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A Analytic, LLC Excellence in Engineering Analysis |
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Rathole Collapse Impact Force |
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A worst case collapse load would occur if the upper portion of a rat hole, in a full silo, collapsed. This analysis will consider that upper portion to be 6% of the total height. That is, the bulk solid will fall from a height of 94% of the full height of the silo. The resulting velocity obtained by the falling and fluidized Type 1, Portland Cement can be estimated by the law of conservation of energy (i.e. potential & kinetic). |
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Ninety four percent of the total height from the top of the Lone Star Silo to the base plate of the insert box is: |
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Thus, the approximate velocity is: |
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Conventional fluid mechanics theory can be applied on bulk solids in the fluidized state. To obtain an estimate of the load imparted to the beam insert, the momentum integral equation for internal control volumes can be employed. |
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Assumptions made in the current analysis: Steady Flow, Incompressible Flow, Uniform Flow over the cross section. Surface forces due to atmospheric pressure are negligible. Hence, |
