Answered: 50 mm diameter carbon steel tube…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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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