Dynamic coefficient of friction and granular drag force in dense particle flows: Experiments and DEM simulations

The vertical granular drag force on objects held stationary in a moving bed of nickel pellets with diameters in the range 1–10mm has been measured and compared with Discrete Element Method (DEM) simulations. Experiments were carried out with horizontal wooden rods, and horizontal and vertical thin plates made of mild steel or Teflon. The experimental data are correlated by semi-empirical equations based on the “supported mass” of pellets in the …