1-1 1-1 1-5 0.05 1-6 1 60mm 1.5W/(m K) 5-5 m C 1-7 1cm, 0 m 1.04W/(m K) C C 50 50 4.09 10 kj/kg C 1-9 =69 C f =0 w C =14mm d 80mm 8.5W 1-11 10mm 0 C
85 C ( ) 175 W m K 1mm 1-14 T0 0K T = w 50K ε = 0. 7 q =? 1-16 r = 0.5m ε = 0. 8 Φ= 175W T w =? 1-17 =.5mm ( h1 = 95 W m K) h 5800 W ( m K) = δ 46.5 W ( m K) λ = k 1-18 λ = 0.116 W m K 1mm mm ( ) λ = 1.15 W ( m K) k =? 1-7 1 0.1m δ = λ = 17.5 W (m K) 1 = 7 w C w = 17 C = w =? 1-8 f 1 0 C λ = K 0.78W ( m ) Φ =? 60cm 0cm δ = 4mm f = 0 C h1 10 ( = W m K) 50 W ( m K) h =
- δ = 0.794mm λ = 45W/(m K) δ = 15mm λ = 0.07W/(m K) δ = 9.5mm λ = 0.1W/(m K) A = 7.m f 1 = C f = 0 C h 1 = 1.5W/(m K) h =.5W/(m K) Φ= -8 d 1 = 180 C = 0 C 1 10 d=50mm = w 1 400 C δ = 40mm λ = 0.11W/(m K) 45mm δ = λ = 0.1W/(m K) = C w 50 1d=100mm =75mmλ = 0.06W/(m K) λ = 0.1W/(m K) A B A B -17r=00mm 4 0mm λ = 1.8 10 W/(m K) i=-195.6 =5 199.6kJ/kg -18 i=-40 d=m 1mm 0mm λ = 0.1W/(m K) w = 40 C h =0W/(m K) -18
10 7 5mm 40 C 85 C Φ = 1.8kW 0. m 1 λ =? λ = λ (1 + b) λ 0 b λ0 b 1 q =1000 W m x=0mm10mm 0mm 100 C 60 C 40 C λ = λ 0(1 + b ) λ 0 =?; b =? 6 ba c ρ [ Ω m m]λ [ ( W m K) ] I I ρb ( λa c ) 8 δ Φ x = 0 x = δ h f 1 f h1 = h f 1 f h1 h f 1 f h1 = = > 56 1
60 Φ=? 64 4000 J kg ρ = 840 kg m d = 80mm λ = 0.5W (m K) 5C 0.6m s h = 6W (m K) 66 r = cm Φ= 5650 W m = 7 C λ = 0.4 W (m K) w
140.5% 7.84kg A = 870cm c = 418.7 J (kg K) ρ = 7840 kg m h = 9.1W (m 600 C 00 C 0 C K) 10 C 15 500 C λ = 10 W (m K) ρ = 700 kg m c = 40 J (kg K) 5 C h = 1 W (m K) 650 C 1min (a) -1 AB A B h B 0min A -5 1000 C 5C 6 h = 115W (m K) δ = 50mm λ = 56.8W (m K) a = 4.1 10 m s 5min (b) -4 d = 170mm 17 C λ = 0 W (m K) a 6 = 6. 10 m s 850 = C h = 141W (m K) 800 C -5 d = 40cm 600 C λ =.W (m K) a 6 = 8.8 10 m s = 0 C h = 18.5W (m K) 450 C
-48 0.1m λ = 0.65 W (m K) ρ = 810 kg m c = 550 J (kg K) 5 C = 45 C h = 6.5 W (m K) 4 50 4-49 0 C 50mm 10mm = 5C h = 10 W (m K) 10 C -54 0 C ρ = 00 kg m c = 700J (kg K) =100 C 10mm min 65 C -57 a 7 = 1.65 10 m s 15 C 0 C 50
