EXPERIMENT NO. 4 CALIBRATION OF AN ORIFICE PLATE FLOWMETER MECHANICAL ENGINEERING DEPARTMENT KING SAUD UNIVERSITY RIYADH


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1 EXPERIMENT NO. 4 CALIBRATION OF AN ORIFICE PLATE FLOWMETER MECHANICAL ENGINEERING DEPARTMENT KING SAUD UNIVERSITY RIYADH Submitted By: ABDULLAH IBN ABDULRAHMAN ID: GROUP A EXPERIMENT PERFORMED ON 9/01/013 1
2 1 Introduction In this experiment an orifice plate flowmeter is calibrated and the calculated coefficient of discharge, C d, is compared to the given value in the lab report as well as other published data. The orifice plate flowmeter provides a simple and low cost method for measuring the flow rate in a pipe using the pressure drop measurement across the plate. The orifice plate is a circular plate with a sharp square edge hole in the center inserted in a pipe. When a fluid is allowed to flow inside the pipe, the orifice plate obstructs the flow which results in fluid pressure loss. A schematic diagram of an orifice plate installed in a pipe with flow from left to right is shown in figure 1. The pressure loss is dependent on the orifice diameter, pipe diameter and the flow rate. Hence the flow rate is less than the theoretical flow rate which would occur if there were no losses. Figure 1: Orifice plate schematic For ideal flow (no viscous effects) the flow rate can be calculated from Bernoulli s equation, as follows, [3], p 1 ρ + V 1 + gz 1 = p ρ + V + gz (1) Where, p, ρ, V, z and g are the fluid pressure, density, velocity, elevation and acceleration due to gravity, respectively. The subscripts 1 and denote the conditions upstream and downstream of the plate, respectively, as shown in figure Since the flow is incompressible we can write the flow velocity upstream of the orifice, V 1, in terms of the throat velocity, V, using the continuity equation given in equation, [3],
3 Figure : Orifice plate stations A 1 V 1 = A V () V 1 = A V = d V = β V (3) A 1 d 1 Where, β = d d 1 and d 1, d are the pipe and throat diameters, respectively. Substituting equation 3 into equation 1 assuming the flow is horizontal (z 1 = z = 0), we get, V V 1 = [ 1 ( ) ] 4 d d 1 V = (p 1 p ) ρ [ 1 β 4] V = (p 1 p ) ρ V = 1 1 β 4 (p 1 p ) ρ (4) (5) (6) Since the flow rate, Q, is given by Q = AV, where A and V are the crosssection area and average speed at any section, respectively, then we write the flow rate across the orifice plate as follows, Q = A V = A (p 1 p ) 1 β 4 ρ Equation 7, gives an expression for the maximum theoretical volume flow rate assuming ideal flow. However, since real flows are viscous, hence, the maximum flow rate will be less than the ideal value due to viscous losses. This is taken into account by multiplying the ideal Q by a factor, C d, this factor is the coefficient of discharge. Hence, we can define the coefficient of discharge as the ratio of actual to ideal volume flow rate. Q Actual = C d Q Ideal = C da (p 1 p ) 1 β 4 ρ The coefficient of discharge depends on the Reynolds number based on the pipe s diameter as well as the orifice diameter to pipe diameter ratio, β. The main objective of this experiment is to determine this coefficient. In the next section, the apparatus and techniques used to determine C d are discussed. In section 3 the results (7) (8) 3
4 and discussion are presented, then finally conclusions are drawn in section 4.1 Apparatus and Techniques Apparatus The orifice plate used is part of SOLTEQ flowmeter measurement apparatus, model FM 101, shown in Figure 3. Figure 3: SOLTEQ flowmeter measurement apparatus, FM101. The SOLTEQ FM 101 flow meter apparatus consists of three different types of volume flowmeters. It contains a Venturi type flowmeter, an orifice plate flowmeter as well as a Rotameter. All flowmeters are connected in series. The apparatus also includes a flow control valve that can be used to adjust the volume flow rate. Water is allowed into the apparatus through the water inlet and is dumped through the water outlet as shown in Figure 3. The apparatus is connected to a TQ H10 Volumetric Bench, which contains a closed circuit water pump. The water exiting the FM 101 module is dumped in a collection tank and is pumped back into the water inlet. The SOLTEQ FM 101 also contains a multitube manometer to measure the difference in pressure across the Venturi and orifice plate flowmeters. The manometer has a range of 450 mm and the graduation is in 1 mm increments. The orifice plate flowmeter, shown in Figure 4(a), is fitted with two pressure taps located one tube diameter upstream of the orifice plate and half a tube diameter downstream the plate. The difference in these pressures is the required p in equation 8. The tube diameter, D, is equal to 6 mm while the orificemeter throat diameter, DT, is equal to 16 mm. Therefore the ratio of diameters, β, is β = DDT =
