Process Equipment and Plant Design
Diameter of the seive tray column is determined by the

Lower limit of vapour velocity
Height of the plate spacing
Upper limit of the vapour velocity
Hole diameter of the seive tray

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Process Equipment and Plant Design
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

Less than that for fluid flow
More than that for fluid flow
Same as that for fluid flow
D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively)

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