4- - 1 4 4-4 0 = 85 C f = 5 C h = 0 W (m K) H = 4cm A = 4cm λ = 0 W (m K) L 4-6 1 1 = a + + τ r r r r ϕ ( i, j) 4-9 h f Φ 1 56910 4-10 4 H = 45mm δ =10mm h = 50 W (m K) 50 W (m f = 0 C λ = K) 0 = 100 C h 4 4 4-4 h f 1 f h1
Φ 1 ( x y)
5-1 δ x ~1 Rex 5-1q = q q w 1 = q w q w1 = 0 w1 w 5-16 1 8 0 C 00 C 6.0m s h = 195W (m K) h =? Pr 5-1 1 = 15m s u 40 W ( m K) h = m n u = 0m s h = 50 W ( m K) Nu = CRe Pr l l = 1m 15m s 0 m s 5-7 50 C ρ = 0.0755 kg m = 10 6 λ 19.4 W ( m K) η = 9.41 10 kg ( m s) 14.6 kj ( kg K) c = 5-0 16cm 1.5m s 10 C p 10 C 14a 5-4100MW 7 C
88 C 14.4 kj kg K c = ( ) 4 η = 0.087 10 kg ( m s) p 5-8 b = 0.5m l = m d = 5mm 98.5% 5 Re =10 60 C 0.15kg s 7.4 C L = 44 kj kg ρ = 770 kg m s 5-4 cm 1cm w = 150 C = 0 C 0 km h m s 5-54.8m s f = 5 C 65 C λ = 98W m K ( ) s d = s d d=10mm 1 = mh 1.5 10 5-600cm 1.75m C 7 C 5 C 5440kJ 5-70 85 C 5 C 5cm Gr Pr 1700 δ
gl 6-1 Ga = r Ja = c ν p ( ) 6- s w 6-9 0 4.4 C 0 C C.5m 6-100.1MPa 70 C 1.m 0cm C 6-1 0mm = 15 C 4.5 10 Pa w 6-17 l n l d = 100 6-10 ) 10 ( w s 5 6-5 0cm1.01 10 Pa.kg
5 6-1.01 10 Pa mm100mm 0V 6-9 c 5mm = 50 s C ρl =1650 kg m pl 4 = 1000 ( K) = 6.85 10 kg ( m s) 0.06 W ( m K) c J kg γ = 6 10 N m η l 5 r = 1.05 10 J kg C = 0.004 s wl = 1. 7 λ = Pr = 11 l l w = 70 C =15 C c 45mm 1 00 ( m )
7-4 1500K µ m 7-6 0mm E = b 5.7 10 W m l = 0.5m 5 1.6 10 m 7-1 15W m 9 7 11 1.9 10 m 1.9 10 m 1.5 10 m 7-17 λ G = 800 W m 7-0mm 4 1A 1 4 10 m T 1 = 1000K l = 0.5m A 1 1.815 10 W A 1
8-8 ab 8-14 s 1 d s d Xs 1 d = 5 8-0 T s = 800K ε s = 1T = p 500K ε 1 p = bs = 0.15m b = p 0.m l = 0.m 1 00K 8-5 1 1 T1 = 550K ε 1 = 0.5 T = 0K 1 X 1, = 0 1 8-40 0K ε = 0.8 0K 8-41 0.5m H =.5m1m
AB 1 8-44 90 C 0.6 W m K = 180 C f 40 ( ) 5 W ( m K) 8-56 0.4m 10 5 Pa 1100 C 500 C CO 0.15
9-5mm1.5mm ( ) i 400 W ( m K) h =5700 W m K h = 1 1m s 50 C 9-4 m 6cm 4cm mm 40 C 0.0016 m s 14 70 C 0.005m s 9-8 q c < q c m1 1 m 9-9 1 = 00 C 1 = 10 C = 100 C = 00 C 1 1-4-4 5 9-10 4 5 9-18 1.5 10 Pa 0mm1mm 1.4 m s 56 C 94 C 9 7 Φ= 1. 10 W
9-1- kg/s 1 = 5 C 0.5kg/s = 5 C = 150 C.8m 9-8 ( ) kg s C ( ) C ( ) 1 ( C) A 1 ( m ) 1.45 10.5 14.1 5.1 0.09 1.45 10.5 1.1 5.6 0.09