Bulk Fluidity and Apparent Wall Slip of Aqueous Kaolin Suspensions Studied Using the Cone-Cone (KK) Sensor: Effect of the Sensor Surface Quality.

0478160 - ÚCHP 2018 RIV NL eng J - Journal Article
Pěnkavová, Věra - Tihon, Jaroslav - Wein, Ondřej
Bulk Fluidity and Apparent Wall Slip of Aqueous Kaolin Suspensions Studied Using the Cone-Cone (KK) Sensor: Effect of the Sensor Surface Quality.
Colloids and Surfaces A-Physicochemical and Engineering Aspects. Roč. 533, NOV 20 (2017), s. 338-346. ISSN 0927-7757. E-ISSN 1873-4359
EU Projects: Foundation for Science and Technology(XE) MP1305
Institutional support: RVO:67985858
Keywords : aqueous kaolin suspensions * rotational AWS viscometry * apparent wall slip
OECD category: Chemical process engineering
Impact factor: 2.829, year: 2017

Influence of sensor surface quality on apparent wall slip (AWS) effects in aqueous kaolin suspensions was studied using AWS rotational viscometry with four unconventional cone-cone (KK) sensors of different materials and surface finishing. The fluidity φ[σ] and slip χ[σ] material functions were obtained for three concentrations of kaolin (30, 35, and 40 wt.%) applying several gap thicknesses (between 0.6 and 1.6 mm). Positive slip coefficients were found in the sensors made from titanium or stainless steel with smooth or sand-blasted surfaces. A negative AWS effect was detected for the sensor made of aluminum alloy with eloxal coated surfaces. This negative AWS effect is interpreted as a consequence of possible formation of a stagnant layer at the walls.
Permanent Link: http://hdl.handle.net/11104/0274791