4-57 A long steel bar 5 by 10 cm is initially maintained at a uniform temperature of250°C. It is suddenly subjected to a change such that the environment temperatureis lowered to 35°C. Assuming a heat-transfer coefficient of 23 W/m2 . °C, use anumerical method to estimate the time required for the center temperature to reach90°C. Check this result with a calculation using the Heisler charts.

given:length of steel bar =5/10cmTi=2500Cenviroment temperature T∞=350Cfrom table K=43W/mkheat…

Answered: - 10 cm is initially main subjected to…

Engineering

Mechanical Engineering

- 10 cm is initially main subjected to a change su Assuming a heat-transfer

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

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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