Dear Philbert

In order to understand the effects of ball mill diameter on the selection function, you need to have a look at Austin's scale-up model and interpret it accordingly.

Attached is my recent paper that provides a description of the scale-up model (see Equations 8 to 13).

I hope this helps

Francois

I recomand you to read this article

The Influence of Milling Conditions on the Ni3Fe Alloyed Powder

In the following article the variation of the fracture velocity with respect to the size of balls in the reduction of materials can be observed.

You may want to check also the following somewhat related discussions: https://www.researchgate.net/post/iv_to_reduce_size_of_tungsten_in_ball_millIs_it_possible https://www.researchgate.net/post/How_can_I_determine_the_best_RPM_for_Dry_Ball_Milling_machine_in_order_to_let_the_balls_to_fall_from_the_best_angles