Question

For a real gas passing through an insulated throttling valve, the outlet temperature of the gas \(\underline{\hspace{2cm}}\) with respect to the inlet temperature.

• A. is always higher
• B. is always lower
• C. may be higher, lower or same
• D. is always same

Hint:

For throttling processes, the change in temperature depends on the gas's Joule-Thomson coefficient, which can vary with pressure and temperature.

Answer 1

The Correct Option is C

When a real gas passes through a throttling valve, the process is adiabatic (no heat exchange) and involves a drop in pressure. The outlet temperature of the gas after throttling depends on the specific properties of the gas, including its compressibility factor. For most real gases, the temperature change during throttling can vary:
- In some cases, the temperature may increase (for gases with a Joule-Thomson coefficient greater than 0).
- In other cases, the temperature may decrease (for gases with a negative Joule-Thomson coefficient).
- In some cases, there may be no temperature change at all (for gases that exhibit ideal behavior at the given conditions).
Thus, the outlet temperature may be higher, lower, or the same as the inlet temperature. Hence, the correct answer is \( (C) \) may be higher, lower, or same. Final Answer: (C) may be higher, lower or same