[1]
Nu = 0,025 R0,6 Pr0,38 (Pr/ Pr)0,25. (1)
t= 30 0 [1]:
ρ = 1,127 /3, = 1 000 /(), λ = 2,6510-2 /(),
μ = 18,6810-6 , ν = 16,5810-6 2/, r = 0,71.
: Re = 3260, Nu = 2,82 α = 4,15 /(2∙). α.
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| .2. | . 3. : 1 , 2 - , 3 . |
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1. - . : /.., .., .. . : , 1982. 512.
2. : /.., .., .. . : , 1991. 736.
3. .. . : , 1976. - 216.
4. 38651 RU. / .. . . 10.07.04. . 19.
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The calculation of heat transfer tube modernized, made of steel. The calculation of heat transfer tube modernized, made of copper alloy heat-resistant.
, (. 1)
[1], (. 2), 2,7 . δ = 1210-3 l= 36 /(×).
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q = α· (t t/1), (1)
q = 
· (t/1 t1), (2)
q = α· (t1 ts), (3)
α· (t1 ts)= α· (ts t2), (4)
q = α· (ts t2), (5)
q = · (t2 t/2), (6)
q = α· (t/2 t). (7)
(1) , α = 10 /(2) q= 1,2 /2 t/1= 600 0.
(2) t1 = 200 0
(3) ∆t = 200 ts= 40 ºC. ts= t=160 ºC.
t2 (5). t2=120 ºC.
t2/ (6). t2/=110 ºC. α (7). α = 10-20 /(2).
l = 0,15 F = 8,48 . 10-3 2. E = 3 F= 25,43. 10-3 2.
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Q = α. F. (t2/ - t). (8)
α = 15. 103/(2.) t2/ , t2/> 110 0.
(8) Q = 41 61 .
