, . F F . , u . , u2.
, , , : .
, S d u /dx, , x:
. | (4.1) |
h , .
, | (4.2) |
r .
R, . , u (. 4.1).
, ( . 4.1 ).
. , ( ) L = 2 R/ 3 . ,
, | (4.3) |
D ; u .
, Re << 1, ,
. | (4.4) |
S = 4p R 2, , (. (4.1)) Re < 0,1
F c = 6ph R u. | (4.5) |
, , , (. 4.2)
(4.6) |
. | (4.7) |
(4.6) (4.7) g , r1 , r2 . , F c = 0 . , , :
, | (4.8) |
u = u.
(4.8) (4.5), (4.6), (4.7), :
|
|
. | (4.9) |
, , , ,
, . , l, . , , . .
1. . 4.1.
4.1 | |||||
/ | D, | l, | t, | u, / | h, |
2. , , : 5, 20, 40, 60 . .
3. , .
4. , , , . , . . 4.1 . . 4.1.
. , 2- 3- .
5. . .
6. , .