Liquid Viscosity - 1 Falling Ball Method Objective a To...

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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 48.5 48.3 48.4 15 12.65 11.70 12.45 25 5.3 5.4 5.2 By using the following Equation, we determine Vs (viscosity): Vs = [2.g.r 2 .(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 = 7.78X10 3 ) (den water = 0.998 X 10 3 ), ( 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 y = 0.0001x + 0.0035 0.0033 0.00335 0.0034 0.00345 0.0035 0.00355 0.0036 0.00365 0.0037 -1 -0.5 0 0.5 1 1.5 2 1/T ln ( mu Here, Slope = E / R = 0.0001 E = 8.314 X 10 –4 Kj
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2- Ostwald Viscometer:
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