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Engineering and Tech / Thermodynamics: An Engineering Approach 8 / Chapter 7 / Problem 134P

Thermodynamics: An Engineering Approach | 8th Edition | ISBN: 9780073398174 | Authors: Yunus A. Cengel, Michael A. Boles

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QUESTION:

Problem 134P

Oxygen enters an insulated 12-cm-diameter pipe with a velocity of 70 m/s. At the pipe entrance, the oxygen is at 240 kPa and 20°C; and, at the exit, it is at 200 kPa and 18°C. Calculate the rate at which entropy is generated in the pipe.

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QUESTION:

Problem 134P

Oxygen enters an insulated 12-cm-diameter pipe with a velocity of 70 m/s. At the pipe entrance, the oxygen is at 240 kPa and 20°C; and, at the exit, it is at 200 kPa and 18°C. Calculate the rate at which entropy is generated in the pipe.

ANSWER:

Problem 134P

Oxygen enters an insulated 12-cm-diameter pipe with a velocity of 70 m/s. At the pipe entrance, the oxygen is at 240 kPa and 20; and, at the exit, it is at 200 kPa and 18. Calculate the rate at which entropy is generated in the pipe.

Step by Step Solution

Step 1 of 4

Given

Diameter of the pipe D = 12 cm = 0.12 m

Velocity at inlet of the pipe = 70 m/s

Pressure of at inlet of the pipe = 240 kPa

Temperature of at inlet = 20

=(20 + 273) K

= 293 K

Pressure of at exit of the pipe = 200 kPa

Temperature of at exit of pipe = 18

= (18 + 273) K

= 291 K

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