Our calibration capabilities include a wide range of flow rates, temperatures, and pressures utilizing numerous test gasses. The basic principle on which a venturi meter works. The angle of the diverging cone does not influence the calibration coefficient, but it does have an effect on the overall head loss through the tube. Calibration of venturimeter and orificemeter flow measurement. Bacalso avenue, cebu city chemical engineeing department final report che lab 1 title of experiment juphil a. 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 experiment has also increased my knowledge about the turbulent and laminar flow and their causes. Bernoullis theorem definition, applications and experiment duration.
Materials and methods a manometer figure 1, an orifice flow meter figure 2, and a venturi flow meter figure 3 were used to measure the flow rate and pressure change of. It is a cheaper device as compared to venturimeter. The venturi flow meter obtains a pressure differential by constricting the flow area and therefore increasing the velocity at the constriction, which creates a lower pressure according to bernoullis theorem. 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. This also work on the same principle as that of venturimeter. However, for smaller pipes orifice meter is a suitable choice. Calibration of venturi and orifice meters slideshare. Pdf experimental investigation of the installation. The whole assembly of venturi meter, manometer tubes, scale and manifold is supported on a base mounted on adjustable screwed feet.
Determination of coefficient of discharge through venturimeter procedure. A venturi meter may also be used to increase the velocity of any type fluid in a pipe at any particular point. A venturi meter is a device that is used for measuring the rate of flow of fluid through a pipeline. The water flow rate can be adjusted using the valves on the hydraulics bench. Calibration of venturi and orifice meters hirizza junko m. Determination of coefficient of discharge venturi meter. 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. The inlet diameter equals d 26 mm and the throat diameter d 16 mm. The concentric orifice plate flow meter reduces the pressure by forcing the fluid through a thin plated circular opening.
To plot the coefficient of discharge of a venture versus reynolds no. The flow through venturi meter can calculated from the following equation. Cebu city chemical engineeing department final report che lab 1 title of experiment juphil a. It consists of flat circular plate which has a circular hole, in concentric with the pipe. Amenities for creating standardized flows are necessary for flow meter calibration. The purpose of this experiment is to determine the value of k for a orifice. Determination of coefficient of discharge venturi meter experiment. 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. Venturi tubes are appropriate for clean, dirty and viscous liquid and few slurry services as well. Calibration of venturimeter and orificemeter free download as pdf. Venturi meter and orifice meter are the commonly used flow meters for measuring massvolumetric flow rate or velocity of the flowing fluid. More specifically, this simple venturi meter, constructed from materials available at a local hardwareauto parts store, was characterized by determining the venturi coefficient and. Bsen 3310 lab 2calibration of orifice flow meter and.
The most commonly used inferential or rate meter is the thinplate, concentric orifice meter which is the primary device discussed in this paper. To calibrate the given venturimeter and to determine the coefficient of discharge for the same. This flow measurement device is based on the principle of bernoullis equation. Flow meter calibrations colorado engineering experiment. Qk h where is the meter calibration constant and is the manometer reading that measures the pressure drop before and after the orifice. The major objective of this experiment was to construct, test and model a simple, inexpensive venturi meter. 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.
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. One important experiment performed in the laboratory is in the calibration of a meter in a pipeline. Inside the pipe, pressure difference is created by reducing the crosssectional area of the f. The two sections are joined by a constriction that is commonly referred to as the throat.
Energy losses through venturi, orifice, and rotameter flowmeters. The lbe flow rates have been measured by the venturinozzle flow meter installed on the feeding conduit, using the equation carried out for the flow meter during the calibration tests, previously. Venturi meter and orifice plate effects are two main and very important phenomenas in fuild mechanics sub field of mechanical engineering. To plot the coefficient of discharge of a sharp orifice versus reynolds no. 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. Venturi flume for measuring water in open channels, in order that those in practical need of such a device may know of its existence. Venturimeter in a venturi meter there is first a converging section in which the cross sectional area. The venturi is widely used particularly for large volume liquid and gas flows since it exhibits little pressure loss. The venturi meter experiment has opened my mind and it has helped me better understand the continuity equation and the bernoulli equation. Figure 1 venturi meter h5 the venturi meter has three main. 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.
Yamamoto department of chemical engineering, college of engineering and architecture, cebu institute of technology university n. Discharge coefficient performance of venturi, standard. Cebu city, 6000 philippines this experiment aims to be calibrate both the venture apparatus and the orifice apparatus. A venturi meter is a device for determining fluid velocities. To find the coefficient of discharge for venturi meter.
Detailed information about these components is given in this chapter. The set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring instrument or measuring system and the corresponding values realized by standards. 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 fluid whose flow rate is to be measured enters the entry section of the venturi meter with a pressure p1. Fm 308 flow measurement by venturi and orifice meter.
To find the coefficient of discharge for orifice meter. Theory the operating principles of these various meters need to be developed in order to meaningfully compare their performance. This is an experimental write up for the calibration of flow meters as observed and carried out at the national university of science of technology zimbabwe. It basically works on the principle of bernoullis theorem. 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. Within the accuracy of the experiment, the discharge coefficient was independent of the use of a separable conical diffuser in a venturi meter appears feasible and of introduction in situations requiring low pressure loss, the venturi meter is one of the most com monly used devices for the measurement of flow rate. 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. With the principle behind its operation being the bernoullis equation, the venturi meter is considered. A simple, inexpensive venturi experiment applying the. The water displacement across the manometer is 3 cm. A venturimeter is a device used to measure the fluid flow through pipes. The experiment is designed to study uniform water flow over a range of flow rates.
Pressure recovery for venturi tubes is a lot better as compared to the orifice plates. Given the measurement error, this application calculates the potential range of flowrates. From consideration of continuity between the mouth of the venturi of area a 1 and the throat of area a 2. A schematic of the venturi meter is shown on the diagram at the end of the procedure. 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. Venturi meter problems, bernollis principle, equation of continuity. The original, or classical, venturi was invented by a u.
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