- #1
Filip Kierzek
- 2
- 0
Hi,
Smoluchowski's trap door was proven to fail to obtaining work in a system without heat difference. The problem turns is random movement of trap door due to random particle movements. However I could not find any discussions of such system where the "trap door" did not involve moving parts. I am wandering if it would be possible to construct a specially shaped hole (with no moving parts) in a wall separating two chambers of gas filled box, such that the whole would have a higher likelihood of allowing gas molecules to pass from one way than the other and not involve any moving parts. Intuition suggests that one could shape the hole in such a way so that molecules would be more likely to bounce away / towards the hole e. g. one side being convex and the other side concave.
However existence of such hole should be impossible as it would lead to violation of second law of thermodynamics and extraction of work from system with single heat reservoir. I would appreciate if someone would be kind enough to pinpoint the flaw the above reasoning.
thank you
Filip
Smoluchowski's trap door was proven to fail to obtaining work in a system without heat difference. The problem turns is random movement of trap door due to random particle movements. However I could not find any discussions of such system where the "trap door" did not involve moving parts. I am wandering if it would be possible to construct a specially shaped hole (with no moving parts) in a wall separating two chambers of gas filled box, such that the whole would have a higher likelihood of allowing gas molecules to pass from one way than the other and not involve any moving parts. Intuition suggests that one could shape the hole in such a way so that molecules would be more likely to bounce away / towards the hole e. g. one side being convex and the other side concave.
However existence of such hole should be impossible as it would lead to violation of second law of thermodynamics and extraction of work from system with single heat reservoir. I would appreciate if someone would be kind enough to pinpoint the flaw the above reasoning.
thank you
Filip