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中 级 物 理 化 学. 主讲:谢修银. 长江大学化学与环境工程学院. 非平衡态热力学. 平衡态热力学 一 、热力学第一定律 dE = Q - W(1) 式中: E :体系的内能; Q :热量; W :功。 对于孤立体系,有: dE=0(E 为恒量 ) 对于一般体系,因为体系与环境间存在能量的交换,故内能 E 的值是不断变动的,体系内能的变化可以分为两项: d i E :体系内部过程所引起的内能变化; d e E :与环境的交换引起的内能变化。 而 d i E 相当于孤立体系的内能的变化,由热力学第一定律,孤立体系的内能是恒定的: - PowerPoint PPT Presentation
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dE = Q W(1)EQWdE=0(E)E diE deEdiE diE 0(2)
diE=0 deE=dE=QW (3)
dS=diSdeS(4) diS: deS:diS diS 0(5)deS
diS=(diS)j (6)
(diS)j 0 (diS)1 0 (diS)2 0 [di(S1+S2)] 0(diS)
diS(1), diS(2)
diS(1) 0 diS(2) 0 [diS(1)diS(2)] 0
: (T,V,N)(T,p,V) : :
Tp (T,p)tdtt
t t+dt t+dt ttt+dt
, , .
t r :(n,E)
QV. Q tr = (t, r)(1)Q Q(t)=V (t,r) dV(2)QQjQ(t,r)
: Gaussdiv
(3)(4)dQ/dt(5)(5)
l n1,n2,nl i
1. :
mkA,A B,B C,C D,Dk(mol/t,V)i
():
TdS=dEpdVidni :s:e:v:dv=0.
de/dtdni/dtds/dt
(16)
Fi i:
t
(21)(18)442
1. JkXk
, ., ()Taylor, ,:
XJLX28
q=T
JkXiJk=Jk Xll=0,1,2,
TaylorX Lk,kXkJkLk,l
B0C0k1B0=k2C0 C0=B0(k1/k2) ArG
v=k1Bk2C
J1J2J1L11X1L12X2 J2L21X1L22X2 L12L21
= J1X1+J2X2 = (L11X1L12X2)X1+(L21X1L22X2)X2 =L11X12+(L12+L21)X1X2+L22X22 0 L11>0; L22>0; (L12+L21)2 < 4L11L22 =kJkXx= k,kLk,kXkXk 0(3)
f=ax2+bxy+cy2 f=XAXfA
L11>0;
(L12+L21)2 < 4L11L22 (L12+L21)2 > 0 L11L22> 0 L11 > 0L22 > 0 L11 > 0L22 > 0 (L12+L21)2 < 4L11L22
2. ( Curie):
PrigogineCurie
A/T
CuriePrigogine
3.Onsager Lkk=Lkk (4) kJkkXkkJkkXkS
v1=k1A-k-1BA1=A-B v2=k2B-k-2CA2=B-C v3=k3C-k-3AA3=C-A =vk(Ak/T)=1/TvkAk =1/T[v1A1+v2A2+v3A3] =1/T[v1A1+v2A2+v3 (-A1-A2)]A3=(A1+A2) =1/T[(v1-v3)A1+(v2-v3) A2]
A1/T, A2/TX1X2J1=v1-v3X1=A1/T J2=v2-v3X2=A2/T
A,0= B,0= C,0 A1,0= A2,0= A3,0=0v1,0= v2,0= v3,0 k1A0=k-1B0 k2B0=k-2C0 k3C0=k-3A0
v1= k1A-k-1B=k1(A0+x)-k-1(B0+y) = k1A0- k-1B0+ k1x- k-1y = k1xk-1y(k1A0=k-1B0)
v1= k1xk-1yv2= k2yk-2zv3= k3zk-3x A1= AB = AB +A,0+B,0A,0B,0 = A,0B,0+ AB = AB A,0= B,0 A,0:A B,0:BC,0:CA= AA,0 B= BB,0
i,0=i0+RTln(pi,0/p0)i =i0+RTln(pi/p0)=i0+RTln[(pi/p0)(pi,0/pi,0)] =i0+RTln[(pi/ pi,0)(pi,0/ p0)] =i0+RTln(pi,0/ p0)+RTln(pi/ pi,0) = i,0+RTln(pi/ pi,0)AA= A,0+RTln(A/A0) = A,0+RTln[(A0+x)/A0] = A,0+RTln[1+(x/A0)]A= AA,0= RTln[1+(x/A0)]
=J1X1+J2X2
L11=1/R(k1A0+k3C0)L12=k3C0/R L21=k3C0/RL22=1/R(k2B0+k3C0)L12=L21 Lkk=Lkk
:,,.,,.,.,,.,,,.,.,...
: . T1,T2. ,., , ,..
Onsager1931;Prigogine1945 :,.,,: XX, : JJ., X, J, XJ., . ,XJ, J., : .
:, : =JX+JX J=L11X+L12X J=L21X+L22X ,L12=L21: = L11X2+2L21XX + L22X2 ,X, X. X, X: /X= 2L21X+ 2L22X = 2(L21X+ L22X) = 2J : J=0:(/X)J()= 0
.:, L22>0, . , . ,, . :
l,k, , , :k = 1,2,3,P,
: , .:1, 1.2, 1.3, 1.
, , , ., , . : .
., , , ., .: , , . , , .
.Onsager, .
, , , .
, .
()
(Benard)T1T2
B-Z (Belorsov)1958ZhabotinskyBZ