Sf

Derating factor, defined in Sec. 6.2.10.

t

Tray deck thickness, in.

ta

Residence time of vapor in froth, s.

'L

Residence timp of liquid in froth, s.

tR

Downcomer apparent residence time, s.

u

Velocity, ft/s (in Fig. 6.11, u is ┬źN,nood).

ua

Same as uB.

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