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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2013, 1, 55—64.

Non-Newtonian Flow of Structured Systems. III. Physical Meaning of χ Coefficient

E. A. Kirsanov, Yu. N. Timoshin

Author affiliations Moscow State Region Socio-Humanitarian Institute
Zelenaya st., 30, 140410 Kolomna, Moscow Region, Russia. E-mail: Kirsanov47@mail.ru

Abstract The shear viscosity of monodisperse suspensions and binary mixtures of polystyrene latexes are described in the frames of a generalized flow model. The good agreement between the experimental and calculated values was obtained with the help of the generalized flow equation. The coefficient is η_{c} independent of the concentration ratio between the parts of latex 141 and latex 84 at a constant total volume concentration of latex. The coefficient τ_{c} increases with increasing the ratio between the parts at transition from large to small particles. The coefficient χ has the minimum value at middle concentration ratio of latex 141 to latex 84. The minimum of zero shear viscosity is the result of a more efficient packing of polydisperse spheres in aggregate.

Keywords: bimodal suspension rheology, generalized flow model