Process Equipment and Plant Design
For annular flow of a fluid, the ratio of the equivalent diameter for pressure drop calculation to the equivalent diameter for heat transfer calculation is

(d1 + d2)/d2
D2/(d1 + d2)
D1/(d1 + d2)
(d1 + d2)/d1

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Overall gas transfer units to the number of ideal trays required
None of these
Ideal trays required to the number of real trays required
Real trays required to the number of ideal trays required

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