MENG353-Exp2-18700815.docx - Eastern Mediterranean...

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EasternMediterraneanUniversityDepartmentofMechanicalEngineeringLaboratoryHandoutCOURSE:Fluid Mechanics(MENG353)Semester:SPRING (2020-2021)NAME OF EXPERIMENT:FLOW THROUGH A VVENTURI METERInstructor: Assoc. Prof. Dr. Hasan HacışevkiAssistant: Erfan MalekianSubmitted by: Sultan ElturkemanyStudent No: 18700815Group No: 01Date of experiment: 19/05/2021Date of submission: 31/05/2021----------------------------------------------------------------------------------------------------------EVALUATIONActivity During Experiment & Procedure30%Data , Results & Graphs35%Discussion, Conclusion & Answer to Questions30%Neat and tidy report writing5 %Overall Mark1
1. INTRODUCTION :The Venturi tube is a device that measures the flow rate in a pipe. With an increase in thevelocity in the throat, fluid moving through it accelerates in the direction of the taperingcontraction. A drop in pressure follows, the magnitude of which is determined by the rate offlow. The difference in pressure measured by piezometers placed upstream at the throat can thusbe used to estimate the flow rate. The Venturi effect describes the influence of the meter onpressure changes. A venturi can also be used to combine a gas and a liquid. If a pump forcesliquid through a tube connected to a system that includes a venturi to increase liquid speed (sothe diameter decreases), a short piece of tube with a small hole, and finally a venturi to decreasespeed (so the pipe gets wider again), the gas will be sucked in through the small hole due topressure changes. At the end of the system, a mixture of liquid and gas will appear.2. DESCRIPTION OF APPARATUS:Figure 1.1 shows the arrangement of the venturi meter, which is manufactured in clearplastic material. Water is admitted from the bench supply valve and passes through a flexiblehose into the meter. Beyond the control valve, which is mounted just downstream of the meter afurther flexible hose leads to the measuring tank. The manometer tube, mounted in front of ascale marked in millimeters. The manometer tubes are connected at their top ends to a commonmanifold, in which the amount of air may be controlled by a small air valve at one end. Thewhole assembly is supported on a base mounted on adjusting screws which serve to level theequipment.3
Fig 1.1 Arrangement of Venturi meter apparatus3. THEORY OF THE VENTURI METER:Consider flow of an incompressible, inviscid fluid through the convergent – divergent Venturitube shown in Fig 1.2. The cross sectional area at the upstream section 1 isA1, at the throatsection 2 isA2, and at any other arbitrary section n isAn. Piezometer tubes at these sectionsregisterh1,h2andhnabove the arbitrary datum shown. Note that, although the tubemay have any inclination, the datum must by necessity, be horizontal. Assume that both thevelocity and the piezometric head are constant over each of the sections considered. This amountto assuming the flow to be one dimensional so that the velocity and the piezometric head varyonly in the direction of the tube length. We may then treat the convergent – divergent pip as astream tube along which Bernoulli theorem states.

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Term
Summer
Professor
NoProfessor
Tags
Pressure head, Orifice plate, Venturi meter