AMME2262 Lecture Notes - Lecture 8: Clausius Theorem, Perpetual Motion, Thermal Engineering

• School: University of Sydney
• Department: Aeronautical Engineering (Mechanical)
• Course: AMME2262
• Professor: matthew dunn

Document Summary

Reversible and irreversible processes: reversible process: a process that can be reversed without leaving any trace on the surroundings, deliver the most and consume the least work. Irreversible process: a process that is not reversible. Irreversibilities: factor that cause a process to be irreversible: friction, unrestrained expansion, mixing of two fluids, heat transfer across a finite temperature difference, electric resistance, inelastic deformation of solids and chemical reactions. If no irreversibilities occur within the boundaries of a process, it is internally reversible. If no irreversibilities occur outside the boundaries of a process, it is externally reversible. If no irreversibilities occur within or outside the boundaries of a process, it is totally reversible: no heat transfer through a finite temperature difference, no non-quasi-equilibrium changes, no friction or other dissipative effects. The first carnot principle: the efficiency of an irreversible heat engine is always less than the efficiency of a reversible one operating between the same two reservoirs.