Q4) A long steel bar 5 by 10 cm is initially maintained at a uniform temperature of 250 ". It is suddenly subjected to a change such that the environment temperature is lowered to 35 °C. Assuming a heat-transfer coefficient of 23 W/m² °C, use a numerical method to estimate the time required for the center temperature to reach 105 °C. Check this result with a calculation using the Heisler charts.

Q4) A long steel bar 5 by 10 cm is initially maintained at a uniform temperature of 250 ". It is suddenly subjected to a change such that the environment temperature is lowered to 35 °C. Assuming a heat-transfer coefficient of 23 W/m² °C, use a numerical method to estimate the time required for the center temperature to reach 105 °C. Check this result with a calculation using the Heisler charts.

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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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

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Q4) A long steel bar 5 by 10 cm is initially maintained at a uniform temperature
of 250 "C. It is suddenly subjected to a change such that the environment
temperature is lowered to 35 °C. Assuming a heat-transfer coefficient of
23 W/m² °C, use a numerical method to estimate the time required for
the center temperature to reach 105 °C. Check this result with a
calculation using the Heisler charts.

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