t.=(t'+t'')/2; (1.2)
t. =(20+60)/2=40 .
l l, r r, 
v v, n n, .
t. =82,5, l = 0,674 /( ), r = 971,8 /3, n = 0,365 2/, = 4,195 /( ).
t. =40, l =0,634 /( ),, r = 992,2 /3, n =0,659 2/, =4,174 /( )..
Q= D (t'-t )ηn=D(t -t') (1.3)
Q,
Q= D(t -t') (1.4)
Q =6,2∙4,187∙(95-70)=649
D, ηn, 0,95-0,99
; (1.5)
Dk =649/[4.187∙(95-70)∙0.98]=9,6 /
w =0,5/
Re= 
(1.6)
Re= 
d=d-2d - , , 
- , 2/.
( ) :
| n = 4D / (w × r ×p × d2 )=4∙6,2/[1∙992,2∙3,14∙0,014²]=40 (1.7) |
r t, /3.
n =1588 D'/S =44.
D'= (D'/S) S. (1.8)
D' =6∙19,2=144 .
D=D'+d+2k; (1.9)
D =144+16+32=192 .
k - , 6 .
D=200.
:
| (1.10) |
| (1.11) |
| (1.12) |
( )
(1.13)
Nu =0,023∙212440,8∙4,310,4∙1=119,5,
- 1 [1] ; 
- , 
, =1.
. (1.14)
α =119,5∙0,634/0,014=5412/²∙
.
, .
D =0,2
F1= 
(1.15)
|
|
|
F1 =3,14∙0,2²/4=0,0314 ².
:
(1.16)
f= 3,14∙0,0162∙37/4=0,0074355 2.
:
(1.17)
f1= 0,0314 - 0,0074355= 0,024 2.
:
(1.18)
Re = 
(1.19)
Re = 
d - , ,
(1.20)
=3,14∙(0,2+37∙0,014)=2,25. (1.21)
,
(1.22)
- 1 [1] ; - , , =1;
(1.23)
= 
(1.24)
= 
δ - ,, 
λ - /(),
- .
(1.25)
- ( )
, (1.26)
 |
Δt - , Δt - .
(1.27)
d=(d+d)/2 =(0,014+0,016)/2=0,015. (1.28)
=3/ 
=3/
(1.29)
:
(1.30)
d1= 50; d2 =65.
 |
.
.
D, , ,
(2.1)
SD , ; SD , ; SD , , ; SD , .
,
(2.2) 
l ; L , ; d , , ; r , /3; w , /.
:
(2.3)
, , :
:
(2.4)
:
m, , , :
  (2.5)
|
m =45,
|
|
|
ζ =(5,4+3,4m)Re-0,29 =1,3 (2.6)
, , , :
(2.7)
w1 w2 , /; 
r1 r2 , /3.
(D =0), .
, :
: 
: 
, :
: 
(2.8)
: 
GB , 3/; h = 0,85 .
 |
