an analytical equation of state has been previously modified by papari et al. for representing the volumetric properties of molecular fluids. however the performance of that eos has not been yet well investigated for refrigerant fluids. this study extended that equation to 19 liquid refrigerants to predict their densities at isothermal and saturated states. two temperature-independent parameter...

The prediction of properties in porous materials is of continuing interest in the fields of chemical and materials engineering. Application areas include, among others: (1) the use of supercritical fluids to modify porous materials, (2) physical adsorption of trace components from gaseous effluents, (3) gas storage using microporous materials, and (4) chemical separations using inorganic membra...

A new method for estimating the cubic of equation of state parameters for both pure and mixture fluids without using critical properties is proposed. In this method, the solvation charging free energy and the solvation cavity are used to determine the temperature-dependent energy parameter a(T) and volume parameter b. This method requires only element specific parameters (3 parameters for each ...

CO2 flooding is recognized as an efficient method for enhancing shale oil recovery, while CO2-oil MMP (minimum miscibility pressure) in the micro-nanoscale a crucial parameter. This paper presents calculating MMPs of pure hydrocarbons (C4H10, C6H14, C8H18, and C10H22) systems nanopores (3 nm to 10 nm) with temperature ranging from 290.15 K 373.15 K. Firstly, we modify Peng-Robinson equation sta...

supercritical carbon dioxide has gained increasing attention in food and pharmaceutical processing owing to the fact that it is environmentally inexpensive, not flammable, essentially non-toxic, and it has a convenient critical point. also, it has been attracting much attention in many fields, such as extraction of sensitive materials and pharmaceutical processing and polymerization processes. ...

in this contribution, two approaches are followed to predict the saturated liquid density of liquefied natural gas (lng) mixtures. in one approach, 12 cubic equations of state (eoss), comprising the popular peng-robinson (pr) and redlich-kwong-soave (rks), are employed to predict the saturated liquid density of 20 lng mixtures. in the other approach, these eos are used in conjunction with a rec...

Abstract Positive displacement expanders are widely investigated and theirs models commonly use the REFPROP database to evaluate fluid properties. However, estimating procedures in CFD using result heavy of CPU time. Therefore, a study has been carried out determine if simpler methods for property estimation suitable. The ANSYS CFX solver used includes number cubic equations state, namely, Redl...