Author:
HIRSA A. H.,LOPEZ J. M.,MIRAGHAIE R.
Abstract
Results of an experimental and computational study of the flow in an annular
region bounded by stationary inner and outer cylinders and driven by the rotation
of the floor are presented. The top is a flat air/water interface, covered by an
insoluble monolayer. We develop a technique to determine the surface shear viscosity
from azimuthal velocity measurements at the interface which extends the range of
surface shear viscosity that can be measured using a deep-channel viscometer in the
usual Stokes flow regime by exploiting flow inertia. A Navier–Stokes-based model
of bulk flow coupled to a Newtonian interface that has surface shear viscosity as
the only interfacial property is developed. This is achieved by restricting the flow to
regimes where the surface radial velocity vanishes. The use of inertia results in an
improved signal-to-noise ratio of the azimuthal velocity measurements by an order of
magnitude beyond that available in the Stokes flow limit. Measurements on vitamin
K1 and stearic acid monolayers were performed, and their surface shear viscosities
over a range of concentrations are determined and found to be in agreement with
data in the literature.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
42 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献