I. To find the coefficient of discharge for vcnturi meter. 2. To find the coefficient of discharge for ori rice meter.


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1 Flow Measurement by Venturi and Orifice Meters Objectives: I. To find the coefficient of discharge for vcnturi meter. 2. To find the coefficient of discharge for ori rice meter. Venturi and Orificemeters are the most commonly used nowsensing elements in : industries. The venturitube has a converging conical inlet, a cylindrical throat, and a diverging recovery cone. It has no projections into the fiuid, no sharp corners, and no sudden changes in contour ~toj. ~...../..... The inlet section decreases the :.lrea of the JluiJ stream. causing the velocity to increase and the pressure to decrease. The low pressure is measured in the center of the cylindrical throat since the pressure will be at its lowest value, and neither the pressure nor the velocity is changing. The recovery cone allows for the recovery of pressure such that total pressure loss is only 10% to 250/<. The high pressure is measured upstream of the entrance cone. The major disadvantages of thi.~ type oj' now detection are the high initial costs for installation and difficulty in installation and inspection.
2 u, u The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section of pipe. The fluid velocity must increase through the constriction to satisfy the equation of continuity, while its pressure must decrease due to conservation of energy: the gain in kinetic energy is balanced by a drop in pressure or a pressure gradient force. An equation for the drop in pressure due to Venturi effect may be derived from a combination of Bernoulli's principle and the equation of continuity. The basic equation for venture meter is obtained by writing the Bernoulli equation for incompressible fluids across the upstream cone. If VI and V~ are average upstream and down stream velocities, respectively and p j>den0y of the fluid then equation becomes z z _ Z(P 1 '  Pz) alv l  azvz (1). p, Where a l and az are kinetic energy correction factors at position I and 2. The continuity equation can be written sinrhe density is constant as V, = (~:fv2./. f Where Dz = diameter of throat in meters Al = diameter of pipe in' mete:'s Where f3 is the ratio of the diameter of throat to that of diameter of pipe. Above equation applies strictly to the frictionless now to account for the small friction loss between locations and 2 equation 3 is corrected by iutroducing an empirical factor C v and writing "" \ Cv; /'Z(Pl  Pz) J 1 f34 'J P The small effects of the kinetic energy factors at and az are also taken into account in the definition of C v.
3 Where 52 is cross sectional area of throat in m 2. Substituting (PI  P 2 ) = pgh in the equation (5) we get Q;;;= I V = ] c~~ 2gH ~~)1,)1 _J]4 'v. \I ej (JaM..1 j1c1111 \;y 'f.j"~ ( 4. H = manometric difference* (specific gravity of m.anometric fluid ~ specific gravity of An orifice plate is a device used to measure the rate of fluid flow. It uses the :'lame principle as a Venturi meter, namely Bernoulli's principle which says that there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases and vice versa. Differential ManometrIC difference \ pipe in which fluid flows. As fluid flows through the pipe, it has a certain velocity and a certain pressure. When the fluid reaches the orifice plate, with the hole in the middle, the fluid is forced to converge to go through the small hole; the point of maximum convergence actually occurs shortly downstream of the physical orifice, at the socalled venacontracta point. As it does so, the velocity and the pressure changes. Beyond the vena contracta, the fluid expands and the velocity and pressure change once again. By measuring the difference in fluid pressure between the normal pipe section and at the
4 venacontracta, the volumetric and mass t10w rates can be obtained from Bernoulli's equation. 1. Check all the clamps for tightness. 2. Check whether the water level in the ump is sufficient such that the suction pipe of pump is immersed. 3. Switch on the pump. 4. Open the gate valve and start the t1ow. 5. Open the outlet valve of the venturi meter and close the valve of orifice meter. 6. First open air cocks then open the venture meter cocks, remove all the air bubbles and close the air cocks slowly and simultaneously so that mercury does not run away into wate. (t 0') 8. Close the gate valve of measuring tank and measure the time for 5 liters of water for discharge, and the manometer difference. 9. Repeat the procedure by changing the discharge and take 10. Repeat the same for orifice meter. S.No I Manometer difference h (m) Time for 5 Lt water Q(actual) discharge (sec) m 3 /sec
5 S.No Manometer difference Time for 5 Lt water Q(actual) hem) discharge (sec) m 3 /sec For venturi meter Cross sectional area at throat to venturi meter S2 = 1.76 * 10' 4 m 2 The ratio of the diameter of throat to that of diameter of pipe {J is For orifice meter Cross sectional area to orifice meter S2 = 1.54 * 10' 4 m 2 The ratio of the diameter of orifice to that of diameter of pipe {3is The actual flow rate (Qa) Vs >/IJP for venturi meter. 2. The actual flow rate (Qa) Vs >/IJP for orifice meter. 1. Book: 'Unit Operations of Chemical Engineering' by McCabe and Smith (visited on ) (visited on ) (visited on ).
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