In a rotary drier, the average retention time of solid is (where Z = length of the drier, metres ρ = apparent solid density, kg/m3 L = flow rate of dry solids, kg/see. m2 drier crosssection H = hold up of solid.) ?
(A) Z.H.ρ/L
(B) L/Z.H.ρ
(C) H.ρ/L
(D) Z.H/ρL
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