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How can I calculate angel of repose for particles with high surface energy?

Hello every body,
In order to lower E (young modulus) for my project, I want to calculate the angel of repose
In my case, the p-p surface energy is high (313 mJ/m2).
Because of the high p-p surface energy, all the particles stick together and do not leave the tube.(Please refer to the attachment.)
Do you have any suggestion for this problem?

Regards,
Fatemeh

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PrasadAvilala

Hi Fatemeh,

As you rightly mentioned higher surface energy increases cohesiveness.

how do you choose surface energy as 313 mj/m2.

In general, you should calibrate surface energy, if you're chosen surface energy from literature then you should follow all parameters such as bulk density, shear modulus, and interaction parameters from the same literature else you should calibrate surface energy.

Thanks,

Prasad A

Fatemeh Hosseini_22198

Hi Fatemeh,

As you rightly mentioned higher surface energy increases cohesiveness.

how do you choose surface energy as 313 mj/m2.

In general, you should calibrate surface energy, if you're chosen surface energy from literature then you should follow all parameters such as bulk density, shear modulus, and interaction parameters from the same literature else you should calibrate surface energy.

Thanks,

Prasad A

Thanks for your response Parsad,
Yes I got all the parameters from the literature.
The issue is that, the E is in the order of e+9 in the literature that make my simulations too slow.
I want to do bulk density and angel of repose test (based on the cohesion number) to reduce this E and make CPU time feasible.

Regards,
Fatemeh

PrasadAvilala

Thanks for your response Parsad,
Yes I got all the parameters from the literature.
The issue is that, the E is in the order of e+9 in the literature that make my simulations too slow.
I want to do bulk density and angel of repose test (based on the cohesion number) to reduce this E and make CPU time feasible.

Regards,
Fatemeh

with a reduced E value, you should re-calibrate for the literature angle of repose and bulk density.

to reduce the number of simulation iterations what I could do is first with literature values will carry out bulk density and angle of repose and check whether the values from the simulation matches with literature or not . Based on this as a next step reduce E value, and find out the surface energy, solid density, and interaction parameters at which bulk density and angle of repose will match with the literature value.

Thanks,

Prasad A