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T,v - F=u-Ts, /- . - dF=-sdT-pdv. F=f(T,v), dF=(δF/δT)νdT+(δF/δν)Tdv, (δF/δT)ν==-s; (δF/δν)T=-p. -, - T ν. . /- G=h-Ts=u+pv-Ts, /- . dG=-sdT+vdp. /- (δG/δT)p=-s; (δG/δp)T=ν; - T p.

 

23. - - . , - , - . C , ( ) , . . - , - . - , , - -.

- , - - , .. \ . - -: - - -, - .

25.

dE=(ul + p1 v1 + wl2/2 + gy1) dm1- (u2 + p2 v2 + w22/2 + gy2) dm2 + dQ - dLT - dL, (2.34)

v1 = dV1/dm1, v2=dV2/dm2 .

. (2.34) , ,

. , . , (2.35)

m1, m2- , /; - , /; - , , /.

- , :dE=0; dm1=dm2=dm; dV=0.

(2.34) dm v1 = dV1/dm v2= dV2/dm q= dQ/dm l= dLT/dm, 1 , [1]. (2.34) (u2+p2v2) - (u1 +p1v1) = q - l - (w22 /2-w12/2) -g(y2-y1).2.36

(2.35), (2.36) . \ , , . , , h: h=u+pv. - 1 - - Dh = q -l - D(w2/2) -D(gy). : Dh=h2-h1- ; D (w2/2) = w22/2-w12- ; D(gy) =gy2-gy1 .

 





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