Lab report son hali - Middle East Technical University...

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Middle East Technical University Chemical Engineering Department ChE 320 Chemical Engineering Laboratory I VISCOSITY MEASUREMENT TECHNIQUES EXP–7 By GROUP T-9 Submitted by: Ceyda PEKER Ozan Tevfik ŞAKAKLI Mert ÖZGENÇ Submitted to: Assoc. Prof. Dr. Gürkan KARAKAŞ Experiment Performed: March 13, 2007 Report Submitted: March 20, 2007
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TABLE OF CONTENTS 1. Introduction 4 1.1.Capillary Flow Method (The Ostwald-Fenske Viscometer) 5 1.2. Falling Ball Method (Hoeppler) 5 1.3. Rotating Shaft Viscometer (Haake) 6 2. Experimental Methods 7 2.1.Capillary Flow Method (The Ostwald-Fenske Viscometer) 7 .2.2Falling Ball Method (Hoeppler) 8 2.3.Rotating Shaft Viscometer (Haake) 8 3. Results 9 3.1. Capillary Flow Method (The Ostwald-Fenske Viscometer) 9 3.2. Falling Ball Method (Hoeppler) 13 3.3. Rotating Shaft Viscometer (Haake) 13 4. Discussion 14 5. Conclusion 16 6. Reference 17 7. Appendix 18 2
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ABSTRACT In this experiment, we aim to find the viscosities of glyrecol solutions with different concentrations, at different temperatures. We used three methods to determine these viscosities. The first method is capillary flow method in which we measured the time of a liquid volume flowing down in the capillary tube. The Ostwald – Fenske viscometer, which has two bulbs and two arms, is used for capillary flow method. In the falling ball method we measured the time of falling down of a spherical ball in a liquid. We used a tube which had marks to help us by the measurement. As the third method, we used the rotating shaft viscometer to make the measurement directly. Rotating shaft viscometer is an equipment which has a pointer on it that helps to read the value of the fluid directly on the scale. In the capillary flow method and falling ball method, we first used water as a fluid to help us evaluate the viscometer constant and ball constant with its known viscosity and density. Then we made the experiments with glycerol. In the capillary flow method we found the viscosities of 20% glycerol solution as 1553.75 ×10 -6 , 719.35×10 -6 , 500.52×10 -6 Pa.s ; of 40% glycerol solution as 2349.5×10 -6 , 1161.78×10 -6 , 734.80×10 -6 Pa.s; of 60% glycerol solution as 6940.18×10 -6 , 2466.22×10 -6 , 1293.95×10 -6 Pa.s at 27, 50 and 70 dergrees celcius respectively. In the falling ball method we found the viscosity of 20% solution at 27 degrees celcius as 970.9×10 -6 Pa.s. We read the viscosity of 20% solution as 1920×10 -6 Pa.s from the rotating shaft viscometer. We concluded that viscosity of glycerol solution decreases with increasing temperature and increases with increasing concentration of glycerol. 3
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NOMENCLATURE Symbol Definition SI Units μ Viscosity kg / m.s ρ Density kg / m 3 A Constant for a given viscometer m 2 / s 2 B Ball constant m 2 / s 2 P Pressure drop kg / m.s 2 V Volume m 3 L Length m t Time s t av Average time s 4
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1. INTRODUCTION During the flow of a fluid, an internal force occurs to resist the flow. Viscosity is a term used for the measurement of this resistance. An applied shear force is resisted by this
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This note was uploaded on 05/01/2011 for the course CHE che 320 taught by Professor Ahmetarslan during the Spring '11 term at Middle East Technical University.

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Lab report son hali - Middle East Technical University...

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