Propriedades reológicas de suspensões de alumina em fluidos newtonianos de alta viscosidade.

Abstract

Rhelogical properties of several suspensions of multgear-aluniina have been studied in the present work, at the rate of 5, 10, 15, 20, 25, 30, 35 and 40 grams for each 100 ml of fluid, varying the speeds and times of homogenization at ambient temperature. The effect of the concentration, as well as the stirring speed and time over the rheologicals proprieties, were investigated mainly through parameters, like viscosity apparent, consistency index and power index. All the analyzed suspensions showed newtonian behavior for concentrations less than 10g/100ml, being such concentration named critic concentration. Concentrations greater than this showed non-newtonian behavior. The obtained results also show that at the studied conditions, above the critical concentration, the suspensions acquire pseudoplastic behavoir, showing higler evidence as the concentration increases. Mathematical models showing a good agreement with the experimental data.