SHEAR-FLOW IN A 2-DIMENSIONAL COUETTE CELL - A TECHNIQUE FOR MEASURING THE VISCOSITY OF FREESTANDING LIQUID-FILMS

Authors
Citation
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
Citations number
19
Categorie Soggetti
Physics, Applied","Instument & Instrumentation
ISSN journal
00346748
Volume
66
Issue
12
Year of publication
1995
Pages
5603 - 5608
Database
ISI
SICI code
0034-6748(1995)66:12<5603:SIA2CC>2.0.ZU;2-9
Abstract
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.