General Conclusions and Suggestions
6.2 Suggestions for further works
Further works could focus on improving the usage of “Sandy” test bench. This experimental apparatus proved to be a robust test bench and could be further explored for validations of calibrated DEM models as well as to mimic the die filling process. It is suggested to rebuilt the die region using translucent material so PIV techniques could also be applied.
For the tests using the centrifuge it is suggested the usage of intermediate particle size (in the order of 100µm) with cohesive properties. This can give new insights of cohesion behaviour and would also be possible to simulate using CFD-DEM methodologies. This opens the possibility to explore the effect of surrounding air in different g-forces.
Tests with the centrifuge using vacuum in the lower cylinder region would also bring new insight on how cohesive powders behaves without the influence of surrounding air. One could expect in that case a mass flow much more similar to the Beverloo predictions.
Also the possibility of breaking force chains using centrifugal forces could be further explored for the die filling process. After filling with powder, the die could be centrifuged to improve the material density by breaking force chains formed in cohesive powders. This is specially interesting in geometric complex dies, in which the compression applied to the powder might not always be transmitted to all die regions.
In this sense the increase in gravitational force is a body force and should equally affect all particles in the system.
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