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# viscosity - The Falling Ball Method makes use of the Stokes...

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4.0 RESULT 4.1 Capillary - Flow Method (The Ostwald-Fenske Viscometer): The Capillary Flow Method makes use of Hagen-Poiseuille equation for the determination of liquid velocities. We have to make calibration in order to find the A constant in the equation µ = A.ρ.t . Therefore we use water with known viscosity and density, prepare the Table 1 which includes the A constants. We take average value of A constants and use A avg. = 1.35*10 -7 when calculating glycerin-water solution viscosities. We calculate viscosities and kinematic viscosities for 40% (V/V) glycerin-water solution by using again Hagen-Poiseuille equation, Table 2 shows the values found. 7 Table 1: Datas for Calibrating A constant T water (K) ρ water (kg / m 3 ) µ water * 10 3 (Pa.s) t avg. (s) A * 10 7 (m 2 /s 2 ) 303 995.6 0.803 4.93 1.636 323 988.1 0.550 4.20 1.325 343 977.8 0.408 3.83 1.089 Table 2: Experimental results on capillary flow method T water (K) ρ glycerin (kg / m 3 ) t avg. (s) µ glyce. * 10 3 (Pa.s) ν * 10 6 (m 2 /s) 303 1109 11.86 1.776 1.601 323 1099 7.43 1.102 1.003 343 1089 5.70 0.838 0.769

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4.2 Falling Ball Method (Hoeppler):
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Unformatted text preview: The Falling Ball Method makes use of the Stokes formula for determination of liquid viscosities. We use the formula “µ = t.( ρ b – ρ r ).B” for calculating viscosities of 20%, 40% and 60% (V/V) glycerin-water solutions. We use Ball 1 for this experiment which has properties of ρ b = 2.392 and B = 0.3325. We prepare Table 3 by using glycerin-water solution properties at 298 K. 4.3 Rotating Shaft Viscometer (HAAKE): Rotating Shaft Viscometers are used for fast comparison tests on liquid viscosities. In this experiment, we use a viscometer with rotor 4 for finding viscosity of 40% (V/V) glycerin-water solution. We read the viscosity value as µ glycerin = 4.17*10-3 Pa.s 8 Table 3: Experimental results on falling ball method (V/V) % ρ glycerin (kg / m 3 ) t avg. (s) µ glyce. * 10 3 (Pa.s) ν * 10 6 (m 2 /s) 20 1040 4.53 2.04 1.962 40 1108 7.40 3.16 2.852 60 1180 21.9 8.83 7.483...
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viscosity - The Falling Ball Method makes use of the Stokes...

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