Liquid Viscosity - 1- Falling Ball Method: * Objective: a....

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Unformatted text preview: 1- Falling Ball Method: * Objective: a. To determine the viscosity of glycerol. b. To determine the activation energy of viscus flow. * Experimental Procedure: As explained in the textbook pp93-100 * Data & Results: 0 15 25 48.5 12.65 5.3 48.3 11.70 5.4 48.4 12.45 5.2 By using the following Equation, we determine Vs (viscosity): Vs = [2.g.r2.(den ball – den liq).(1 – 2.104 r/R)] /9.v With the following parameters: ( g = 9.8 ), (r = d/2 = 3/32 inches = 1.175X10-3 ), (den ball = 7.78X103) (den water = 0.998 X 103), ( R = 2.25 X 10-2), ( v = x / t ) * Viscosity @ 0 C (v = 0.2/48.3 = 0.00414 m/s): Viscosity = 4.395 kg /m.s * Viscosity @ 15 C (v = 0.2/12.27 = 0.0163 m/s): Viscosity = 1.116 kg /m.s * Viscosity @ 25 C (v = 0.2/5.3 = 0.0377 m/s): Viscosity = 0.4826 kg /m.s 0. 0037 0. 00365 0. 0036 0. 00355 0. 0035 0. 00345 0. 0034 0. 00335 0. 0033 -0. 5 0 y = 0. 0001x + 0. 0035 ln ( mu -1 ) 0. 5 1/ T 1 1. 5 2 Here, Slope = E / R = 0.0001 E = 8.314 X 10 –4 Kj 2- Ostwald Viscometer: a. To determine the viscosities of a series of normal alcohols. b. Compare accuracy in both methods used in Part I and II. * Experimental Procedure: As explained in the book * Data & Results: Chemical Methanol Ethanol Heptane Hexane 36.4 195.9 312.6 370.3 H2O 116.6 116.6 135 135 Viscosity of Water at bath = 1.0050 cp = 0.001 kg/m.s For water, Vis = A.den.t A = Vis / den.t For First two trials: A1= 8.58 X 10-9 For Last two trials: A2= 7.41 X 10-9 Chemical Methanol Ethanol Heptane Hexane Using the following Eq. : Vis = A.den.t Chemical Methanol Ethanol Heptane Hexanel Density (g/cm3) 9.972 9.209 0.804 0.810 Viscosity (kg/m.s) 3.11 X 10-3 0.0155 1.86 X 10-3 2.22 X 10-3 * References: “Handbook of Chemistry and Physics,” 70th Ed., Pages F4-5, C42-553, F11-46, F40. CRC Press, Boca Raton, Florida (1989-90) ...
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This note was uploaded on 04/13/2011 for the course CHEM 311 taught by Professor Alial-habib during the Fall '09 term at King Fahd University of Petroleum & Minerals.

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Liquid Viscosity - 1- Falling Ball Method: * Objective: a....

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