Di usion de particules Notes de cours - Alain Le Rille

•
•
•
•p−n
N0V
Σ
N0=ZZZ
V
n0.d3τ
n0m−3)
dN0S dt
dN0=φN.dt φN=ZZ
S
~
jN.d2~ S
φNs−1
◦

~
jN
~
jN
m−2.s−1
~
jN=n.~v
~v
Σ
dN0
dt =−ZZ
Σ
~
jN.d2~ Σ
◦

~
jN=−D.−−→ grad (n0)
D m2.s−1
x
~
jN=−D.∂n
∂x .~ux
~
jN
n0)
D m2.s−1n
20◦C P =
1atm
◦

D m2.s−1
Xe 44.10−7
Kr 90.10−7
N2200.10−7
20◦C P = 1atm
25◦C
D m2.s−1
NaCl 19.10−10
5,2.10−10
25◦C
D=kB.T
6.π.a.η
a η
T
D=1
3hli.hvi
hli
D=2.R 3
2
3.√πσ
T3
2
P.√M
D P −1
D T α1,66α62α= 1,5
0◦C
P= 1atm D M−1
2
◦

D m2.s−1
H2611.10−7
CH4196.10−7
O2178.10−7
CO2138.10−7
0◦C P = 1atm
4%
0,7%
UF6
cm2
235U
238U
4%
M(F) = 19g.mol−1
BUF6
x D
n0(x, t)
∂n0
∂t =D∂2n0 ∂x2
◦