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

Fatemeh Hosseini_22198

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

Prasad Avilala_20558

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

Prasad Avilala_20558 said:

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 

 

Prasad Avilala_20558

Fatemeh Hosseini_22198 said:

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