Second year civil engineering list of experiments sr. He carried out experiment in a nonstandard type of venturimeter with a wide throat. This is a demonstration of bernoullis principle using a venturi tube. This experiment made use of a venturi meter to allow for the.
The fluid whose flow rate is to be measured enters the entry section of the venturi meter with a pressure p1. 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. 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. 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. A simple, inexpensive venturi experiment applying the. A venturimeter or current meter is used to calculate the change in flow rate through a choked tube as described by the bernoulli equation. Inside the pipe, pressure difference is created by reducing the crosssectional area of the f. In venturi, pressure energy pe converted into kinetic energy ke to calculate flow rate discharge in a closed pipeline. Among the differential pressure flow meters, the venturi. Given a venturi meter, cv, the venturi coefficient can be determined to compare the actual and ideal values as per bernoullis predictions, for a volume flow rate. There is a pressure tap upstream from the orifice plate and another just downstream. It is the portion of the venturimeter venturi where the fluid gets diverges. 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.
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. To determine the coefficient of discharge of the orifice meter 1. It works on the basic principle of bernoullis equation. Object the purpose of this experiment is to study some of the famous instruments used in flow measurements. Its value varies slightly from one meter to another, and, even for a given meter it may vary slightly. A venturi is a convergingdiverging nozzle of circular crosssection. To find the coefficient of discharge for vcnturi meter. Venturi meter and orifice plate effects are two main and very important phenomenas in fuild mechanics sub field of mechanical engineering. Jun 01, 2018 venturimeter vs orifice meter in hindi. Seminar assignments, questions and answers lab experiment no. It is used to calculate the velocity of fluids in running through a pipeline. As the fluid proceeds further into the converging section, its pressure reduces gradually and it finally reaches a value of p2 at the end of the. The venturi flow meter consists of a streamlined contraction and a streamline expansion as shown the diagram. This investigation about improvisation of apparatus required experimental development method especially in assembling various components.
The concentric orifice plate flow meter reduces the pressure by forcing the fluid through a thin plated circular opening. 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. Venturi meter experiment procedures valve pressure. As the liquid flows through the pipeline, the device measures the pressure of the liquid before it enters the venturi tube and as it exits the. We will study is the venturi effect and how a venturimeter can be used, to understand some core fluid mechanics concepts. The inlet diameter equals d 26 mm and the throat diameter d 16 mm. Venturi meterconstruction, working, equation, application. Discharge coefficient performance of venturi, standard. He also observed that the meter was good for the study of fluid. Conclusion in this experiment cd the coefficient of discharge. Energy losses through venturi, orifice, and rotameter.
Venturi meter is a device or component which is used for measuring the rate. Venturi and orificemeters are the most commonly used nowsensing elements in. 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. To calibrate the given venturimeter and to determine the coefficient of discharge for the same. As the fluid proceeds further into the converging section, its pressure reduces gradually and it finally reaches a value of p2 at the end of the converging section and enter the cylindrical section. Che241 lab report flowmeter measurement apparatus fm101.
The venturitube has a converging conical inlet, a cylindrical throat, and a. In short, the apparatus allows the following experiment to be carried out. The 2nd figure is a measurement of the flow speed in an experiment. This inexpensive flowmeter is ideal for teaching the use of the bernoulli balance to model fluid systems.
Seminar assignments, questions and answers lab experiment. Construction and specification of venturi meter venturi is an example for restriction type flow meter. 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 constricted section or choke of a pipe. Differential pressure type flow meters head flow meters measure flow rate by introducing a constriction in the flow. They consist of short length of pipe shaped like vena contracta, or the portion with the least cross sectional area, which fits into a normal pipeline. 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.
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. From consideration of continuity between the mouth of the venturi of area a 1 and the throat of area a 2. It basically works on the principle of bernoullis theorem. Flow through venturi meter background and theory introduction flow meters are used in the industry to measure the volumetric flow rate of fluids.
Connect downstream end of apparatus to a plastic tube, the free end of which is directed into the hydraulic bench for measuring discharge from venturi. Venturimeter are used to measure the velocity of flow of fluids in a pipe. Venturi meter is a device or component which is used for measuring the rate of flow of liquid through pipes. Pdf experimental investigation of the installation effects on the. The standard deviation, for cd was also calculated to be. 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. Determine the relationship between reynolds number and the coefficient of discharge. Department of mechanical engineering venturi meter objective. The whole assembly of venturi meter, manometer tubes, scale and manifold is supported on a base mounted on adjustable screwed feet.
