High-speed measurement of axial grain transport in a rotating drum

Continuum theory of axial segregation in a long rotating drum.

We develop a continuum description for the axial segregation of granular materials in a long rotating drum based on the dynamics of the thin near-surface granular flow coupled to bulk flow. The equations of motion are reduced to the one-dimensional system for two local variables only, the concentration difference and the dynamic angle of repose, or the average slope of the free surface. The par...

Mechanisms for Axial Band Formation in a Rotating Drum of Granular Material

Title of dissertation: MECHANISMS FOR AXIAL BAND FORMATION IN A ROTATING DRUM OF GRANULAR MATERIAL Michael K. Newey, Doctor of Philosophy, 2006 Dissertation directed by: Professor Wolfgang Losert Department of Physics We study granular particles, like sand or glass beads, that are mixed in a partially filled, horizontal, cylindrical drum. When the drum is rotated, it is observed that there is a...

Subdiffusive axial transport of granular materials in a long drum mixer.

Granular mixtures segregate radially by size when tumbled in a partially filled horizontal drum. The smaller component moves toward the axis of rotation and forms a buried core, which then splits into axial bands. Models have generally assumed that the axial segregation is opposed by diffusion. Using narrow pulses of the smaller component as initial conditions, we have characterized axial trans...

effect of paddy moisture content, drum speed and feed rate on the qualitative losses in a paddy axial flow -thresher

since threshing is one of the most sensitive rice post-harvest processing operations, this study was conducted to evaluate the threshing performance in axial - flow paddy thresher. independent variables consisted of: drum speed at five levels (550, 650, 750 and 850 rpm), equivalent to peripheral velocities of: 14.67, 17.35, 20.01 and 22.37 m/s, respectively, paddy moisture content at two levels...

Designing a Coreless High-Speed Axial-Flux PM Generator for Microturbines