Mixture theory based approach to find the effective viscosity. A schematic showing the the mixture theory approach of estimating the effective viscosity of a 2-species suspension containing the pure solvent (L), species 1(S1) and species 2(S2) by means of a weighted average of the indivdual constituents of the suspension. The tube 2 contains the pure solvent L of viscosity η0; tube 3 contains S1 floating in a medium composed L and S2 and is of viscosity η1; tube 4 contains S2 in a medium composed of L and S1 which is of viscosity η2. By taking appropriate volumes from tubes 2,3 and 4, we prepare the suspension in tube 1 which now contains L, S1 and S2 which has an effective viscosity η
defined in equation (16).