Conclusion in this experiment cd, the coefficient of discharge, was calculated for the venturi meter. If the velocity at any point decreases, the pressure at that point increases due to the conservation of the kinetic energy into pressure energy. A venturimeter is a device used to measure the fluid flow through pipes. To find the coefficient of discharge for orifice meter. To find the water flow rate using the venturi meter and the pressure distribution along the meter. Oct 02, 20 the venturi effect, published in 1797 by giovanni venturi, applies bernoullis principle to a fluid that flows through a tube with a constriction in it, such as in figure 2. It was created at utah state university by professor boyd f. To find the coefficient of discharge for venturi meter. Differential pressure type flow meters head flow metersmeasure flow rate by introducing a constriction in. Detailed information about these components is given in this chapter. 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.
Pdf experimental investigation of the installation effects. This flow measurement device is based on the principle of bernoullis equation. A venturi meter may also be used to increase the velocity of any type fluid in a pipe at any particular point. 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. 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. Fm 308 flow measurement by venturi and orifice meter objectives. Open fully the flow control valve on the right side of the hydraulic bench. The principle of a venturi meter is depicted in figure 12. The fluid flows inside the inlet section of the venturi meter having a pressure p1.
The working of venturimeter is based on the principle of bernoullis equation. Definition, parts, working principle, derivation, applications with pdf. To find the coefficient of discharge for oririce meter. Determination of coefficient of discharge for venturimeter. Venturi meter experiment procedures free download as word doc. A venturi meter is also called a venturi flowmeter. 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. Pdf che241 lab report flowmeter measurement apparatus. Keywords venturi meter, bernoulli balances, laboratory. A venturi meter, or venturi flow meter, is a device used to measure the velocity, or flow rate, of fluid flowing through a pipeline. Department of mechanical engineering venturi meter.
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. Venturi meter experiment procedures valve pressure measurement. Bsen 3310 lab 2calibration of orifice flow meter and venturi. The venturi tube provides a handy method for mixing fluids or gases, and is popular in carburetors and atomizers, which use the low pressure region generated at the. Set both the apparatus flow control and bench supply valve to approximately one third their fully open positions. Nov 20, 2016 venturi meter and orifice plate effects are two main and very important phenomenas in fuild mechanics sub field of mechanical engineering. Furthermore, still in the field of hydraulic experiment, a scientists called venturi after 7000 ad discovered a venturi meter. Energy losses through venturi, orifice, and rotameter flowmeters. The whole assembly of venturi meter, manometer tubes, scale and manifold is supported on a. The venturi meter, also known as venturi tube, belongs to the category of variable head flowmeters. 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. The main objectives of this experiment is to obtain. Calculate the coefficient of discharge from experimental data for a venturi meter.
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. For better comparisons, two separate trials were analyzed and venturi coefficients for both were computed. 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. Fm 308 flow measurement by venturi and orifice meter. Definition, parts, working, derivation, applications. Che241 lab report flowmeter measurement apparatus fm101 2015. Aug 20, 2016 this is a demonstration of bernoullis principle using a venturi tube. 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. The obstruction caused to the flow of liquid at the throat of the venturi produces a local pressure drop in the. The orifice meter consists of a flat orifice plate with a circular hole drilled in it.
Feb 07, 2015 venturimeter are used to measure the velocity of flow of fluids in a pipe. Venturimeter engineering explained engineeringclicks. The major objective of this experiment was to construct, test and model a simple, inexpensive venturi meter. This pressure drop is measured using a differential pressure sensor and when calibrated this pressure drop becomes a measure of flow rate. Cd for the venturi meter decreased as the flow rate decreased with each trial. The pressure along the meter is obtained using the 11 pressure taps at the locations shown on the diagram.
In simplest form, the pitot tube consists of a glass tube, bent at right. Switch on the hydraulic bench pump by pressing the black button on the right side of the hydraulic bench. The venturi meter constricts the flow using a herschel venturi tube. Differential pressure type flow meters head flow metersmeasure flow rate by introducing a constriction in the flow. Venturimeter is the most widely used device to measure the discharge through the pipe. Flow measurement by venturi and orifice meters objectives. A schematic of the venturi meter is shown on the diagram at the end of the procedure. The principle of the orifice meter is identical with that of the venturi meter.
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