturi and the pressure at the venturi throat. The basic principle on which a venturi meter works. Onsite calibration of flow metering systems installed in buildings. Venturi meter1 water supply flow meter stop watch calculator b. The venturi meter is constructed as shown in figure 2. Find qa values corresponding to manometer readings. The major objective of this experiment was to construct, test and model a simple, inexpensive venturi meter. The orifice plate is the simplest and cheapest type and occupies the least space, but has an appreciable overall pressure loss. The apparatus consists of a flow bench from where water can flow to the venture meter.
The third and final type of obstruction meter is the venturi, named in honor of giovanni venturi 17461822, an italian physicist who first tested conical expansions and contractions. The main objectives of this experiment is to obtain the coefficient of discharge from. Till abstract orifice and venturi flow meters decrease the pressure of a fluid by increasing its velocity as it flows through them. Calibration of venturimeter flow measurement fluid. Notable factors in comparing application of the venturi solution to a pipe meter with using the venturi solution on a longthroated flume are the magnitude of head differential observed as flow moves from the approach section, then is accelerated through the constricted throat sections. Venturi meter has a limitation and that is its low reynolds number of 150,000. Fluid mechanics lab oratory manual calibration of orifice meter. The whole assembly of venturi meter, manometer tubes, scale and manifold is supported on a base mounted on adjustable screwed feet. Differential pressure type flow meters head flow meters measure flow rate by introducing a constriction in the flow. Venturi calibration services is specialized in meters with a differential pressure output such as orifice plates, venturi meters, isa nozzles and asme ptc6. Keywords venturimeter, computational, calibration,coefficient of discharge i.
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