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1. U A U R=120mm pa=760mmHg (1) A Pa (2) A mH2O 1 2 2. U R=130mm h=20cm 2m 980kg/m 3 3. 20 880kg/m 3 9m 500mm 600mm (1) kg(f) (2) Pa 4. U Hs=500mm 780kg/m 3 1000kg/m 3 U H 4 5 61 5. U A B h1 =1.20m h2 =0.3m h3 =1.30m h4 =0.25m N/m 2 A B p 6. 9m 10 h ( ) 6 7 7. 82kPa 100kPa Pa H 8. A B i (1) R H (2) A B 8 9 *9. 1 U 2 d/D pB p p hg hg d D Ba = () 21 1 2 2 62 *10. (1-9) p h pa 11. 114 4.5mm p=2MPa( ) 20 6300Nm 3 /h(N ,0 ,1atm) 12. 60m 3 /h 100mm 200mm A B 0.2m U 1630kg/m 3 (1) U mm (2) 12 13 13. 200mm U R=25mm 1.2kg/m 3 14. 0.5m 10mm C0=0.62 14 15 15. 3.77 10 -3 m 3 /s d=40mm D=80mm U R=170mm Hf J/N 16. 30 20mm 36mm 63 *17. (p1-p2) A1 A2 u1 u2 16 17 18. V=0.025m 3 /s d1 =80mm d2 =40mm p1 =0.8MPa( ) 18 19 19. ( ) 2 1 2 1 2 2 1 u A A h f = A1 A2 1,2 u1 Fn =p1 (A2 -A1 ) Ff *20. 0.04m uj=20m/s us =0.5m/s D=0.10m 1 P1 2 1 2 (1) 2 u2 (2) U R 64 20 21 21. 0.8m/s D=100mm d=99.96mm l=120mm 100mPa s *22. a b 3.5 10 -3 1 1mm a b 80s b c 1atm a b 22 24 *23. 7 1 max 1 / = R r u u (1)uu (2) / max *24. B H y (yBH) g BH y ) /( 3 3 2 m s m g B V = 25. 3m, 50mm ( =0.2mm) 65 8m 90 20m 3 /h kPa 20 26. 50mm 80m 90 5 40mm 20m 1/2 20 3 10 -3 m 3 /s z 25 26 27. ( ) 0.10m 3 /min 38 3mm 10m 20m ( ) 8 90 MPa( ) =1830kg/m 3 =12 mPa s 27 28 *28. 30 mPa s 900kg/m 3 A 40mm B 50m 20m ( ) 0.09MPa 0.045MPa 1/4 30m (1) (2) 29. 20 5m 32 3mm ( =0.05mm) 100m( ) *30. 2m /d=0.0004 200 66 0.67kg/m 3 0.026 mPa s 80000m 3 /h 1.15kg/m 3 20mmH20 *31. A=3m 2 2m 32 3mm 10m( ) =0.022 H 4m 30 31 32. 2.5 10 -3 m 3 /s 0.2MPa( ) 6m 1100kg/m 3 40 3mm ( ) 50m 0.024 32 33 *33. 6m A 600mm 3000m BC CD CE 2500m 250mm 0.04 A *34. C D AB 6m 41mm BC 15m 25mm BD 24m 25mm B (1)D C (2) D C 0.03 67 34 35 *35. A B C B C 20mm lB = 2m lO = 4m (1)B C ( =0.17) (2) H 1/4 ( =24) B C (3) =0.028 O *36. 5000kg/h 100 300mm 0.15MPa( ) 20 =0.016 0.85kg/m 3 37. 300mm 60 40 101.3kPa 0.02mPa s 30mmH2O 38. 5 cm 25mm U 220mmHg 1050kg/m 3 0.6 mPa s 39. 4004000l/h ( =2670kg/m 3 ) 20 l/h 40. 1m 0.5m/s 0.001m = 2500 04 du dy . 40 41. 6.28 10 -3 m 3 /s ( )l+le=20m 0.1m = 005 05 . . du dy =1250kg/m 3 J/kg 68 41 42 42. (Casson) =+ y du dy (a) du dy Pa s 40 du dy du/dy (1/s) 0.5 1.0 5.0 10.0 50 100 (Pa) 34 42.1 83.2 123 377 659 (a) y 43. =1200kg/m 3 d=10mm 1m H=0.35m w y d L dL L d g d p y = + 2 2 4 4 (a) p y 44. (1-63) r l 2 P = (a) n dy du K = (b) (a) (b) r=R u=0 + = + + 1 1 1 1 1 1 1 2 n n n R r R n n Kl u P (C) V (d) = R dr r u 0 ) 2 ( u 1 1 1 1 3 2 + + = n n R n n Kl u P (e) 69 44 1 . ? ? ? 2 . ? 3 . ? , , ? 4 . ? 5. 8 10 -3 m 2 10N (1) ( ) (2) 5 6 6. U R1 R2 A U R1 R2 ( ) 7 . ? 8 . ? ? 9 . ? 10. V D d R R .( ) 70 10 11 11. A B (1)pB pA 1 2 . ? 1 3 . ? 1 4 . ? ? 1 5 . ? ? 1 6 . ? u d e 2 /4 ? 1 7 . ? 18. (1) B ( ) A h1 h2 (h1 h2) (2) A ( ) B h1 h2 (h1 h2) 18 19 19. 1, 2 ,3 1 V V1, V2, V3 2 0 . , ; ? ? 71
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