Surface dilation and fluiddynamical behaviour of Newtonian liquids in an overflowing cylinder. 1: Pure liquids
Abstract
The surface dilational viscosity relates the surface tension under dynamical conditions to the relative surface expansion rate. The value of this viscosity 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. Calculated surface velocity distributions and surface expansion rates are compared to experimental results for a pure liquid. Some experimental results show the large influence of the addition of surfactants on the surface expansion rate.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 August 1989
 Bibcode:
 1989STIN...9025317B
 Keywords:

 Cylindrical Tanks;
 Flow Distribution;
 Newtonian Fluids;
 Surface Properties;
 Velocity Distribution;
 Finite Difference Theory;
 Interfacial Tension;
 Laplace Transformation;
 NavierStokes Equation;
 Viscosity;
 Fluid Mechanics and Heat Transfer