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2. Viscosity
Viscosity is the criterion that differentiates a real fluid from a perfect fluid. It is the cause of internal friction, which leads to the dissipation of mechanical energy into heat.
2.1 Experimental demonstration
Viscosity can be defined from the following experiment (figure 1 ). Consider a real fluid contained between two very large parallel planes, one of which is fixed and the other moving with velocityV. To keep the velocityV of the plate constant, it is necessary to apply a forceF parallel to the planes. For some fluids, as long asV remains below a critical value,...
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Viscosity
Kinematics of fluid flow
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