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  2. Viscosity - Wikipedia

    en.wikipedia.org/wiki/Viscosity

    Viscosity is the material property which relates the viscous stresses in a material to the rate of change of a deformation (the strain rate). Although it applies to general flows, it is easy to visualize and define in a simple shearing flow, such as a planar Couette flow .

  3. List of viscosities - Wikipedia

    en.wikipedia.org/wiki/List_of_viscosities

    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.

  4. Viscoelasticity - Wikipedia

    en.wikipedia.org/wiki/Viscoelasticity

    If the material exhibits a non-linear response to the strain rate, it is categorized as non-Newtonian fluid. There is also an interesting case where the viscosity decreases as the shear/strain rate remains constant. A material which exhibits this type of behavior is known as thixotropic.

  5. Viscosity models for mixtures - Wikipedia

    en.wikipedia.org/wiki/Viscosity_models_for_mixtures

    The shear viscosity (or viscosity, in short) of a fluid is a material property that describes the friction between internal neighboring fluid surfaces (or sheets) flowing with different fluid velocities. This friction is the effect of (linear) momentum exchange caused by molecules with sufficient energy to move (or "to jump") between these ...

  6. Viscous stress tensor - Wikipedia

    en.wikipedia.org/wiki/Viscous_stress_tensor

    The viscosity coefficient μ is a property of a Newtonian material that, by definition, does not depend otherwise on v or σ. The strain rate tensor E(p, t) is symmetric by definition, so it has only six linearly independent elements. Therefore, the viscosity tensor μ has only 6 × 9 = 54 degrees of freedom rather than 81. In most fluids the ...

  7. Viscoplasticity - Wikipedia

    en.wikipedia.org/wiki/Viscoplasticity

    In viscoplastic materials, relaxation tests demonstrate the stress relaxation in uniaxial loading at a constant strain. In fact, these tests characterize the viscosity and can be used to determine the relation which exists between the stress and the rate of viscoplastic strain. The decomposition of strain rate is

  8. Viscous liquid - Wikipedia

    en.wikipedia.org/wiki/Viscous_liquid

    Bond breaking modifies the properties of an amorphous material so that the higher the concentration of broken bonds termed configurons the lower the viscosity. Materials with a higher enthalpy of configuron formation compared with their enthalpy of motion have a higher Doremus fragility ratio, conversely melts with a relatively lower enthalpy ...

  9. Volume viscosity - Wikipedia

    en.wikipedia.org/wiki/Volume_viscosity

    Volume viscosity (also called bulk viscosity, or second viscosity or, dilatational viscosity) is a material property relevant for characterizing fluid flow. Common symbols are ζ , μ ′ , μ b , κ {\displaystyle \zeta ,\mu ',\mu _{\mathrm {b} },\kappa } or ξ {\displaystyle \xi } .