Questions from Thermal Fluid Science

Q: An ideal gas undergoes a process between two specified temperatures, first

An ideal gas undergoes a process between two specified temperatures, first at constant pressure and then at constant volume. For which case will the ideal gas experience a larger entropy change? Expla...

Q: What is the difference between entropies of oxygen at 150 kPa and

What is the difference between entropies of oxygen at 150 kPa and 39°C and oxygen at 150 kPa and 337°C on a per-unit-mass basis?

Q: Air is expanded from 200 psia and 500°F to 100

Air is expanded from 200 psia and 500°F to 100 psia and 50°F. Assuming constant specific heats, determine the change in the specific entropy of air.

Q: Determine the final temperature when air is expanded isentropically from 1000 kPa

Determine the final temperature when air is expanded isentropically from 1000 kPa and 477°C to 100 kPa in a piston–cylinder device.

Q: Air is expanded isentropically from 100 psia and 500°F to

Air is expanded isentropically from 100 psia and 500°F to 20 psia in a closed system. Determine its final temperature.

Q: Which of the two gases—helium or nitrogen—has the

Which of the two gases—helium or nitrogen—has the higher final temperature as it is compressed isentropically from 100 kPa and 25°C to 1 MPa in a closed system?

Q: Which of the two gases—neon or air—has the

Which of the two gases—neon or air—has the lower final temperature as it is expanded isentropically from 1000 kPa and 500°C to 100 kPa in a piston–cylinder device?

Q: A 1.5-m3 insulated rigid tank contains 2.

A 1.5-m3 insulated rigid tank contains 2.7 kg of carbon dioxide at 100 kPa. Now paddle-wheel work is done on the system until the pressure in the tank rises to 150 kPa. Determine the entropy change of...

Q: Explain why the light-year has the dimension of length.

Explain why the light-year has the dimension of length.

Q: The density of atmospheric air varies with elevation, decreasing with increasing

The density of atmospheric air varies with elevation, decreasing with increasing altitude. (a) Using the data given in the table, obtain a relation for the variation of density with elevation, and cal...