terms

Question 1

An

Answer 1

net area for vapour-liquid contact

Question 2

Aa

Answer 2

Active area or bubbling area

Question 3

Ah

Answer 3

Area of all holes on the plate

Question 4

Ap

Answer 4

The perforated area which includes blanked area

Question 5

Uf

Answer 5

Flooding velocity

Question 6

Flv

Answer 6

liquid-vapour factor

Question 7

Uv

Answer 7

vapour velocity

Question 8

Dc

Answer 8

column diameter

Question 9

Ht

Answer 9

Total plate pressure drop
Ht = Hd+Hw+How+Hr

Question 10

Hd

Answer 10

dry plate pressure drop, mm of liquid

Question 11

Ac

Answer 11

Total column cross sectional area

Question 12

Ad

Answer 12

Downcomer cross sectional area

Question 13

Hw

Answer 13

weir height

Question 14

How

Answer 14

weir liquid crest, mm

Question 15

Hr

Answer 15

residual head, mm of liquid

Question 16

Uh

Answer 16

vapour velocity through holes

Question 17

Co

Answer 17

orfice constant

Question 18

Hb

Answer 18

Estimate of downcomer backup
Hb=Hw+How+Ht+Hdc

Question 19

Hdc

Answer 19

head loss in the downcomer, mm

Question 20

Lmd

Answer 20

mass flow rate of the liquid through the downcomer, kg/s

Question 21

Adc

Answer 21

Ad or Aap (which is smaller)

Question 22

Hap

Answer 22

height of bottom edge of the apron above the plate, m

Question 23

Lw

Answer 23

weir length

Question 24

As

Answer 24

area of the unperforated strip edges

Question 25

Ls

Answer 25

Mean length of the unperforated edge strip

Question 26

Ws

Answer 26

width of the unperforated edge strip

Question 27

Ac

Answer 27

Area of one calming zone

Question 28

Wc

Answer 28

width of the calming