For steady state deformations a surface
shear viscosity
, and an area viscosity or surface dilatational
viscosity
can be defined. In a Cartesian system with the
x-axis normal to the surface, they are defined by the equations:
where
is the shear component of the
surface stress tensor,
and
are the
and
components of the surface velocity vector, respectively,
is the surface area,
is the time, and
is the difference between the (steady state)
dynamic surface tension and the equilibrium surface tension.
Source:
PAC, 1979, 51, 1213
(Manual of symbols and terminology for physicochemical quantities and units. Appendix
II: Definitions, terminology and symbols in colloid and surface chemistry. Part 1.13.
Selected definitions, terminology and symbols for rheological properties)
on page 1218
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
