ABSTRACT
At handling of cohesive powders vibrating discharge devices are commonly used. But such devices are often not located at where the flow problems (bridging, channeling) occur. The wave propagation of these vibrations is damped by viscous and/or frictional effects. In order to quantify this damping behavior, ultrafine cohesive powders were examined using a vibrating shear tester. Mechanical vibrations are directly applied into the shear zone, the shear resistance is reduced by this additional energy input.
