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Chemical Engineering Mass Transfer Difficulty: Medium

The dimension of diffusivity is same as that of the

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During conversion of ammonium carbamate into urea, presence of large excess of water In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres; ρ = apparent solid density, kg/m 3 ; L = flow rate of dry solids, kg/see.m 2 drier cross-section; H = hold up of solid.) Flow measurement in an open channel is done by a/an Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH) 2 . Lead pipes are readily corroded by Rate of heat release in a furnace, which is the measure of heat intensity is defined as