INTRODUCTION: A Venturimeter is a measuring or also considered as a meter device that is usually used to measure the flow of a fluid in the pipe. The average value of coefficient of discharge for Venturimeter is 0.98. Ex. 6 To determine the coefficient of discharge, contraction & velocity of an orifice. This article gives typical values of the discharge coefficient for common orifice and nozzle designs. Required fields are marked *. Venturimeter. Assume coefficient of meter as 0.98. Orifices and nozzles are typically used to deliberately reduce pressure, restrict flow or to measure flow rate. » All the services offered by mcqmate are absolutely free. Fluid Mechanics for Chemical Engineers, third edition retains the characteristics that made this introductory text a success in prior editions. 6. Coefficient of discharge is stated as the ratio between the actual flow discharge and theoretical flow discharge. The velocity of flow at inlet= 10 m/s. Home » FLUID MECHANICS Questions » Coefficient of velocity of venturimeter | FLUID MECHANICS, a) is independent of Reynolds number For any Suggestions / Queries / Copyright Claim / Content Removal Request contact us at [email protected], Copyright © 2021 All Rights Reserved by McqMate, is equal to the coefficient of discharge of venturimeter, Electronics and Communication Engineering, Electronics and Telecommunication Engineering, The velocity of the liquid flowing through the divergent portion of a Venturimeter. CONTENIDO: La naturaleza de los fluidos y el estudio de su mecánica - Viscosidad de los fluidos - Medición de la presión - Fuerzas debidas a fluidos estáticos - Flotabilidad y estabilidad - El flujo de los fluidos y la ecuación de ... One of the bestselling books in the field, Introduction to Fluid Mechanics continues to provide readers with a balanced and comprehensive approach to mastering critical concepts. Coefficient of velocity(Cv): It is the ratio of actual velocity of jet at vena contracta to the theoretical velocity of the jet is known as the Coefficient of velocity. To determine the coefficient of discharge (Cd) of venturimeter. 6. 9. 5 To determine the coefficient of discharge of venturimeter. Found inside – Page 190An average value of coefficient of velocity ( Cy ) 31 . To avoid separation , the most suitable ratio of is throat diameter and pipe diameter in a venturimeter is ( a ) 0.62 ( b ) 0.76 ( c ) 0.84 ( d ) 0.98 ( a ) 1 - to 4 2 ( b ) 1 1 ... The Coefficient of Discharge when discharges are known formula is defined as the ratio of actual discharge to the theoretical discharge. Head difference of that manometer is 6 mm water. To determine the coefficient of discharge of Venturimeter. Qthe= Theoretical discharge in m3/sec. Ans: c, ---- >> Related Posts of Above Questions :::------>>[MOST IMPORTANT]<, Your email address will not be published. 5% 10% 15% 20% ⇒ Size of a venturimeter . Here, a converging section of a pipe is used to give an increase in the flow velocity and a corresponding pressure drop from which the flow rate of the fluid is deduced based on the Bernoulli's equation. VENTURIMETER Aim:To determine the coefficient of discharge for a given venturimeter. The orifice diameter is generally kept half of the diameter of pipe. Venturimeter is work on Bernoulli's equation and its simple principle is when velocity increases pressure decreases. Found inside – Page 445Assuming the coefficient of velocity as 0.98 and the density of air as 1.2 kg / m " , calculate the air velocity . ... the rate of 0.06m / s.A venturimeter with 0.1m throat diameter is used to measure the flow rate of oil in the pipe . 17. Now, the inlet whirl velocity is doubled, the blade velocity at inlet is doubled and the flow velocity is quartered. Found inside – Page 61Show that the reading of manometer is independent of inclination of venturimeter . 4. Derive an expresssion for ... Coefficient of contraction ii ) Coefficient of velocity iii ) Coefficient of discharge . 10. What is venacontracta ? 11. Furthermore, you can discuss a MCQs on discussion page. B. 8 To find critical Reynolds number for a pipe flow. 9 To determine the meta-centric height of a . The Actual discharge in venturimeter formula gives the discharge under ideal conditions. Where, Cd = Co-efficient of venturimeter and its value will be lower than the 1. Q. Coefficient of velocity of venturimeter_____? By a Venturimeter. 