I need to find the torque that will rotate a stainless steel drum that is filled with small steel balls. The total volume of this drum is 210 cubic feet, and there will be 38 cubic feet of material inside at any given point in time. It is a horizontal cylinder that will rotate through its central axis. What is the torque required to start turning the drum.
Mass of Drum: 13,500 lb
Mass of Material inside: 13,700 lb
Diameter of Drum: 38"
Length of Drum: 297"
Drum to Rotate at 10 rpm
Friction in the bearings and the drive is negligible.
I know I have to consider that the material will move up the side of the drum as it rotates, but I'm not sure how to go about doing this.