bundan:
Pvk = const
bu ifoda adiabatik jarayonning tenglamasi deyiladi.
Endi param etrlar orasidagi b o g ‘lanishni topamiz:
Bosim va hajm orasidagi bo g ‘lanish:
P ;vik = P:v2k
A
д
H arorat va hajm orasidagi bo g ‘lanish:
f
\
v,
A'-I
1
4 2 /
H arorat va bosim orasidagi bog ian ish :
ъ,
г,
k-\
f
P2
X T
X
Ichki energiyaning o ‘zgarishi:
Ди + / = 0,
Au
=
cv
(T2 — T,)
Jarayonning ishi:
к
- 1
k - \
/ = с
(T — T 7)
chunki
I = — A
и
T
(70)
(71)
J
a)
b)
9-rasm. a) adiabatik jarayonning P- V diagrammasi;
b) adiabatik jarayonning T -C diagrammasi.
32
www.ziyouz.com kutubxonasi
J aray o n n in g
issiqligi
q = 0
E ntropiyaning o ‘zgarishi
As=0
Jarayon tahlili shuni k o ‘rsatadiki, bu jara yonda
ish ichki energiyaning
o ‘zgarishi hisobiga amalga oshiriladi.
1 6 -§ . P olitrop ik jara yon
Jaray o n n in g tenglamasi.
PVn =
const
n = ± oo o ‘zgaradi.
T e n g l a m a n i k e ltirib c h i q a r i s h u c h u n t e r m o d i n a n i i k a b i r i n c h i
q o n u n in in g ichki energiya va entalpiya y orda m ida
yozilishi ifodasini
k o ‘ramiz:
d q = c d T = c vd T + P d v
(72)
d q = c nd T = c pd T -vdP
(73)
(73)ni (72)ga b o ‘larmz:
(c n - c p ) d T _
v d P
(<
cn - c v) d T
P d v
’
n — k
n -
1
c„ -
cv
v
d P
C n= C v ------
- —
politropik issiqlik sig‘imi
c „ - c p
P d v
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