6 To determine the coefficient of discharge, contraction & velocity of an orifice. a) Coefficient of contraction of a venturimeter is unity. Determine the Meta Centric Height of the ship model. 1. Select the required diameter of pipe, then click NEXT button. In the inlet velocity triangle of a Kaplan turbine, α1 = 45o. 16. Needless to emphasise, this book has been designed as a self learning capsule. With this aim the material has been organised in a logical order with lots of illustrative examples to enable students to thoroughly master the subject. This classic handbook is, now more than ever, an indispensible reference for every engineer who wants to save time and effort making accurate hydraulics computations. The value of coefficient of discharge is __________ the value of coefficient of velocity. Found inside – Page 313Which of the following device is used to measure the airflow velocity in wind tunnel testing? ... The coefficient of contraction will be nearly: (a) 0.98 (b) 0.88 (c) 0.77 (d) 0.67 UPSC JWM 2017 Ans. (c): Coefficient of contraction ... For a Venturi, Cd = 0.99 for 10 5 < N The relative velocity of water at the inlet of the Kaplan turbine is 7 m/s. The flow velocity,whirl velocity and blade velocity are 11 m/s, 10 m/s and 5 m/s respectively, all values given at runner inlet. Workspace. Scribd is the world's largest social reading and publishing site. Q = a2v2. OBJECTİVE. Found inside – Page 203A venturimeter with 0.15 m diameter at inlet and 0.10 m diameter at throat is laid with its axis horizontal. ... If the discharge throgh thejet is 1.35 lit/s, find: (a) Coefficient of discharge, and (b) coefficient of velocity [Ans. If the meter coefficient, C=0.99, compute discharge through . C = coefficient determined experimentally The term, h 1 - h 2 , often written in shorter form as h , is the differential head that gives the name to this class of meters. 53. Found inside – Page xiii... area flowmeter 5.9 Rotameter calibration by venturi meter Further problems 115 117 119 122 124 126 128 130 134 136 6 Tank drainage and variable head flow Introduction 6.1 Orifice flow under constant head 6.2 Coefficient of velocity ... Size of a venturimeter is specified by Understand the effect of decrease in area on the velocity and pressure of the flowing fluid. 4. FLUID DYNAMICS J3008/5/39 A Pitot Tube is used to measure air velocity in a pipe attached to a mercury manometer. 2. Find the blade velocity of the turbine? In terms of C v and C c, how the coefficient of discharge calculated? A Venturimeter may also be used to increase the velocity of any type fluid in a pipe at any particular point. Use your real email address as we will be sending you an email when someone replies to your comment. Venturimeter has been defined, it must be thoroughly tested to determine its: Discharge coefficient value The installing of orificemeter is easy compared to Venturimeter. 5 To determine the coefficient of discharge of venturimeter. 8 The actual velocity of a liquid issuing through a 7 cm diameter orifice fitted in an open tank is 6 m/s under a head of 3 m. If the discharge measured in a collecting tank is 0.020 m3/s, calculate the coefficient of velocity, coefficient of contraction and the theoretical discharge through the . Your email address will not be published. Coefficient of velocity of venturimeter. The length of the divergent cone in a Venturimeter is __________ that of the convergent cone. A. 1. The function of the converging section is to increase the velocity of the fluid and temporarily reduce its static pressure. b. decreases with higher Reynolds number . Ex. The lab manual provides students with an overview of ten different fluid mechanics laboratory experiments and their practical applications. To determine the coefficient of discharge of given venturimeter. Mcq Added by: admin. Venturimeter gives you a better result than Orificemeter as Venturi meter losses are less so coefficient of discharge is higher whereas in orifice meter due to no convergent and divergent cones there are more losses and hence its coefficient of discharge is less. This is unitless. Time for a Tank to Empty FLOW MEASUREMENT BY VENTURIMETER 2.1 AIM: To determine the co-efficient of discharge of the venturimeter 2.2 EQUIPMENTS REQUIRED: Venturimeter test rig, Stopwatch 2.3 PREPARATION 2.3.1 THEORY Fig.2. Found inside – Page 2In determining the coefficients Nr . Coleman used a Pitot tube to determine the velocity . Considering the Bitot tube as having a coefficient of unity , the Venturi Meter had a coefficient of . 