Our disk model uses a quasi-linear viscosity parameterization that does not extrapolate well into the impending regime of extreme mass transfer. A fluid with a relatively high viscosity, such as pitch, may appear to be a solid. In common parlance, however, a liquid is said to be viscous if its viscosity is substantially greater than that of water, and may be described as mobile if the viscosity is noticeably less than water.
Otherwise, all fluids have positive viscosity, and are technically said to be viscous or viscid. Zero viscosity is observed only at very low temperatures in superfluids. For a given velocity pattern, the stress required is proportional to the fluid's viscosity.Ī fluid that has no resistance to shear stress is known as an ideal or inviscid fluid. When the fluid is forced through a tube, the particles which compose the fluid generally move more quickly near the tube's axis and more slowly near its walls therefore some stress (such as a pressure difference between the two ends of the tube) is needed to overcome the friction between particle layers to keep the fluid moving. Viscosity is a property arising from collisions between neighboring particles in a fluid that are moving at different velocities. For liquids, it corresponds to the informal concept of "thickness" for example, honey has a much higher viscosity than water. The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.
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