Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)The effect of viscosity (high and low) and molecular characteristics (polar and nonpolar) of continuous matrix on the flow behavior of noncolloidal suspensions were evaluated using particles with different size and shape. The increase in solids volume fraction exerted higher influence for larger cellulose fibers and less viscous matrices, due to larger particle-particle interaction. Evaluation of matrix polarity allowed the assessment of particle-solvent interactions, indicating that higher swelling of particles dispersed in polar matrices led to more complex and viscous suspensions. Besides particle characteristics, suspending matrix properties influenced the rheological behavior of noncolloidal suspensions, despite of the prevailing hydrodynamics effects.3341699437446Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)CNPq [140463/2005-4, 301869/2006-5]