Viscosity definitions and units
Viscosity - Definitions and measurement devices
Article REF: K478 V1
Viscosity definitions and units
Viscosity - Definitions and measurement devices

Author : Bernard LE NEINDRE

Publication date: May 10, 2004 | Lire en français

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1. Viscosity definitions and units

  • Dynamic or shear viscosity is based on fluid mechanics concepts.

    Consider two parallel horizontal plates (figure 1 ), which bound a fluid layer of thickness h. If the lower plate is stationary and the upper plate of area A moves parallel to this surface at a velocity v x , a force F per unit area A must be applied to maintain the displacement such that :

    FA=η(vxz)( 1 )

    ...
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