Page 27 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

22

ac
G x = -D.—dy.dz.dt . (58)
dx

Trough wall check it is

8C
G v = -D.—dx.dz.dT , (59)
By

respectively trough wall dxdy it is

BC
D.—dy.dz.dT. (60)
&

The quantities of the component diffused through the opposite walls are as
follows:

=G X+ dG x = -D—.dy.dz.dx - D—i^Adx.dy.dz.dt (61)
8x dx \ dx )

=G y + dG y = -D^-.dx.dz.dr - D^-(~)
dy dy{dy)

G g+lb =G Z+ dG z = -D^.dx.dy.dT - Df-\ %. Wdx.dy.dt
dz 8z\8z J

The increasing of the mass quantity diffused in the volume of the
imaginary parallelepiped on each coordinate axis is;

dG x =G X- G x+dx = D^-dx.dy.dz.dr (62)
ox

dG y =G y- G y+ety = D-jdx.dy.dz.dz (63)
dy