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7.11. Catalyst pellets 5 mm in diameter are to be fluidized with 45,000 kg/h of air at 1 atm and 80C in a vertical cylindrical

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7.11. Catalyst pellets 5 mm in diameter are to be fluidized with 45,000 kg/h of air at 1 atm and 80C in a vertical cylindrical vessel. The density of the catalyst particles is 960 kg/m?; their sphericity is 0.86. If the given quantity of air is just sufficient to fluidize the solids, what is the vessel diameter

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