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Fluid in porous media flows through tortuous paths. When the fluid velocities are large enough, this tortuosity and inertial effects cause suspended particles to collide with pore walls. After each collision, a particle loses momentum and needs to be accelerated again by hydrodynamic forces. As a result, the average velocity of suspended particles may be smaller than that of the fluid. In addition, if the fluid velocity field is not macroscopically homogeneous, the retardation of the particlesdoi:10.1137/090780687 fatcat:z23dfln24zgvxdj7e5iizhlj4u