In thermodynamics, an isentropic process is an idealized thermodynamic process that is both adiabatic and reversible. The work transfers of the system are frictionless, and there is no net transfer of heat or matter. Such an idealized process is useful in engineering as a model of and basis of comparison for real processes. This is idealized as reversible processes do not occur in reality; thinking of a process as both adiabatic and reversible would show that the initial and final entropies are the same, thus, the reason it is called isentropic (entropy does not change). Thermodynamic processes are named based on the effect they would have on the system (ex. isovolumetric: constant volume, isenthalpic: constant enthalpy). Even though in reality it is not necessarily possible to carry out an isentropic process, some may be approximated as such.
The word "isentropic" can be interpreted in another way, since its meaning is deducible from its etymology. It means a process in which the entropy of the system remains unchanged, as mentioned this requires the process to be both adiabatic and reversible. However, this could also occur in a system where the work done on the system includes friction internal to the system, and heat is withdrawn from the system in just the right amount to compensate for the internal friction, so as to leave the entropy unchanged. However, in relation to the universe, the entropy of the universe would increase as a result.
been reading in many books that polytropic efficiency is always recommended over isentropic efficiency.
what are the advantages of using polytropic efficiency?
what makes it different from isentropic efficiency?
it is also told that polytropic efficiency is independent of pressure...
Homework Statement
A mass of 0.45 kg of a perfect gas with a ratio of specific heats of 1.41 expands isentropically by means of a reversible non-flow process from an initial pressure of 10 bar and temperature 622oC to a temperature of 331 oC whilst generating 85 kJ of work. The specific heat...
Trying to assess how relative humidity impacts COT, compressor outlet temperature, on a turbo charger compressor.
It appears that humdity reduces gamma in the temp prediction formula, thus reducing COT. Dry air results in increased COT, and humdity reduces it.
Any opinions on this?
Hey guys,
I have been given that the isentropic efficiency of a nozzle = 90%. Inlet condictions are: 5MPa and 550°C and exit: 100kPa.
Now \eta_{n}(h_{i} - h_{0}) = V^{2}_{i}/2
h(o) - h(i) is the enthalpy drop across the turbine.
Now next they say that s(o) = s(i). Now how can the entropy at...
Hi all.
We are to compare the effect of a shock wave, that is the irreversibilities associated.
We have comptued that the upstream and downstream velocities of a shock wave are 1029 m/s and 266.8 m/s respectively.
The upstream pressure and temperature is 105kPa and 290K.
What question...
Hi all.
We are to compare the effect of a shock wave, that is the irreversibilities associated.
We have comptued that the upstream and downstream velocities of a shock wave are 1029 m/s and 266.8 m/s respectively.
The upstream pressure and temperature is 105kPa and 290K.
What question...
Hi, I have some questions regarding thermo:
1) Does an isentropic process have to be a quasistatic one? What is the relation between equilibrium and reversibilty?
2) Naturally, there are revesible processes involving control volumes. A gas can go through an isentropic process in a reversible...