In this study, flow characteristics of rigid particle suspensions are derived theoretically based on the model which assumes particle collision-induced momentum transport. The theoretical equation predicts a linear increase of viscosity with shear rate, viz., shear thickening behavior of the suspension. Further, the increase of viscosity is expected to be proportional to the square of volume fraction of particles, and to show the theoretical linear dependency on density and diameter of particle. For verification of the theory, the experimental results of Clarke (1967) are utilized since the parameters were varied independently in his study. The derived equation has only one experimental constant. It is confirmed that a unique value of it could correlate the viscosity dependency on all factors under some experimental condition ranges. Further, it is suggested that usage of the value which corresponding to particle shape promises wide application of the derived flow characteristics equation.