Viscosity
From The Art and Popular Culture Encyclopedia
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I am the fly, the fly in the ointment --"I Am the Fly" (1978) by Wire "Sartre developed a squeamishness about viscosity or gluey sliminess (he expressed disgust at the “moist and feminine sucking” that occurs when a sticky substance sticks to fingers) that led to his use of the term “viscosity” to express his horror of contingency."--At the Existentialist Café (2016) by Sarah Bakewell |
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The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress or tensile stress.
Viscosity is a property arising from collisions between neighboring particles in a fluid that are moving at different velocities. 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. For the same velocity pattern, the stress required is proportional to the fluid's viscosity.
A fluid that has no resistance to shear stress is known as an ideal or inviscid fluid. Zero viscosity is observed only at very low temperatures in superfluids. Otherwise, all fluids have positive viscosity, and are technically said to be viscous or viscid. 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. A fluid with a relatively high viscosity, for example, pitch, may appear to be a solid.
See also
- Dashpot
- Deborah number
- Dilatant
- Herschel–Bulkley fluid
- Hyperviscosity syndrome
- Intrinsic viscosity
- Inviscid flow
- Morton number
- Relative viscosity
- Reyn
- Reynolds number
- Trouton's ratio
- Two-dimensional point vortex gas
- Viscoelasticity
- Viscoplasticity
- Viscosity index
- Joback method (estimation of the liquid viscosity from molecular structure)
- Microviscosity
- Rheology
- Superfluid helium-4
- Sartre
- Stokes flow
