Page 32 - Separation process engineering

t residence,dispersed

residence time of dispersed phase in settler, s
t
operating
operating time in batch distillation

t res

residence time in downcomer, Eq. (10-30), s, or on plate, Eq. (16-35e)
t tray

tray thickness, inches

T
temperature, °C, °F, K, or °R

liquid and vapor temperatures on stage j at the interface, K
T ref

reference temperature

u
vapor velocity, cm/s or ft/s

u flood

flooding velocity, Eq. (10-8)
u op

operating velocity, Eq. (10-11)

u perm

permissible vapor velocity, Eq. (2-64)
u
t,hindered
hindered settling velocity, Eq. (13-58)

u , u t,Stokes
t
Stokes’ law terminal velocity, Eq. (13-57), m/s

U
underflow liquid rate, (Chapter 14), kg/h

U a

superficial vapor velocity in active area of tray, m/s
v

superficial vapor velocity, ft/s
v characteristic

characteristic velocity of Karr column, Eq. (13-68), m/s

v c,flood , v d,flood

continuous and dispersed phase flooding velocities, m/s
v o