film fouling
wall fouling
film Th
Tc fh dh
w
dc fc
Tc
Q Rfh Rdh Rw Rdc Rdh
Th
Tfh Tdh Tdc Tdh
film fouling
wall fouling
film Th
Tc fh dh
w
dc fc
Ao
Ai
Tc(0) Th(0)
Th(L) Tc(L)
Countercurrent
Th(0)
Tc(0)
Th(L) Tc(L)
Cocurrent
U
W
D
dA1
dA2
I
I
1-H ----HA
Eb J
Q
1-H ----HA
Eb J
Q
----1 A1F12
J1 J2
1-H ----HA2 1-H
----HA1
Eb1 Eb2
Q12
T1, A1
T2, A2
----1 A1F12
J1 J2
1-H
----HA2 1-H
----HA1
Eb1 Eb2
Eb3 1-H
----HA3 ----1 A2F23 ----1
A1F13
J3
----1 A1F12
J1 J2
1-H
----HA2 1-H
----HA1
Eb1 Eb2
----1 A2F23 ----1
A1F13
J3
1 m 2
Q/A
---1 A1F12(1-Hm)
J
1J
21-H
----HA2 1-H
----HA1
E
b1E
b2---1 A2F2mHm ---1
A1F1mHm
E
bm(m,n) (m+1,n) (m-1,n)
(m,n+1)
(m,n-1)
(Nx,Ny)
(Nx,n) (Nx-1,Ny)
(Nx,Ny-1) (Nx-1,Ny-1)
(Nx,n+1)
(Nx,n-1) (Nx-1,n)