1. .
tc = (37,6 +37,0)/ 2 = 37,30
2. , :
, | ||||
d = 0,014 , ; n = 28 . 2 | ||||
3. :
d = d = 0,0043 2 |
4. W (/).
W = L/f∙3600 = 0.025 /
5. . 1. = 0,0007 ∙ = 993 /3 .
1 -
-, 0C | m ×103, × | r, /3 | - , | l, /(×) | b ×105,1/ | |
1,790 | 4,210 | 0,552 | 13,700 | 0,500 | ||
1,310 | 4,190 | 0,575 | 9,520 | |||
1,010 | 4,190 | 0,600 | 7,020 | |||
0,810 | 4,180 | 0,618 | 5,420 | |||
0,660 | 4,180 | 0,634 | 4,310 | |||
0,560 | 4,180 | 0,648 | 3,540 | |||
0,470 | 4,180 | 0,659 | 2,980 | 51,100 | ||
0,410 | 4,190 | 0,668 | 2,550 |
6. .
= 496,239
7. :
) ( ):
t= 37,14680
) . 1 b (1/) :
b = 0,00038 (1/)
) :
= 3.154∙103
) 2 el;
2 el
Re | el l / d | ||||
50 | |||||
10000 | 1,28 | 1,13 | 1,07 | 1,03 | |
1,23 | 1,13 | 1,07 | 1,03 | ||
1,18 | 1,10 | 1,05 | 1,02 | ||
1,13 | 1,08 | 1,04 | 1,02 | ||
1,10 | 1,06 | 1,03 | 1,02 |
l /d .
el = 1
) . 1 : :
Pr = 4.5
Prc = 5,5
) :
Nu = 0,15 el×Re0,33×Pr0,43×Gr0,1(Pr/Pr)0,25= 5.419
8. (/(2×):
= 239,976 /(2×). |
l . 1 .
1. .
tc = (26,3 +31,6)/ 2 = 28,950
|
|
2. F (2), .
F =((d.)2 ∙π/4) - 28∙((d)2 ∙π/4) = 0,013 2
3. (3/):
= 173,464 3/ | ||||
, ; | ||||
V0 ( t), 3/. | ||||
4. w (/):
w = V0/F∙3600 = 3.639 /
5. (/3):
= 1,166 /3 | ||||
r0 - , r0 = 1,29 /3. | ||||
6. . 3 m .
3 -
, 0 | m ×106, × | l, /(×) | , /(3×) |
0,0244 | |||
19 | 0,0280 | ||
21,5 | 0,0326 | ||
0,0361 | |||
0,0396 |
m = 18∙10 -6 ∙
7. , :
= 6592
8. :
Nu = 0,018ε1 Re 0,8= 20,441
9. (/(2×):
= 18,646 | ||||
=0,028 | ||||
D , ; | ||||
; - , . | ||||
. 3. .