Chapter 26 Steady-State Molecular Diffusion

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Chapter 26Steady-State Molecular Diffusion

• Fig. 26.1 Arnold diffusion cell
• B??A????????
• B?A???????(????)

 
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3

•  

4

•  

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Arnold diffusion cell??????????(p. 458)

•  

??? ?????
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?????(p.462)

•  

 
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???????????(p.463)

• Homogeneous reaction
• ??????????????????

Eq.(25-11)??RA?????????
2. Heterogeneous reaction ??or???????????????
Eq.(25-11)??RA???? (?????????????????)
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???? (diffusion controlled)
????gtgt???? (????)
???? (reaction controlled)
????ltlt????
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Homogeneous Reaction
1????(Fig.26.8?????)
????
?Eq.(26-44)
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?????????????????????????
?Eq.(26-60)
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?Eq.(27-9)
?????(???)
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26?????
??????? Heterogeneous Homogeneous
?????????? ????? ???? ????????????????
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?????????(p.483)
??????????? ?????A?????
????p.96
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????????2??
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ox?????ltltox?????
y??????
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(2), (3)?(1)
vx(x????)y???????
????(B.C.)??
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?????????
x????1?
x0 CA0
y????2?
yd CA CA 0
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????
?????????
Navier-Stokes equation v???m2/s
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?Cp???
(19-14, p. 280)
??????(??????) a????m2/s
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(25-18, p. 437)
????? DAB????m2/s
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??a?DAB L2/t ex) m2/sec
???????????
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?/aPr(??????)
??????????????????
?/DABSc(??????)
???????????? ??????????
a /DABLe(????)
??????????????????
Pr?Sc?Le?????
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Flux?????
Flux????-1
Fourier???
??????????????????
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????????????????????
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Flux?????
Flux????-2
Newtons law of cooling p.208, Eq.(15-11)
??????????????????
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Heat Flux????p.270
???Nu(??????)
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Mass Flux????p.520
???Sh(???????)
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??????????? ?????????
kC??????
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28.1 ??
(a)   293K, 1.013105Pa?????????CO2?
???????????
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(b)293K????????CO2????????????
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28.18 ??
?????????????????????
?????????????????????
(a)???????100 000?????????????? ???????
????????????????
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?????????????100 000???????L
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(c)???????1000 000?????????????? ???????