Everything about Reversible Process Thermodynamics totally explained
» For articles on other forms of reversibility, including reversibility of microscopic dynamics, see reversibility (disambiguation).
In
thermodynamics, a
reversible process, or
reversible cycle if the process is cyclic, is a process that can be "reversed" by means of
infinitesimal changes in some property of the system without loss or
dissipation of energy. Due to these infinitesimal changes, the system is at
rest throughout the entire process. Since it would take an infinite amount of time for the process to finish, perfectly reversible processes are impossible. However, if the system undergoing the changes responds much faster than the applied change, the deviation from reversibility may be negligible. In a reversible cycle, the system and its surroundings will be exactly the same after each cycle.
An alternative definition of a
reversible process is a process that, after it has taken place, can be reversed and causes no change in either the
system or its surroundings. In thermodynamic terms, a process "taking place" would refer to its transition from its initial
state to its final state.
Irreversibility
irreversible. In an irreversible process, finite changes are made; therefore the system isn't at equilibrium throughout the process. At the same point in an irreversible cycle, the system will be in the same state, but the surroundings are permanently changed after each cycle. Although the system has been driven from its equilibrium state by only an infinitesimal amount, heat has been irreversibly lost due to friction, and can't be recovered by simply moving the piston infinitesimally in the opposite direction.
Engineering archaisms
Historically, the term
Tesla principle was used to describe (amongst other things) certain reversible processes invented by
Nikola Tesla. However, this phrase is no longer in conventional use. The principle was that some systems could be reversed and operated in a complementary manner. It was developed during Tesla's research in
alternating currents where the current's magnitude and direction varied cyclically. During a demonstration of the
Tesla turbine, the disks revolved and machinery fastened to the shaft was operated by the engine. If the turbine's operation was reversed, the disks acted as a
pump.
Further Information
Get more info on 'Reversible Process Thermodynamics'.
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