Environmental Engineering Reference
In-Depth Information
Ta b l e A . 5
Continued.
Number Formula
C
Units
10
20
in Å
2
,
7
D
CE
/(
TN
σ
)
1.160
E
in V/cm,
T
in K,
σ
N
in cm
3
10
16
in Å
2
,
1
E
in V/cm,
T
in eV,
σ
N
in cm
3
C
p
T
/
m
/(
Nr
2
W
) 1.469
10
21
cm
2
/s
r
W
in Å,
N
in cm
3
,
T
in K,
m
in amu
8
D
0
D
0.508 cm
2
/s
10
19
cm
3
,
r
W
in Å,
N
D
2.687
T
in K,
m
in amu
54.69 cm
2
/s
10
19
cm
3
,
r
W
in Å,
N
D
2.687
T
in eV,
m
in amu
C
(
p
TmNr
2
W
)
1
10
19
cm
2
/(V s)
r
W
in Å,
N
in cm
3
,
T
in K,
m
in amu
9
K
0
D
1.364
0.508 cm
2
/(V s)
10
19
cm
3
,
r
W
in Å,
N
D
2.687
T
in K,
m
in amu
54.69 cm
2
/(V s)
10
19
cm
3
,
r
W
in Å,
N
D
2.687
T
in K,
m
in amu
10
5
cm
2
/s
in 10
5
g/(cms)
10
D
0
D
CT
/(
r
W
η
)
7.32
r
W
in Å,
T
in K,
η
0.085 cm
2
/(V s)
in 10
5
g/(cms)
11
K
0
D
C
/(
r
W
η
)
r
W
in Å,
η
7 The ion drift parameter in a gas in a constant electric field
), where
E
is the electric
field strength,
T
is the gas temperature,
N
is the number density of atoms or molecules, and
D
eE
/(
TN
σ
σ
is
the cross section of collision.
8 The reduced diffusion coefficient f
or a sph
erical cluster of small size in the first Chapman-Enskog
approximation (4.114),
D
0
3
p
2
T
/
m
/(16
Nr
2
W
), where
T
is the gas temperature,
N
is the
number density of gas atoms,
m
is the mass of a cluster atom, and
r
W
is the Wigner-Seitz radius.
9 The zero-field reduced mobility for a sphe
rical cl
uster of small size in the first Chapman-Enskog
approximation (4.113),
K
0
D
π
3
e
/(8
Nr
2
W
p
2
mT
), where the notation is given above.
10 The reduced diffusion coefficient for a spherical cluster of large size (4.110) in a gas,
D
0
D
π
is the gas viscosity; other notation is as above.
11 The zero-field reduced mobility for a spherical cluster of large size (4.110),
K
0
D
T
/(6
π
r
W
η
), where
η
D
e
/(6
π
r
W
η
),
where the notation is given above.
