In this article, modeling and optimization of power consumption of two–stage compressed air system has been investigated. To do so, the two – stage compressed air cycle with intercooler of FAJR Petroleum Company was considered. This cycle includes two centrifugal compressors, a shell, and a tube intercooler. For modeling of power consumption, actual compressors isentropic efficiencies and inter...

In this article, modeling and optimization of power consumption of two–stage compressed air system has been investigated. To do so, the two – stage compressed air cycle with intercooler of FAJR Petroleum Company was considered. This cycle includes two centrifugal compressors, a shell, and a tube intercooler. For modeling of power consumption, actual compressors isentropic efficiencies and inter...

This paper compares three popular notions of admissibility for weak solutions of the compressible isentropic Euler equations of gas dynamics: (i) the viscosity criterion, (ii) the entropy inequality (the thermodynamically admissible isentropic solutions), and (iii) the viscosity-capillarity criterion. An exact summation of the Chapman-Enskog expansion for Grad's moment system suggests that it i...

Densities ρ, Speeds of sound u, isentropic compressibilities κ s , intermolecular free lengths L f , specific acoustic impedances Z, relative association R a , intermolecular attraction α, excess molar volumes VE, excess isentropic compressibilities κ s E, excess intermolecular free lengths L f E and excess specific acoustic impedances ZE of acetophenone with ethyl cyanoacetate have been report...

Shaw, Keefer, Refsdsl and others (1) have shown that goopotential height is represented on the tcphigrani by an area, and that an isentropic at'mosphere XY (figure l), equal in geopotential height to a given atmosphe,re AB, may be const8ruct8ed by so placing the line XY on the tepliigram t,hat the area XAZ is equal to the area YBZ. The effect of moistmure is normally negligible, but may be allo...

We investigated to what extent the isentropic, non-geostrophic formulation of zonally averaged circulation derived for stratospheric conditions is applicable to climatological transport in the extratropical troposphere and lower stratosphere. The study is based on 10 years of daily data of ECMWF analysis and on the ECHAM3 climate model of the German Climate Computing Centre. The main result is ...

This paper proves the existence of variational rotating solutions to compressible non-isentropic Euler-Poisson equations with prescribed total mass. extends result isentropic case (see Auchmuty and Beals (1971)) case. Compared previous in Wu (2015)), keep constraint finite mass, we establish a new structure equations.

5 The sensitivities of the Brewer-Dobson Circulation (BDC) to different distributions of trop6 ical SST heating are investigated in an idealized aqua-planet model. It is found that an 7 increase in tropical SSTs generally leads to an acceleration of tropical upwelling and an as8 sociated reduction in the Age of Air (AOA) in the polar stratosphere, and that the AOA 9 near the subtropical tropopa...

We construct spherical, hydrostatic models of dense molecular cores and Bok globules consisting of two distinct, spatially separate gas components: a central, isothermal region surrounded by a negative-index, polytropic envelope. The clouds are supported against their own self-gravity by a combination of thermal, mean magnetic, and turbulent wave pressure. The latter two are included by allowin...