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19_Viscosity

19_Viscosity - INDIANA UNIVERSITY DEPARTMENT OF PHYSICS...

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INDIANA UNIVERSITY, DEPARTMENT OF PHYSICS, P309 LABORATORY Laboratory #19: Viscosity Goal: Measure the temperature dependence of the viscosity of water. Equipment: Coffeepot viscometer, assorted capillaries, thermometer, plastic trays, graduated glass cylinder. (A) Physics: When, in the flow of a real fluid, adjacent "layers" move with different velocities, there are frictional forces that oppose this motion. Thus, some of the flow energy is dissipated. The quantity that describes to what extent this happens in a certain fluid is called viscosity. The viscosity depends on temperature, density, and pressure (in so-called non-Newtonian fluids, the viscosity also depends on other factors (for instance, so-called thixotropic liquids such as ketchup and concrete have a lower viscosity when they are agitated). Attempts to calculate viscosities from the statistical properties of the fluid are successful only for simple fluids (such as noble gases at low pressure). For these simple fluids, one finds that the viscosity increases with increasing temperature. For most liquids, however, the temperature dependence is opposite, and the viscosity decreases with temperature (see fig.1). This is not yet understood. Good sources to learn more about viscosity are
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