Viscous Forces

Fluids, like other forms of matter, resist movement. Part of the resistance is explained by pressure:
Viscous Forces
p yp
this part is reversible. The rest is irreversible: when fluids move, there is some loss. This is
attributed to "viscosity."
There must be some relation between stress and strain.
In solids, stress is a function of strain. In the simplest case, stress is directly proportional to strain

Fluids don’t resist shear strain if applied slowly. The resistance is to the
rate of strain. Thus, ideally ( this is called “Newtonian Fluid”), in fluids,
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y )
stress is proportional to Rate of Strain. The proportionality constant is called Absolute Viscosity

Viscous stress and rate of strain

 

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