5 (a) Orifice plate flowmeter. (b) Rotameter. Figure 4: SOLTEQ FM101. Procedures and Techniques In this experiment, the SOLTEQ FM101 was connected to the TQ H10 Volumetric Bench. The flowrate was set at three different values 5, 10 and 15 L/min. This was done by adjusting the flow control valve. The volume flowrate value was read off the Rotameter. Before any measurements were taken, the flow was allowed to reach a steady condition such that there are no air bubbles in the system and all pressure readings were stable. Once the pressure readings in the manometer were stable and all air bubbles were out, the pressure measurements were recorded for each volume flowrate. Each time the valve position changed, the flow was allowed to stabilize before recording the new pressure readings. The measurements were repeated for the 10 L/min flowrate case for uncertainty estimates purposes. It is worth noting that reading the water height in the manometer was difficult due to the fact that the water used was clear and the background was white. 3 Results and Discussions In this section the results will be presented and discussed. The atmospheric pressure and temperature during the experiment were measured to be 940 ± 1.5 mbar and ± 1 C, respectively. Since the working fluid is water, the water temperature was measured to be 0 ± 1 C. The water density, ρ, and viscosity, µ, at this temperature were taken as 998. kg/m3 and 10 3 P a s, respectively, []. The pressure measurements upstream, p1, and downstream, p, of the orifice plate are shown in Table 1. Also shown in Table 1, are the average velocity U and the Reynolds 5
6 number, Re U defined as follows, U = Q A = 4Q πd (9) Re U = ρud µ (10) Where, ρ and µ are the water density and viscosity, respectively. Finally, using equation 8 Table 1: Pressure Measurement Q [L/min] p 1 [mm H O] p [mm H O] U [m/s] Re U C d we can write the coefficient of discharge, C d, as follows, C d = Q A ρ (1 β 4 ) (p 1 p ) (11) Equation 11 is used to calculate the values of C d shown in Table 1. The measured discharge coefficient values are close to the supplied value in the lab manual of While recording the pressure measurements it was noticed that there are some fluctuations in the pressure values. This might be due to the fact that the pipe length between the Venturimeter,and the orifice flowmeter is too short, less than three pipe diameters. This was amplified when the flow rate was set to 5L/min, which corresponds to a Re = This value is in the transition region, hence the flow is not fully turbulent. To get a better reading there should be longer pipe connecting the venturimeter and the orifice plate or the Reynolds number should be increased. In the next section the uncertainty in measured quantities is presented. 3.1 Uncertainty Analysis Uncertainty analysis is performed based on two readings of the pressure difference at 10 L/min flowrate. The values are listed in Table. Table : Pressure Measurement for uncertainty estimates at Q = 10 L/min Run 1 p S p p 1 [mm H O] p [mm H O] Where, p and S p are the mean and standard deviation of the measured pressures, respectively. The uncertainty in the measured pressure is given by U p = t p S α/,ν n, Where t is the tdistribution and α = 0.05 is the level of significance, and ν = n 1, where n = is the number of observations. Hence, the uncertainties in the upstream and downstream pressures 6
7 are given as follows, S p1 U p1 = t 0.05,1 n = = 6.35 mm H O (1) S p U p = t 0.05,1 n = = 1.71 mm H O (13) Using, equation 11 we can estimate the uncertainty in C d, U Cd, as follows, [4], U Cd = ( Cd Q U Q ) ( Cd + p 1 U p1 (14) ) ( ) Cd + U p (15) p The uncertianty in the measured flowrate is taken to be 4% F ull Scale, such that δq = 0.88 L/min. Using equation 11 and the calculated pressure and flowrate uncertainties we can evaluate the uncertainty in C d as U Cd = ± Since in general the discharge coefficient is a function of the Reynolds number, Re, a plot of the measured C d versus the Reynolds number is shown in Figure 5. Also shown in the figure is a curve fit for experimental data reported in the literature versus Re as given by equation 16, [1]. The length L 1 and L are the pressure taps locations upstream and downstream, respectively. In this case, L 1 = d 1 and L = d. Figure 5: Discharge coefficient versus Reynolds number. 7
8 C d = β β β.5 ( ( ) [ L1 β 4 ] D (1 β ) Re ( L D ) 0.75 ) β 3 (16) The measured coefficient of discharge is C d = 0.67 ± while the value supplied in the lab manual is This is about 6% difference. However, the measured values are within 4.5% from the empirical relation given by equation 16 for Q = 10, 15 L/min while the difference is 8% for the case Q = 5 L/min. This is probably due to the low Reynolds number which is in the transition region. To get higher accuracy we need to make more measurements with more accurate pressure transducers. 4 Conclusions In this work the discharge coefficient of an orifice plate flowmeter was estimated at three values of flow rate, Q = 5, 10 and 15 L/min. The measured values were compared with the values obtained from the lab manual and from a curve fit of empirical data. The following conclusions are made, The mean coefficient of discharge was estimated to be C d = 0.67 ± The difference between current measured C d and values in the literature are within experimental uncertainty Main source of uncertainty is the unsteadiness in pressure measurement. This is due to the fact that the Reynolds number is in the transition region for low values of flow rates The variation in C d versus the Reynolds number follows the curve fit of empirical data in the literature The results can be improved if a more accurate manometer is used as well as more data points are taken Using a very light dye in the water would improve will eliminate human reading errors References [1] Emperical fit for c d : [] Water properties: [3] Robert W. Fox Alan T. McDonald Philip J. Pritchard. Fluid Mechanics. John Wiley & Sons, eighth edition, 01. [4] Thomas G. Beckwith Roy D. Marangoni John H. Lienhard V. Mechanical Measurements. Addison Wesley, fifth edition,
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