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A 6 cm diameter metallic sphere initially at a uniform temperature of 400 °C is placed in a controlled convective environment where the temperature is 80 °C and the convective heat transfer coefficient is 8 W m-2 K-1. The metal has a specific heat capacity of 460 J kg-1 K-1, a thermal conductivity of 35 W m-1 K-1 and a density of 7800 kg m-3.  The time for the metallic sphere to reach a temperature of 100 °C is which of the following values? (You may treat this using the lumped approach.)

A 6 cm diameter metallic sphere initially at a uniform temperature of 400 °C is placed in a controlled convective environment where the temperature is 80 °C and the convective heat transfer coefficient is 8 W m-2 K-1. The metal has a specific heat capacity of 460 J kg-1 K-1, a thermal conductivity of 35 W m-1 K-1 and a density of 7800 kg m-3.  The time for the metallic sphere to reach a temperature of 100 °C is which of the following values? (You may treat this using the lumped approach.)

Elements Of Electromagnetics
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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A 6 cm diameter metallic sphere initially at a uniform temperature of 400 °C is placed in a controlled convective environment where the temperature is 80 °C and the convective heat transfer coefficient is 8 W m-2 K-1. The metal has a specific heat capacity of 460 J kg-1 K-1, a thermal conductivity of 35 W m-1 K-1 and a density of 7800 kg m-3.  The time for the metallic sphere to reach a temperature of 100 °C is which of the following values? (You may treat this using the lumped approach.)

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