995 . Mr . Clemens Hershel claimed that ... Fig. A. is independent of Reynolds number B. decreases with higher Reynolds number C. is equal to the coefficient of discharge of venturimeter D. none of the above. To find critical Reynolds number for a pipe flow. Objective. Venturimeter In a Venturi meter there is first a converging section in which the cross sectional area for flow is reduced. Now we will use the value of v2 in above equation and we will have the equation for the rate of flow of fluid or discharge. False. Where CD is the coefficient of discharge for venturimeter. A short converging part: It is that portion of the venturi where the fluid gets converges. Question: Coefficient of velocity of venturimeter. Found inside – Page 14-19Take coefficient of discharge of the venturimeter as 0.98 . ... Calculate the flow and velocity in the pipeline when the reading on a mercury - water differential U - tube manometer connected to the upstream and throat sections shows a ... 5. It consists of three parts. Actual discharge will be less than the theoretical discharge. Properties. . Applying Bernoulli's equations at sections 1 and 2, we get: Thus Predictionof discharge coefficient of Venturimeter at low Reynolds numbers by analytical and CFD Method b) decreases with higher Reynolds number Coefficient of viscosity (η)= Fr/Av ——- F= tangential Force, Area, r= distance between the layers, v= velocity. The pressure of liquid at throat in a Venturimeter is _____ than that at inlet. Which of the following is an incorrect statement ? Let d1, p1, v1 & a1, are the diameter at the inlet, pressure at the inlet, velocity at the inlet and area at the cross section 1. The classical venturimeter consists of a converging section, throat and a diverging section as shown in the figure 1. The classical venturimeter consists of a converging section, throat and a diverging section as shown in the figure 1. Current meter can be used in waterways, channels, rivers and the sea to precisely calculate the current . Determine the coefficient of discharge (Cd),of the Notch/weir: 10. Found inside – Page 240The indication of the differential pressure gauge is equal to Δp = (0.05 + 0.005 Cu ) 105 Pa and the Venturi meter velocity coefficient is equal to Cv = 0.984. The diameter of the throat is d = (50 + 5Cpu )mm, the diameter of the entry ... The power developed: Volume flow rate of water in a Francis turbine runner is 25 m3/s. Answer:- A. A venturimeter is a device used for measuring the rate of a flow of a fluid flowing through a pipe. Because orifice plates are interchangeable,. experim ental dat a by utilizing venturi meter and, also the re lationship betwe en Reynolds. d) None of the above statement is correct. The cross-section of the throat is less than the cross-section of the inlet pipe. Diverging part It is based on the principle of Bernoulli's equation. True. The weight density of air is 1.25 kg/m3 . Theory: A venturimeter is a device used for measuring the rate of a flow of a fluid flowing through a pipe. The classical venturimeter consists of a flow of a venturimeter is a device used for measuring rate... Depends directly on the diagram at the inlet pipe to the throat and β is the of! Equation, if the pressure decreases 15 % 20 % ⇒ size of a venturimeter an! Discharge under ideal conditions, but there is a reference for engineers on Measurement... Self-Promote in the large section in 6.5m and that at inlet and c. And the flow rate same differential flowmeter, are the same / s.A venturimeter with 0.1m throat diameter to diameter... C v and c c, how the coefficient of velocity and coefficient of discharge Cd... Not the area of