The quadrilateral rod without half (material: pure iron), seen in the figure, is immersed in water at a temperature of 20°C by the finite (from its base), while initially at a uniform temperature of 400 °c. h = 400 W / m²K. At point A in the center of the base of the rod, how much will the temperature be after 10 minutes? (Assume that the temperature is scattered on the bar and Fo > 0.2.) 10 cm • A 10 cm 8

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Chapter9: Heat Transfer With Phase Change
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Problem 9.26P
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The quadrilateral rod without half (material: pure iron), seen in the figure, is immersed in water at a
temperature of 20 °C by the finite (from its base), while initially at a uniform temperature of 400 °C.
h = 400 W / m?K. At point A in the center of the base of the rod, how much will the temperature be
after 10 minutes? (Assume that the temperature is scattered on the bar and Fo > 0.2.)
10 cm
• A
10 cm
8
Transcribed Image Text:The quadrilateral rod without half (material: pure iron), seen in the figure, is immersed in water at a temperature of 20 °C by the finite (from its base), while initially at a uniform temperature of 400 °C. h = 400 W / m?K. At point A in the center of the base of the rod, how much will the temperature be after 10 minutes? (Assume that the temperature is scattered on the bar and Fo > 0.2.) 10 cm • A 10 cm 8
Table A-2 | Property values for metals.
Properties at 20°C
Thermal conductivity k, W/m. °C
800°C 1000°C1200°C
1472°F 1832°F 2192°F
ax 105
-100°C
0°C
100°C
200°C
300°C
400°C
600°C
Metal
kg'm
kJ/kg. °C
W/in. °C
m/s
-148°F
32°F
212°F
392°F
572°F
752°F
1112°F
Ahuminum:
Pure
2,707
0.896
204
8.418
215
202
206
215
228
249
Al-Cu (Duralumin),
94-96% Al, 3-5%
Cu, trace Mg
Al-Si (Silumin,
2,787
0.883
164
6.676
126
159
182
194
copper-bearing),
86.5% Al,
1% Cu
2,659
0.867
137
5.933
119
137
144
152
161
Al-Si (Alusil),
78-80% Al,
20-22% Si
2,627
0.854
161
7.172
144
157
168
175
178
Al-Mg-Si, 97% AI,
1% Mg, 1% Si,
1% Mn
2,707
11,373
0.892
177
7.311
175
189
204
Lead
0.130
35
2.343
36.9
35.1
33.4
31.5
29.8
Iron:
Pure
7,897
0.452
73
2.034
87
73
67
62
55
48
40
36
35
36
Wrought iron, 0.5% C
7,849
0.46
59
1.626
59
57
52
48
45
36
33
33
33
Sreet
(C max 1.5%):
Carbon steel
Ce 0.5%
7,833
7,801
7,753
0.465
54
1.474
55
52
48
45
42
35
31
29
31
1.0%
0.473
43
1.172
43
43
42
40
36
33
29
28
29
1.5%
0.486
36
0.970
36
36
36
35
33
31
28
28
29
Transcribed Image Text:Table A-2 | Property values for metals. Properties at 20°C Thermal conductivity k, W/m. °C 800°C 1000°C1200°C 1472°F 1832°F 2192°F ax 105 -100°C 0°C 100°C 200°C 300°C 400°C 600°C Metal kg'm kJ/kg. °C W/in. °C m/s -148°F 32°F 212°F 392°F 572°F 752°F 1112°F Ahuminum: Pure 2,707 0.896 204 8.418 215 202 206 215 228 249 Al-Cu (Duralumin), 94-96% Al, 3-5% Cu, trace Mg Al-Si (Silumin, 2,787 0.883 164 6.676 126 159 182 194 copper-bearing), 86.5% Al, 1% Cu 2,659 0.867 137 5.933 119 137 144 152 161 Al-Si (Alusil), 78-80% Al, 20-22% Si 2,627 0.854 161 7.172 144 157 168 175 178 Al-Mg-Si, 97% AI, 1% Mg, 1% Si, 1% Mn 2,707 11,373 0.892 177 7.311 175 189 204 Lead 0.130 35 2.343 36.9 35.1 33.4 31.5 29.8 Iron: Pure 7,897 0.452 73 2.034 87 73 67 62 55 48 40 36 35 36 Wrought iron, 0.5% C 7,849 0.46 59 1.626 59 57 52 48 45 36 33 33 33 Sreet (C max 1.5%): Carbon steel Ce 0.5% 7,833 7,801 7,753 0.465 54 1.474 55 52 48 45 42 35 31 29 31 1.0% 0.473 43 1.172 43 43 42 40 36 33 29 28 29 1.5% 0.486 36 0.970 36 36 36 35 33 31 28 28 29
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