1-) Air at a temperature of 10 °C flows with a volume flow of 50 L/sec in a horizontal pipe with a diameter of 12 cm and a length of 5 m with ε=2.10-5 m roughness and an inner surface temperature of 50 °C. Assuming that the flow is fully developed, calculate a) the average temperature of the air at the outlet plane, b) the amount of heat transfer. 2-) Calculate the rate at which the average friction coefficient, friction force and heat transfer rate will change if the free flow rate of the turbulent air flowing parallel to the plate over a smooth plate is doubled. Does the result change for constant temperature and constant heat flux conditions; Please evaluate. 3-) A person produces an average of 70 W of heat and loses a quarter of this heat from the head area by natural convection and radiation. Calculate the amount of heat transfer that takes place by a) natural convection and b) radiation in a room at 20 °C, considering the human head as a sphere with a diameter of 25 cm at 35 °C.
1-) Air at a temperature of 10 °C flows with a volume flow of 50 L/sec in a horizontal pipe with a diameter of 12 cm and a length of 5 m with ε=2.10-5 m roughness and an inner surface temperature of 50 °C. Assuming that the flow is fully developed, calculate a) the average temperature of the air at the outlet plane, b) the amount of heat transfer. 2-) Calculate the rate at which the average friction coefficient, friction force and heat transfer rate will change if the free flow rate of the turbulent air flowing parallel to the plate over a smooth plate is doubled. Does the result change for constant temperature and constant heat flux conditions; Please evaluate. 3-) A person produces an average of 70 W of heat and loses a quarter of this heat from the head area by natural convection and radiation. Calculate the amount of heat transfer that takes place by a) natural convection and b) radiation in a room at 20 °C, considering the human head as a sphere with a diameter of 25 cm at 35 °C.
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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1-) Air at a temperature of 10 °C flows with a volume flow of 50 L/sec in a horizontal pipe with a diameter of 12 cm and a length of 5 m with ε=2.10-5 m roughness and an inner surface temperature of 50 °C. Assuming that the flow is fully developed, calculate a) the average temperature of the air at the outlet plane, b) the amount of heat transfer.
2-) Calculate the rate at which the average friction coefficient, friction force and heat transfer rate will change if the free flow rate of the turbulent air flowing parallel to the plate over a smooth plate is doubled. Does the result change for constant temperature and constant heat flux conditions; Please evaluate.
3-) A person produces an average of 70 W of heat and loses a quarter of this heat from the head area by natural convection and radiation. Calculate the amount of heat transfer that takes place by a) natural convection and b) radiation in a room at 20 °C, considering the human head as a sphere with a diameter of 25 cm at 35 °C.
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