Question: A vertical tube whose lower end is sealed by a moveable plate is fi lled with a viscoplastic material having a yield stress of 20

A vertical tube whose lower end is sealed by a moveable plate is fi lled with a viscoplastic material having a yield stress of 20 Pa and density 1100 kg/m 3 . Estimate the minimum tube diameter for this material to fl ow under its own weight when the plate is removed. Does the depth of the material in the tube have any infl uence on the initiation of fl ow

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