(b) Stainless steel ball bearings (p = 8085 kg/m³ and cp= 0.480 kJ/kg°C) having a diameter of 1.22 cm are to be quenched in water at a rate of 1402 per minute. The balls leave the oven at a uniform temperature of 900°C and are exposed air at 30°C for a while before they are dropped into the water. If thetemperature of the balls drops to 855°C prior to quenching, determine: (i) The rate of heat transfer from the balls to the air; and (ii) The rate of entropy generation due to heat loss from the balls to the air.

(b) Stainless steel ball bearings (p = 8085 kg/m³ and cp= 0.480 kJ/kg°C) having a diameter of 1.22 cm are to be quenched in water at a rate of 1402 per minute. The balls leave the oven at a uniform temperature of 900°C and are exposed air at 30°C for a while before they are dropped into the water. If thetemperature of the balls drops to 855°C prior to quenching, determine: (i) The rate of heat transfer from the balls to the air; and (ii) The rate of entropy generation due to heat loss from the balls to the air.

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

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

(b)
Stainless steel ball bearings (p = 8085 kg/m³ and c, = 0.480 kJ/kg°C) having a
diameter of 1.22 cm are to be quenched in water at a rate of 1402 per minute.
The balls leave the oven at a uniform temperature of 900°C and are exposed
air at 30°C for a while before they are dropped into the water. If thetemperature of the balls
drops to 855°C prior to quenching, determine:
(i)
The rate of heat transfer from the balls to the air; and
(ii)
The rate of entropy generation due to heat loss from the balls to the air.

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