We constructed several sequences of classical Cepheid envelope models at solar chemical composition (Y = 0.28, Z = 0.02) to investigate the dependence of the pulsation properties predicted by linear and nonlinear hydrodynamical models on input physics. To study the dependence on the equation of state (EOS) we performed several numerical experiments by using the simplified analytical EOS origina...

A framework to self-consistently combine a classical equation of state (EoS) and molecular force field model polymers polymer mixtures is presented. The statistical associating fluid theory (SAFT- γ Mie) used correlate the thermophysical properties oligomers generate robust transferrable coarse-grained (CG) parameters which can be both in particle based simulations equations calculations. Examp...

This work demonstrates the need for accurate thermodynamic models to reliably quantify changes in thermophysical properties of natural gas when blended with hydrogen. For this purpose, a systematic evaluation was carried out on predictive accuracy three well-known models, Peng–Robinson equation state (EoS), multiparameter empirical GERG-2008 model, and molecular-based polar soft-SAFT EoS, descr...

Small changes in temperature or pressure can lead to crude oil phase separation and multiple orders of magnitude change viscosity. The one-parameter friction theory framework using the SARA-based method with perturbed-chain statistical association fluid (PC-SAFT) EoS has proven have high accuracy viscosity predictions light oil. However, it failed for heavy In this work, above model is modified...

Electrolyte thermodynamics is a complex and broad subject of immense importance in very diverse applications. The models proposed for electrolyte solutions have some similarities to those non-electrolytes but also significant differences. Not just due additional contributions because the way are developed electrolytes vs. non-electrolytes. Moreover, there still fundamental issues unresolved the...

From the presented experimental data of two CO2-rich mixtures containing SO2 and CO as impurities anthropogenic CO2, we evaluated impact simultaneous presence these on transport, injection storage carbon capture (CCS) technology. We determined density, vapor-liquid equilibrium speed sound a cocapture mixture (non-purified captured flue gas) [CO2 + 4.93 mol% 3.01 CO] representative European emis...

The cubic-plus-association (CPA) model is an equation of state (EoS) that combines the Soave−Redlich−Kwong (SRK) equation with the association term from Wertheim’s theory as used in statistical associating fluid theory (SAFT). In the form used here, the CPA EoS does not include separate terms for the polar and quadrupolar contributions. The capabilities and limitations of the CPA model when it ...

SAFT is perhaps the most versatile, fundamentally, based engineering equation of state in use today. However, in common with all analytic equations of state, SAFT exhibits classical behavior in the critical region rather than the non-analytical, singular behavior seen in real fluids. Recently, so-called crossover equations of state have been developed which solve this shortcoming by incorporati...

The use of a binary cycle coupled to the complete reinjection non-condensable gases could provide valid answer improvement sustainability geothermal plants. In recent years, interest in CO2 as working fluid transcritical cycles has increased. However, low critical temperature carbon dioxide (?30 °C) requires cooling cycle, temperatures below 15 °C, which are not always available. this work, ove...