The knowledge of strain distributions of granular materials is required in various kinds of particle handling processes in chemical, ceramic, food processing and other related industries. However, it is very difficult t.o obtain such a knowledge as compared with the case of fluids . If WC want to obtain a velocity distribution of a gas or liquid flow, we can utilize the Navier-Stokes equation.We have had, however, no basic equations for the corresponding calculation of granular materials. The aim of this paper, is therefore, to derive a new equation for granular materials like the Navier-Stokes equation for fluids.
I will derive a new simple equation for obtaining the strain-distribution based on the classical hydrodynamics. Then, the equation will be applied to simple one-dimmensional problem, and compared with the experimental results.