反应堆热工水力学课后习题讲解（清华大学出版社）

b). 热交换器内压降

Re 2 = Re1 = 3.018 × 10

.8

200.4

5

Pr = 0.858

k = 567.7 × 10 W 0

mC

?3Cp=5.448×10J0

C kg3

Nu ? k 5235 567.7 × 10 . ×W 0

h = = = 11888?3 mC 25 × 10 d

?3

hFΔt 11888 × π × 25 × 10. × 0

Δt 2 = = = 19.4 C

WC p 15 × 40 ×0.5294 5.448 ×

3 10

0Δt 2 t = t1 ? = 290.3 C

2

Nu = 0.023 Re Pr = 5235.

?3

3 ?6kg 1m ==747.3∴ v2 = 0.001333μ2 = 93.36 × 10 Pa ? s ρ 2 v2 kg m m=144381

3 s =

d 22 × ( 25 × 1)

Wv2 0.5294 ×0.0013381

V2 = 0.

π π ?3 2

4 4

.

热交换器 试验段

Re 2 =

d 2V2 ρ 2

μ 2

25 × 10 × 1443 × 7=

47.33

?3

93.36 × 10

?6

= 2.888 × 10

5

13:14:49 习题讲解 36

1 3? ? ? 0.0015 6 ? 10 ?f2 = 0.0055 ?1 + ? 20000 ×+ 5 ? = 0.0146

? ? 25 3.018 ×10? ?? ?

? μ w

f = f 2 ? ? = 0.0160

?

? μf ?

0.6

ΔPf2 = f2 L2 ρ2V= 752Pa

d2 2 a

ΔPel2 = 0

ΔP 2 = G ( v3 ? v1 ) = ?1751Pa

2

2 2

13:14:49 习题讲解 37