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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4-57 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 90°C. Check this result with a calculation using the Heisler charts.
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