A cylinder with 15 mm radius, contains an electric resistance heater, is located in an oil of temperature 30 °C, the power per unit length required to maintain a uniform surface temperature of 100 °C is 30 KW/m. Then the convection coefficient is:

A cylinder with 15 mm radius, contains an electric resistance heater, is located in an oil of temperature 30 °C, the power per unit length required to maintain a uniform surface temperature of 100 °C is 30 KW/m. Then the convection coefficient is:

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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Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.

Question

A cylinder with 15 mm radius, contains
an electric resistance heater, is located
in an oil of temperature 30 °C, the power
per unit length required to maintain a
uniform surface temperature of 100 °C
is 30 KW/m. Then the convection
coefficient is:
Select one:
a. 4.55 W/m2.K
b. 4.55 W/m.K
c. 5.45 W/m2.K
d. 4.45 W/m.K
e. None of the mentioned

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