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Unformatted text preview: MIDDLE EAST TECHNICAL UNIVERSITY Department of Chemical Engineering Chemical Engineering Laboratory 1 Ch.E. 320 Flowmeters and Pressure Drop For a Flow System EXP1 By Group T1 Group Members : Merve ALAYAN Didem POLAT rem BALCI Gonca BACANLI Ayem ALAR Submitted to : Prof. Dr. Timur DOU Experiment Performed : March 6, 2007 Report Submitted : March 14, 2007 ABSTRACT The aim of this experiment was to obtain coefficients for flow nozzle, pitot tube, orificemeter and rotameter and plot the calibration curves of these flowmeters. In addition, it was aimed to calculate the change in pressure along a special rough pipe by using tap water with different flow rates. For the calculations of the flowmeter coefficients, Bernoulli equation is used by making the suitable assumptions and equation for each flowmeter is obtained. After calculating the coefficients for each flow rate and taking the average of this values, the log (m) vs log (h) graphs were plotted for calibration. For orificemeter C o is found as 0,54 , for nozzle C N is 0,73. The slopes of these graphs are nearly 0.5 as they are expected. Since the coefficient of the pitot tube is known, maximum velocity is calculated from pitot tube equation for each flow rate. Finally, friction factor values were calculated for the rough pipe and also from average velocities Reynolds numbers were obtained for different flow rates. Roughness was again calculated from our datas and it was found 0.051. Since friction factor is a function of Reynolds number log (f) vs log (Re) graph was plotted compared with the literature data on the graph. TABLE OF CONTENTS NOMENCLATURE 2 1. INTRODUCTION 4 1.1 GENERAL EQUATIONS 4 1.2 UTUBE MANOMETER 5 1.3 ORIFICE METER 6 1.4 PITOT TUBE 7 1.5 FLOW NOZZLE 8 1.6 ROTAMETER 9 2. EXPERIMENTAL 12 3. RESULTS 14 3.1 CALIBRATION CURVES 14 3.2 CALCULATION OF COEFFICIENTS 20 3.3 PRESSURE DROP ALONG THE ROUGH TUBE 22 3.4 CALCULATION OF REYNOLDS NUMBER AND FRICTION FACTOR 23 3.5 ROUGHNESS OF THE PIPE 25 4. DISCUSSION 26 5. CONCLUSION 29 6. REFERENCES 30 7. APPENDICES 7.1 SAMPLE CALCULATIONS 30 7.2 EXPERIMENTAL DATA 37 1 NOMENCLATURE Symbol Definition Units m & t v D Re f P l C n C o v max Q A n A o D n D o P g h Mass flow rate Time Average velocity Diameter of pipe Reynolds number Friction factor Pressure Inclined manometer reading Correction factor of nozzle meter Correction factor of orifice meter Maximum velocity Volumetric flow rate Cross section area of nozzle meter Cross section area of orifice meter Diameter of nozzle meter Diameter of orifice meter Pressure drop Gravitational acceleration Height of manometer kg/s s m/s m Pa m m/s m 3 /s m 2 m 2 m m Pa m/s 2 m 2 Greek Symbols A Abbreviations or noz pit max Angle of inclined manometer Density of water Density of CCl 4 Viscosity Roughness Orifice Nozzle pitot maximum kg/m 3 kg/m 3 N.s/m 2 mm 3 1.INTRODUCTION In factories it is usually one of the most important thing is to measure the flow rate in various pipes. In industries, many of the materials that are used in flow rate in various pipes....
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 Spring '11
 ahmetarslan
 Chemical Engineering

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