, . , , Q G2 cp2 (T2 T2), ,
T1 T1 Q(G1cp1), , cp1 cp2 .
: 4190.
W1 W2
W 4G (ρ πd2) W 4G
2ρ2π(D2 d2) 2,2
ρ1 ρ2 , /3
, . ( ). Re2 d D d2.
Nu1 Nu2, .
T2 T1.
1 , /
α1 α2.
kl
kl
kl, /( ):
α1 , /(2 ); α2 , /(2 ); λ , /( )
2.9.
l Qql, .
F πd1l, 2.
Pr1 = 2,21 [2,537];
Re1 = 177420,8 = lg 177420,8 = 0,8 lg 17742 = 0,8*4,2490= 3,3992;
Pr1 = 2, 20,4 = lg 2, 20,4 = 0,4 lg 2,2 = 0,4 (lg 22 - lg 10-1) = 0,4 (1,3424 - 1) = 0,4·0,3424 = 0,1472;
Antlg = 0,1472 = 1,404;
Nu1 = 0,023*60120,8×2,210,4 = 129,0;
a1 = Nu1l1/d =/ (2∙); (11)
=5440 / (2×K).
l1=0,673 / (×K) - 80 [1, 810]
= 1/ (1/5440+ 5,73*10-4 + 1/1296) = 109 / (2×).
t2 = t2+ t/a2= ; (14)
|
|
t2 =55+ 109* (-25) /1296 = 52,9 ;
Pr2= 9,6 a1 = / (2*); (15)
Pr2=1296× (11,1/9,6) 0,25 =1345 / (2×).
t1 = t1 - KDt/a1 = ; (16)
t1 = 30 109*(-25) /5440 = 30,5 ;
a1 = 5440 (2,21/2,43) 0,25 = 5338 / (2×).
K = 1/ (1/1345 + 5,73*10-4+1/5338) = 124,66 / (2×);
t1 = t1 - KDt/a1 = ; (17)
t1 =80,0 - 124,66*35/5338 = 79,2 .
t2 = t2 - K Dt/a2 = ; (18)
t2 =55+ 124,66* (-25) /1345 = 52,68 .
.
F = Q/ (KDt) =84,8×103/ (124,66×35) =19,442
. , .
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1. .. . .: , 2007 842.
2. .. . " ", .: , 2010 223.
3. .. . , .:2007 496.
4. .. .. " " . 2004 229.
5. .. .. : .: 2005 7.
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7. . , .. .. .:, 2007576 .
8. .. .: , 2010 95.
10. .. . ., 2009 288.
11. .. . , 2008350.
12. .. .. . , 2003 590 .