# isentropic

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Related to isentropic: Isentropic flow, Polytropic

## isentropic

[¦īs·ən¦träp·ik]
(thermodynamics)
Having constant entropy; at constant entropy.
References in periodicals archive ?
The compressor power is related to the mass flow rate through the compressor [m.sub.c], the isentropic efficiency [[eta].sub.c] and the inlet and outlet temperatures and pressures.
b = 0.164 Btu/ (lb [degrees]F) - coefficient, universal for each isentropic line in the most typical temperatures area: 32[degrees]F <[T.sub.e]< 45[degrees]F, 54[degrees]F < [T.sub.c] < 105[degrees]F (b= 0.688 kJ/kg/[degrees]C; 0[degrees]C < [T.sub.e] < 7.2[degrees]C, 12[degrees]C <[T.sub.c]< 41[degrees]C)
where M is, again, the measured torque around axis of cylinder liner, m is the measured mass flow through the inlet valve, [R.sub.cyl] is the radius of the cylinder, [U.sub.is] is the isentropic valve velocity, [P.sub.R] is the absolute pressure ratio (static outlet pressure/total inlet pressure), R is the gas constant, [gamma] is the specific heat ratio and [T.sub.0] is the upstream stagnation temperature.
The ECMWF interim reanalysis of log(PV) along the 3S5-K isentropic surface during the period of strong intensification for each of the major Atlantic hurricanes of 2017.
Similarly, an in situ compressor isentropic efficiency can be defined as the ratio of the isentropic enthalpy change of the refrigerant stream passing through the compressor to the power consumed by the compressor.
The nominal point corresponds to a maximum of 93.05% of total-to-total isentropic efficiency and 85.63% of total-to-static isentropic efficiency at the nominal speed and reduced mass flow rate of 1.638 x [10.sup.-3][kg x [s.sup.-1][K.sup.0,5][Pa.sup.-1]] which corresponds to a mass flow of 69.5 kg/s.
We mainly use the method of vanishing pressure limits which was introduced by Li  and Chen and Liu [31, 32] in which they studied the formation of delta shocks and vacuum states in the vanishing pressure limit of solutions to the isentropic Euler equations and the concentration and cavitation in the vanishing pressure limit of solutions to the Euler equations for nonisentropic fluids.
The mass fraction of vapor, [x.sub.v], is determined as a function of local pressure p by the isentropic relationship
At standard temperature and pressure conditions, the bulk modulus [B.sub.o] of air is 1.42 x [10.sup.5] Pa for an isentropic process.
The iso-[[theta].sub.e] process is also called an isentropic atmospheric process.
MC inlet pressure of 7.38Mpa and compressor isentropic efficiency of 89% are selected.
Polytropic CAES with one, two, and three stages and an isentropic CAES were considered.

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