B. Martin et Xi. Wu, SHEAR-FLOW IN A 2-DIMENSIONAL COUETTE CELL - A TECHNIQUE FOR MEASURING THE VISCOSITY OF FREESTANDING LIQUID-FILMS, Review of scientific instruments, 66(12), 1995, pp. 5603-5608
A two-dimensional shear viscometer has been constructed and tested usi
ng free-standing liquid soap films. The viscometer, which is an analog
of a three-dimensional Couette cell, consists of an inner rotating di
sk and an outer stationary ring. The viscosity of the liquid films can
be reliably obtained by measuring either the transient response of th
e disk upon a stepwise increment of the applied stress on the disk, or
by measuring the strain-stress relation in the steady state. The desi
gn can be easily modified to accommodate other types of flow which are
useful for investigating hydrodynamic and theological behavior in a v
ariety of thin films, such as liquid crystal and polymer films. (C) 19
95 American Institute of Physics.