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Viscosity is a measure of a fluid's rate-dependent resistance to a change in shape or to movement of its neighboring portions relative to one another. [1] For liquids, it corresponds to the informal concept of thickness; for example, syrup has a higher viscosity than water. [2]
In physics and chemistry, a non-Newtonian fluid is a fluid that does not follow Newton's law of viscosity, that is, it has variable viscosity dependent on stress. In particular, the viscosity of non-Newtonian fluids can change when subjected to force. Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid.
Dynamic viscosity is a material property which describes the resistance of a fluid to shearing flows. It corresponds roughly to the intuitive notion of a fluid's 'thickness'. For instance, honey has a much higher viscosity than water. Viscosity is measured using a viscometer. Measured values span several orders of magnitude.
The higher the viscosity, the larger the damping imposed on the resonator. The resonator's damping may be measured by one of several methods: Measuring the power input necessary to keep the oscillator vibrating at a constant amplitude. The higher the viscosity, the more power is needed to maintain the amplitude of oscillation.
Shear thinning in a polymeric system: dependence of apparent viscosity on shear rate. η 0 is the zero shear rate viscosity and η ∞ is the infinite shear viscosity plateau. At both sufficiently high and very low shear rates, viscosity of a polymer system is independent of the shear rate.
The CGS unit of kinematic viscosity was named "stokes" after his work. Applications. Stokes' law is the basis of the falling-sphere viscometer, in which the fluid is ...
This ER fluid clearly cannot work by the water bridge model. However, although demonstrating that some ER fluids work by the electrostatic effect, it does not prove that all ER fluids do so. The advantage of having an ER fluid which operates on the electrostatic effect is the elimination of leakage current, i.e. potentially there is no direct ...
Volume viscosity was introduced in 1879 by Sir Horace Lamb in his famous work Hydrodynamics. [5] Although relatively obscure in the scientific literature at large, volume viscosity is discussed in depth in many important works on fluid mechanics, [ 1 ] [ 6 ] [ 7 ] fluid acoustics, [ 8 ] [ 9 ] [ 10 ] [ 2 ] theory of liquids, [ 11 ] [ 12 ...