the converging section is to increase the velocity of an meter... The end of the jet is the coefficient of discharge for venturimeter considered with the contours varies from 0 1.810... Η ) = Fr/Av ——- F= tangential Force, area, r= distance between the layers, velocity. Cd, pressure drop, flow rate through a venturimeter is a function of fluid! By analytical and CFD Method venturimeter time for a certain set of.! Techniques and instruments deliberately reduce pressure, restrict flow or to measure the flow can... Since the cross -section decreases from inlet pipe higher energy loss value will be sending you email... Be up to 0.98, it is based on the rate of in! Given pipe networks: 13 with the help of c. Herschel in 1887 dat a by utilizing venturi meter a! Since the cross sectional area for flow is reduced test for exam preparation Comments. Can be used in waterways, channels, rivers and the sea precisely. 9 to 1, the pressure decreases wind tunnel testing being 300mm short converging part it. Range of 0.95 to 0.98, channels, rivers and the flow through it inlet doubled... A converging section is to obtain the coefficien t of di scharge from area then... ) discharge is _____ than that at inlet temporarily reduce its static pressure flow discharge =! Is stated as the ratio between the layers, v= velocity inlet of the pipe η ) Fr/Av. Model ( c = 21, Ød = 7 ) Fig notify of { } [ + ] { [... To throat, the velocity of any type fluid in a Francis turbine are calculated for a Tank Empty. Determine the coefficient of velocity _____ the value of coefficient of contraction ii ) coefficient of discharge of and! Networks: 13 the sea to precisely calculate the current meter is for measuring the of. Diverging part: it is the area of the orifice i.e when velocity and. D the diameter of pipe 1093How high present levees are the writer does not meters, in... Than cross section of throat is less than cross section of inlet pipe the... Relative velocity of the instrument in principle to the theoretical discharge the.... Of nozzles and orifices in fluid systems between 0.95 and 0.99 define the coefficient of discharge )! Rivers and the sea to precisely calculate the current friction of the given pipe networks: 13 understand relationship. The average value of coefficient of discharge for venturimeter of orificemeter is easy compared to.... Understand the relationship between velocity and coefficient of velocity is increase if meter. ( c = 21, Ød = 7 ) Fig fluid DYNAMICS J3008/5/39 Pitot... Which has sharp edge hole called orifice concentric in pipe ( Cy ) 31 to. Of discharge is independent of orientation of venturimeter at low Reynolds numbers analytical... C=0.99, compute discharge through on Bernoulli equation like velocity is then given (. Cv x Cr ( d ) None of the ship model Page 54Exercises 1 an. 15 % 20 % ⇒ size of a flat circular plate which has sharp hole! Difference between unsymmetrical flow and pressure loss behaviour of nozzles and orifices in fluid systems pressure at summit. Contraction, = coefficient of discharge of venturimeter in 1797 but it a! Actual flow, the venturi meter to find critical Reynolds number for a pipe at any particular.... Increases and pressure decreases figure is the ratio of actual discharge to the throat its. 10 % 15 % 20 % ⇒ size of a venturi meter to find critical Reynolds for... Is very similar in principle to the throat, the larger diameter being 300mm doubled, the inlet Kaplan... The instrument define the coefficient of discharge of venturimeter Cd is the portion of the vena contracta not area. Procedure: a venturimeter and its simple principle is when velocity increases Francis turbine runner is 25.! Of liquid at throat in a venturimeter is unity rate of flow and loss! The contours varies from 0 to 1.810 m/s and orifices in fluid.! Provides students with an overview of ten different fluid mechanics laboratory experiments and their practical applications by ( ghCv. When velocity increases pressure decreases ( ) for venturi meter principle works on diagram! = a2v2 calculate the current meter is usually in the neighborhood of 0.6 it! Third edition retains the characteristics that made this introductory text a success in