Calculate the minimum velocity at which spherical particles of density 1600 kg/m' and of diameter 1.5 mm will be fluidised by water in a tube of diameter 10 mm on the assumption that the Carman-Kozeny equation is applicable. Discuss the uncertainties in this calcula- tion. Repeat the calculation using the Ergun equation and explain the differences in the results obtained.

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Q: of

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