Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Question

a) A 50 mm diameter carbon steel tube (ρ=7833 kg/m³; Cp = 465 J/kg.K, k = 54 W/mK) at an initial uniform temperature of 18°C ​​is heated in an oven with air circulation that is at a temperature of 250°C and has a convection heat transfer coefficient of 45 W/m².K. How long must the tube be in the oven for the surface temperature to reach 100°C?

b) The figure below illustrates the temperature distribution inside a flat solid at two instants for two different situations (A and B). In both situations is there heat transfer? What causes them to behave differently?

5°C 15°C 20°C| 5°C 15°C 20°C| 5°C 15°C 20°C| A 5°C 15°C 20°C А 5°C 15°C 20°C 5°C 15°C 20°C| 5°C 15°C 20°C 5°C 15°C 20°C| 3°С 12°C 17°C В°С 12°С 17°C 3°С 12°C 17°C| 3°С 12°С 17°С 3°С 12°С 17°C 3°С 12°С 17°C 3°С 12°С 17°С В°С 12°С 17°С| t1 (s) t2 (s) 5°C 5°C 5°C 5°C 5°C 5°С 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C В t1 (s) t2 (s)
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Transcribed Image Text:5°C 15°C 20°C| 5°C 15°C 20°C| 5°C 15°C 20°C| A 5°C 15°C 20°C А 5°C 15°C 20°C 5°C 15°C 20°C| 5°C 15°C 20°C 5°C 15°C 20°C| 3°С 12°C 17°C В°С 12°С 17°C 3°С 12°C 17°C| 3°С 12°С 17°С 3°С 12°С 17°C 3°С 12°С 17°C 3°С 12°С 17°С В°С 12°С 17°С| t1 (s) t2 (s) 5°C 5°C 5°C 5°C 5°C 5°С 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 5°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C 15°C В t1 (s) t2 (s)
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