Surface dilation and fluid-dynamical behavior of newtonian liquids in an overflowing cylinder: I. Pure liquids

The surface dilational viscosity η s d relates the surface tension under dynamical conditions σ dyn to the relative surface expansion rate d ln A dt . The value of η s d can be determined by means of the overflowing cylinder technique. The dynamic surface tension is determined by the Wilhelmy plate...

Full description

Saved in:
Bibliographic Details
Published in:Journal of colloid and interface science 1990, Vol.138 (1), p.1-9
Main Authors: Bergink-Martens, D.J.M, Bos, H.J, Prins, A, Schulte, B.C
Format: Article
Language:English
Subjects:
Geïntegreerde levensmiddelentechnologie en -fysica
Integrated Food Science and Food Physics
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The surface dilational viscosity η s d relates the surface tension under dynamical conditions σ dyn to the relative surface expansion rate d ln A dt . The value of η s d can be determined by means of the overflowing cylinder technique. The dynamic surface tension is determined by the Wilhelmy plate technique. The key problem is to find the relation between the surface expansion rate and the flow field developed in the cylinder for a particular surface active liquid. In this paper calculated surface velocity distributions and surface expansion rates are compared to experimental results for a pure liquid. Moreover some experimental results show the large influence of the addition of surfactants on the surface expansion rate.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(90)90174-M