Air at 200 kPa, 52°C, and a velocity of 355 m/s enters an insulated duct of varying cross-sectional area. The air exits at 100 kPa, 82°C.At the inlet, the cross-sectional area is 6.57 cm².Assuming the ideal gas model for the air, determine:(a) the exit velocity, in m/s.(b) the rate of entropy production within the duct, in kW/K.

Answered: Image /qna-images/answer/e1df0ef5-3099-491b-a4a1-0b64f269caac.jpg

Answered: Air at 200 kPa, 52°C, and a velocity of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Three pounds of a perfect gas with R = 38 ft-lb/lb-R and K = 1.667 have 300 Btu of heat added during a reversible nonflow constant pressure change of state. The initial temperature is 100 degrees Fahrenheit.. What is the final temperature?
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A quantity of an ideal gas in an isolated system expanded isothermally and reversibly at 400 K from a volume V1 to a volume V2. During the expansion, the gas absorbs 200 J of heat from the reservoir in contact with it. If the gas expanded freely V1 to a volume V2 at 400 K and absorbed 100 J of heat, what will be: (a) the entropy change of the gas; (b) the entropy change of the reservoir, and (c) the entropy change of the whole system. Answer: (0.50, 0, 0.50)
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A rigid tank containing air is subjected to a reversible process in which it is heated from its initial state at T1 = 600 K and P1 = 1.5 bar to a final state with P, = 4.352 psi. Assuming that air can be modelled as an ideal gas, determine the specific change in entropy As12. (kJ/kg-K). Your Answer:

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