What is a reversible adiabatic expansion?

What is a reversible adiabatic expansion?

Reversible adiabatic process is also called an Isentropic Process. It is an idealized thermodynamic process that is adiabatic and in which the work transfers of the system are frictionless; there is no transfer of heat or of matter and the process is reversible.

What is meant by adiabatic reversible expansion of an ideal gas?

An adiabatic process is one in which no heat enters or leaves the system, and hence, for a reversible adiabatic process the first law takes the form dU = − PdV. Thus for a reversible adiabatic process and an ideal gas, CVdT = −PdV. (The minus sign shows that as V increases, T decreases, as expected.)

What is adiabatic expansion of an ideal gas?

For an adiabatic free expansion of an ideal gas, the gas is contained in an insulated container and then allowed to expand in a vacuum. Because there is no external pressure for the gas to expand against, the work done by or on the system is zero.

What is reversible expansion of an ideal gas?

Hence, a reversible isothermal expansion is an infinitely-slow increase in volume at constant temperature. All the reversible isothermal PV work wrev done by an ideal gas to expand was possible by reversibly absorbing heat qrev into the ideal gas.

What is an example of a reversible adiabatic process?

An example of a reversible adiabatic process is compressing/expanding a gas so rapidly that there is no time for heat transfer to the surroundings, but below the speed of sound so that uneven pressure distributions don’t build up in the gas. The compression/expansion must also be frictionless.

An adiabatic (zero heat exchanged with the surroundings) process is reversible if the process is slow enough that the system remains in equilibrium throughout the process.

No, all adiabatic processes are not reversible. There is a special name for reversible adiabatic processes – these are called isentropic processes.

adiabatic process, in thermodynamics, change occurring within a system as a result of transfer of energy to or from the system in the form of work only; i.e., no heat is transferred. A rapid expansion or contraction of a gas is very nearly adiabatic. Adiabatic processes cannot decrease entropy. …

What is the reversible process of expansion?

Some examples of reversible processes are uniform and slow expansion or compression of a fluid, such as fluid flows in a well-designed turbine, compressor, nozzle, or diffuser. Reversible processes is differentially removed from equilibrium with no (appreciable) internal temperature, pressure, and velocity changes.

What is isothermal reversible expansion of an ideal gas?

Hint: Isothermal expansion is change in the system in which temperature remains constant. In such an expansion change in the system will be very slow that there will be enough time to adjust temperature so that initial temperature will be equal to final temperature.

A reversible process is a process wherein quantity of heat transferred is directly proportional to the systems entropy change. Since there is no entropy change, the heat transferred is zero. Thus this process is an adiabatic reversible process. These processes are also called iso entropic processes.

How do temperature and volume vary during reversible adiabatic expansion?

This shows how temperature and volume of an ideal gas vary during a reversible adiabatic expansion or compression. If the gas expands, the temperature goes down. If the gas is compressed, it becomes hot. Of course the pressure varies also, and the ideal gas conforms to the equation PV/T = constant.

What is the formula for reversible expansion of an ideal gas?

8.4: Reversible Adiabatic Expansion of an Ideal Gas. An adiabatic process is one in which no heat enters or leaves the system, and hence, for a reversible adiabatic process the first law takes the form dU = − PdV. But from equation 8.1.1, CV = (∂U/∂T)V.