, .
, , , . , ; .
v . 7.2.
r r l (. 7.3, ). 1 2 ,
, [. (7.1)]
S = 2πrl . , , , : F = F. (7.2) (7.3),
- , dv/dr < 0 ( ). (7.4)
:
'
, (v = 0 r = R),
. (7.5) (. . 7.2):
, (r = 0):
, Q , 1 . dr. (. 7.3, ) dS = 2πrdr. , , . 1
(7.6) (7.7),
Q, R 1 , (7.8), η , 1- 2 , l.
(7.8), (1 2) , .
(7.8) . , , 1 , :
|
|
, η, l .
. , , , (. 7.4, ) (. 7.4, ), :
, , (1 - 2)/1 dp/dl,
, , (. 7.5, ). , 1: dp/dl = const. Q ( ), [. (7.12)] . . 7.5, .