Steady-shear viscosity and transient stress response for elasto-thixotropic fluids |
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| Authors: | Fang Tunan Carlos Tiu |
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| Affiliation: | (1) Deparment of Chemical Engineering, East China University of Chemical Technology, Shanghai, China;(2) Department of Chemical Engineering, Monash University, 3168 Clayton, Victoria, Australia |
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| Abstract: | A phenomenological model for dispersed systems which exhibit complex rheological behaviour such as shear and time-dependent viscosity, yield stress, and elasticity is proposed. The model extends the Quemeda model to describe the viscosity function with a structural parameter λ which varies according to different kinetic orders of particle aggregation and segregation. The transient stress response is obtained by solving an instantaneous Maxwell model with an assumed shear modulus functionG of the same form as the viscosity function η. Accuracy of the proposed model is verified experimentally with the results obtained for two oil (creosote)/water emulsions. The model that gives the best fit of experimental data appears to be the one with kinetic ordersn=m=2. |
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| Keywords: | elasto-thixotropic fluid rheological model steady-shear viscosity transient stress response |
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