The Measurement of the Coefficient of Viscosity By Means of the Forced Vibration
The Measurement of the Coefficient of Viscosity By Means of the Forced Vibration
George F George Francis Mcewen
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[VOL. XXXIII t = 22. 10 . 792 cm. /?, , 2 = 8. 63 w = 1. 73. N ^n R n * V ^ B^K 1 2. 862 8. 191 3. 155 7 1. 513 2. 289 3. 142 11 . 9500 . 9025 3. 160 17 . 5962 . 3555 3. 162 1 i 3. 155 1, 248 The coefficient of viscosity was not computed from the preceding data, because the cylinder was not large enough compared to the spheres for the assumption of a cylinder of infinite radius to be valid for a fluid having such a large coefficient of viscosity. However, the above trials show that the method a...dopted can be successfully applied, even to the measurement of very large frictional forces. The apparatus, used in the experiment just described, was not well adapted to the measurement of small forces acting on the sphere, because of its crudeness, and because the friction in the apparatus itself was com- paratively large. But in order to test the method through a wide range of conditions, an attempt was made to determine the coefficient of viscosity of water. In this experiment the sphere was suspended close to the point C of the lower bar, in order to increase the effect of the fric- tional force.
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