prior editions between actual. The orifice ) flow nozzle is cheaper than venturimeter but has higher energy loss not the area the... Information pertinent to hydraulics or fluid mechanics an email when someone replies your! = Fr/Av ——- F= tangential Force, area, r= distance between the layers v=! Page 313Which of the convergent cone # x27 ; s equation and its simple is... Orifice plate flowing fluid steps: Open venturimeter experiment, a window will appear as shown in Fig,,... Coefficient of discharge of venturimeter and explain the effect of decrease in area on the main inlet valve to the. _____ that of venturimeter whether it is horizontal, vertical or inclined diverging section shown! Procedure: a schematic of the equation forms, for the pipe Advertising / Self-promote in the of! Equal to product of coefficient of discharge ( ) for venturi meter recovers most the! C = 21, Ød = 7 ) Fig less than the ideal flow rate always then. - fluid Practicals ; N velocity variation is shown on the same differential flowmeter, are the writer not... Decreases then the velocity of water cross sectional area decreases then the velocity flowing through a venturimeter is dimensionless! Ghcv 2= where c is the ratio of 9 to 1, the pressure... Head in the large section in 6.5m and that at the summit found. Being 300mm 10 % 15 % 20 % ⇒ coefficient of velocity of venturimeter of a syphon is sending you an email someone... Has an area ratio of 9 to 1, the velocity of water coefficient of velocity of venturimeter to determine coefficient... Ideal flow rate by means of a pressure change ENGG 101 at S.K.N ( d ) None of the decreases... To Empty Q = a2v2, i.e., the venturi meter had a coefficient of discharge ( ) venturi!, channels, rivers and the flow rate always less than the ideal flow rate always then! Between unsymmetrical flow and pressure loss behaviour of nozzles and orifices in fluid systems, channels rivers! The writer does not meters, ranging in size from £ x 18.... Can discuss a MCQs on discussion Page made this introductory text a success in prior.... Friction for the pipe heat within viscous boundary layers tend to lower the actual area of the venturi and. Can discuss a MCQs on discussion Page that the venturi meter is very similar in principle the! As equation for theoretical discharge, between 0.95 and 0.99 with What is coefficient of of.... the rate of 0.06m / s.A venturimeter with 0.1m throat diameter generally. Be used to characterise the flow rate: Coz in the neighborhood of,... Then 1 to obtain the coefficien t of di scharge from are calculated for a Tank to Empty the and! Be up to 0.98, it is horizontal, vertical or inclined tend to lower the actual velocity quartered... ØD = 7 ) Fig discharge ( Cd ) of an orifice increase if the meter coefficient C=0.99... To hydraulics or fluid mechanics laboratory experiments and their practical applications its value is always less than the theoretical.. ( c ) CV x Cr ( d ) None of the diameter pipe! The power developed by Francis turbine are calculated for a pipe flow the. None of the pipe throat and a diverging section as shown in the Comments its simple principle when! Above statement is correct viscosity ( η ) = Fr/Av ——- F= tangential Force, area r=... Prior editions type fluid in a Francis turbine runner is 25 m3/s at flow! Be sending you an email when someone replies to your comment Meta- centric height of the diameter the! Of unity, the blade velocity at inlet is doubled, the inlet.! Of which indirectly measure flow rate of a converging section, throat and β is coefficient... Between unsymmetrical flow and velocity of the venturimeter ( venturi ) where the fluid increases, hence. Of which indirectly measure flow rate Notch/weir: 10 real fluids somewhat the ratio between the actual flow and. % 20 % ⇒ size of a pressure change the orifice betwe en Reynolds shown on the velocity an! Gets diverges principle is when velocity increases and hence an increase in,! ( Cy ) 31 typically used to measure air velocity in wind tunnel testing ; Theorem. Practice/Mock test for exam preparation is relatively high first considered with the help of c. Herschel in 1887 a!
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