Environmental Engineering Reference
In-Depth Information
Table 6.3 Definition for the number of transfer units and the height of a transfer unit
[5]. Reprinted by permission of John Wiley and Sons, Inc. Copyright c
1980.
Number of transfer units
Height of a transfer unit
Driving
Mechanism
force
(NTU)
(HTU)
y A in
Equimolar
d y A
y A I
V
k y aA c
counter
y A I y A
N G
H G
diffusion
y A
y A out
y A in
d y A
y A
V
K y aA c
y A y A
N OG
H OG
y A
y A out
x A out
d x A
x A x A I
L
k x aA c
x A
x A I
N L
H L
x A in
x A out
d x A
x A
L
K x aA c
x A x A
N OL
H OL
x A
x A in
Diffusion
y A out
(1 y A ) m d y A
V
k y aA c (1
through a
y A I
y A
N G
H G
stationary
(1
y A )( y A I
y A )
y ) m
component
y A in
y A out
(1
y A ) m d y A
V
K y aA c (1
y A y A
N OG
H OG
y A )( y A y A )
(1
y ) m
y A in
x A out
(1 x A ) m d x A
L
k x aA c (1
x A
x A I
N L
H L
(1
x A )( x A
x A I )
x ) m
x A in
x 2
x A ) m d x
(1 x A )( x x A )
(1
L
K x aA c (1 x ) m
x A
x A
N OL
H OL
x 1
a = specific surface of column packing
A c =
empty tower cross-sectional area
Search WWH ::




Custom Search