Apparent Wall Slip (AWS) Viscometry - Influence of the Sensor's Surface.

0380062 - ÚCHP 2013 PT eng C - Conference Paper (international conference)
Pěnkavová, Věra - Tihon, Jaroslav - Večeř, M. - Wein, Ondřej
Apparent Wall Slip (AWS) Viscometry - Influence of the Sensor's Surface.
Book of Abstracts. -: -, 2012, s. 36. ISBN N. ISSN 1877-7058.
[International Congress on Rheology /16./. Lisbon (PT), 05.08.2012-10.08.2012]
R&D Projects: GA ČR GAP102/12/2043
Institutional support: RVO:67985858
Keywords : AWS viscometry * microdisperse liquids * influence of sensor's surface
Subject RIV: CI - Industrial Chemistry, Chemical Engineering

Apparent wall slip (AWS) can affect the flow of microdisperse liquids in narrow channels. This phenomenon is characterized by the Navier slip coefficient in addition to the fluidity. A series of measurements at a given wall shear stress and varying gap thickness is necessary to separate the slip and fluidity effect. Organizing such a complex viscometric experiment over a span of shear stresses is the task for AWS viscometry. In this experimental study, the four KK viscometric sensors with different surface quality and the special statistical software AWSWork are used to determine the slip coefficients of aqueous kaolin dispersions. All the dispersions display some extent of the AWS effect, which is more pronounced at low shear stresses. The sensor’s surface does play important role. The artificial surface roughness suppresses the AWS effect which is, however, still discernible.
Permanent Link: http://hdl.handle.net/11104/0210879