Question: Intermittent flow is experienced from a cylindrical silo with a conical hopper that is several years old. The design criteria have been checked by

Intermittent flow is experienced from a cylindrical silo with a conical hopper that is several years old. The

Intermittent flow is experienced from a cylindrical silo with a conical hopper that is several years old. The design criteria have been checked by re-measuring the powder properties and wall friction. The powder properties were found to be unchanged but it was discovered that the hopper wall had become badly scored. Using the following data and figures determine what minimum diameter opening is now required. Powder characteristics: Bulk density: 1800 kg/m, angle of internal friction is 50 Unconfined yield stress (kPa) 8.5 Maximum consolidation stress (kPa) Wall friction results. Year 1 Year 5 Normal stress (kPa) Shear stress (kPa) Normal stress (kPa) Shear stress (kPa) Hopper half angle is 15 16.0 8.00 1.41 8.00 3.23 5.8 10.0 4.00 0.71 4.00 1.62 3.0 3.5 2.00 0.35 2.00 0.81

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