Preferred Label : volume viscosity;
Detailed label : volume viscosity (or dilatational viscosity);
IUPAC definition : A quantity ζ which enters into equations at any point where the flow involves a change
in volume, i.e. is dilatational. If the deformation is purely dilatational, the average
of three normal stress components is: \[σ \frac{1}{3}\ (σ _{xx} σ _{yy} σ _{zz})
- p \zeta \ (\frac{ v_{x}}{ x} \frac{ v_{y}}{ y} \frac{ v_{z}}{ z})\] where
p is the hydrostatic pressure at the point considered in the absence of motion.;
Origin ID : V06650;
See also
A quantity ζ which enters into equations at any point where the flow involves a change
in volume, i.e. is dilatational. If the deformation is purely dilatational, the average
of three normal stress components is: \[σ \frac{1}{3}\ (σ _{xx} σ _{yy} σ _{zz})
- p \zeta \ (\frac{ v_{x}}{ x} \frac{ v_{y}}{ y} \frac{ v_{z}}{ z})\] where
p is the hydrostatic pressure at the point considered in the absence of motion.
