isentropic expansion

isentropic expansion

[¦īs·ən′träp·ik ik′span·chən]
(thermodynamics)
Expansion which occurs without any change in entropy.
References in periodicals archive ?
Therefore, comparisons should be made between ASTEC_REF and MAAP_SEN for the isentropic expansion and between ASTEC_SEN and MAAP_REF for the isothermal expansion of the accumulators.
The process 3-4 is an isentropic expansion process, in which the pressure is reduced to 4.4 bar and volume is increased to 0.985 [m.sup.3].
Moreover, the gas rate at the nozzle inlet increases by using the ARC, and the system has potential to recover more expansion energy which is the enthalpy difference at isentropic expansion. This energy provides the source of energy for pressure boost by the ejector.
The change in total pressure is calculated via isentropic assumptions/losses where the static enthalpy of air at the stator exit under isentropic expansion ([h.sub.1i]) is calculated as:
The process 4-5 is an irreversible expansion and internal irreversibilities were considered, while the process 4-5 s is an isentropic expansion. The heat rejection occurs in the process 5-1 (at constant pressure) and the cycle is completed.
The first wave takes place in the first fm/c of the collisions when gluons thermalize into quark-gluon plasma (QGP), and the second wave ensues at hadronization, 5-10 fm/c, after a roughly isentropic expansion that roughly conserves the number of quarks [11].
The estimated isentropic efficiency of the turbine was then calculated knowing the enthalpy at State 3, the actual enthalpy at State 4, and the enthalpy at State 4, assuming isentropic expansion. The entropy and temperature were then determined using the enthalpy and pressure values.
One method for increasing the efficiency of a [CO.sub.2] cycle is to approach isentropic expansion with a work-recovery machine (expander) rather than isenthalpic expansion with an orifice-type expansion device.
Refrigeration and liquefaction - the production of low temperatures will be presented during the short course, including basic principles of low temperature production (the heat engine, efficiency concepts); Joule-Thomson expansion; isentropic expansion; and cryocoolers, regenerative cycles and pulse tubes.
Decompression of high-pressure gas was always followed by a temperature drop due to the Joule-Thomson effect or isentropic expansion. The temperature change will affect the physical properties of the saturated polymer-gas system, which will affect the degree of supersaturation of that system.
Isenthalpic expansion imposes a two-fold penalty on cycle performance compared with isentropic expansion in the Carnot cycle: the cooling capacity is reduced and the compressor work is increased.
The release of vapor jets can be approximated well assuming an isentropic expansion (reversible and adiabatic).