Granular

Sieving

The rolling screen is used for sieving of granular material. The simulation was evaluating not mass rates and PSD for each individual section of the screen. Improvements of the screen design were validated using batch of simulations with several varying parameters.

This video is a HQ rendering of the screen being filled (via POV-Ray; set the video to 1440HD for better quality):

This is a detail on the gap:

This was an experimental small-size screen with vibrating cylinders:

This screen had several decks and complex transitions:

../_images/roro-complex-b.png ../_images/screen.png

This is a plot of PSDs in 3 different parts of the screen for batch with varying feed flow rates; it is collected as statistics of pellets passing through individual gaps:

../_images/rainbow.png

Jamming

This transfer point was having issues with jamming and abrasion; the simulation was able to suggest improvements in the geometry design:

This was a bin designed for partial segregation. Simulations were run to assess its efficiency and suggest improvements in the construction; this image shows layering evolution:

../_images/bin1a.png

Here, velocity vectors are shown so that active regions are visible:

../_images/bin2a.png

Abrasion

This simulation was analyzing abrasion of the plate when directing the flow from the conveyor. Changing the shape of the plate (by running batch of parametric simulations) helped reducing abrasion effects:

../_images/abrasion-smaller.png

Segregation

The chute on the image was exhibiting segregation of fractions, desipte them being well mixed on inlet conveyor; the simulation used the chute imported from STL and using a custom-developed flow analysis tool, we determined the places where the segregation was taking place, thus giving directions for improved chute design not exhibiting segregation.

../_images/flow-small-big-cross-vol.png

Tip

Report issues or inclarities to github.