Correlation of Pure Water Saturation Properties by Equations of State Using the Association Concept

2014 ◽  
Author(s):  
F. Forouzanfar ◽  
A.P. Pires ◽  
A.C. Reynolds
Keyword(s):  
Equations Of State ◽  
Water Saturation ◽  
Pure Water ◽  
Saturation Properties

Saturation Properties from Equations of State

2003 ◽  
Vol 42 (16) ◽  
pp. 3838-3844 ◽  
Author(s):  
Philip T. Eubank ◽  
Xiaonian Wang
Keyword(s):  
Equations Of State ◽  
Saturation Properties

Modeling Water Saturation Points in Natural Gas Streams Containing CO2 and H2S—Comparisons with Different Equations of State

2015 ◽  
Vol 54 (2) ◽  
pp. 743-757 ◽  
Author(s):  
Letícia C. dos Santos ◽  
Samir S. Abunahman ◽  
Frederico W. Tavares ◽  
Victor R. R. Ahón ◽  
Georgios M. Kontogeorgis
Keyword(s):  
Natural Gas ◽  
Equations Of State ◽  
Water Saturation ◽  
Gas Streams

scholarly journals Ab initio based equation of state of dense water for planetary and exoplanetary modeling

2019 ◽  
Vol 621 ◽  
pp. A128 ◽  
Author(s):  
S. Mazevet ◽  
A. Licari ◽  
G. Chabrier ◽  
A. Y. Potekhin
Keyword(s):  
Equation Of State ◽  
First Principles ◽  
Equations Of State ◽  
Pure Water ◽  
Analytical Form ◽  
Quantum Molecular Dynamics ◽  
Dense Water ◽  
Wide Range ◽  
Dynamical Simulations ◽  
Dynamics Simulations

Context. The modeling of planetary interiors requires accurate equations of state (EOSs) for the basic constituents with proven validity in the difficult pressure–temperature regime extending up to 50 000 K and hundreds of megabars. While EOSs based on first-principles simulations are now available for the two most abundant elements, hydrogen and helium, the situation is less satisfactory for water where no wide-range EOS is available despite its requirement for interior modeling of planets ranging from super-Earths to planets several times the size of Jupiter. Aims. As a first step toward a multi-phase EOS for dense water, we develop a temperature-dependent EOS for dense water covering the liquid and plasma regimes and extending to the super-ionic and gas regimes. This equation of state covers the complete range of conditions encountered in planetary modeling. Methods. We use first-principles quantum molecular dynamics simulations and the Thomas-Fermi extension to reach the highest pressures encountered in giant planets several times the size of Jupiter. Using these results, as well as the data available at lower pressures, we obtain a parametrization of the Helmholtz free energy adjusted over this extended temperature and pressure domain. The parametrization ignores the entropy and density jumps at phase boundaries but we show that it is sufficiently accurate to model interior properties of most planets and exoplanets. Results. We produce an EOS given in analytical form that is readily usable in planetary modeling codes and dynamical simulations (a fortran implementation is provided). The EOS produced is valid for the entire density range relevant to planetary modeling, for densities where quantum effects for the ions can be neglected, and for temperatures below 50 000K. We use this EOS to calculate the mass-radius relationship of exoplanets up to 5000 MEarth, explore temperature effects in the wet Earth-like, ocean planets and pure water planets, and quantify the influence of the water EOS for the core on the gravitational moments of Jupiter.

Interfacial Water Transport and Embrittlement in Polymer-Matrix Composites

1993 ◽  
Vol 304 ◽  
Author(s):  
A. Lekatou ◽  
Y. Qian ◽  
S. E. Faidi ◽  
S. B. Lyon ◽  
N. Islam ◽  
...  
Keyword(s):  
Water Transport ◽  
Polymer Matrix ◽  
Volume Fraction ◽  
Water Saturation ◽  
Polymer Matrix Composites ◽  
Pure Water ◽  
Fickian Diffusion ◽  
Interfacial Water ◽  
Matrix Composites ◽  
Electrical Measurements

AbstractDisordered glass microsphere-epoxy composites have been used in a study of diffusional, electrical and mechanical effects of interfaces in polymer-matrix composites exposed to pure water. Mass gain measurements on composites manufactured from 10 μm silane-treated microspheres indicate initial near-Fickian diffusion with water saturation times on the order of 500 h. However, electrical measurements indicate water transport at rates at least 100 times more rapid. This behaviour is interpreted in terms of a cellular microstructure with areas of low cross-link density separating highly cross-linked areas. Rapid water transport can thus occur in areas of low cross-linking, even without the contribution of connected clusters of particles where rapid interfacial water transport occurs substantially ahead of the main diffusion front. Reductions in ultimate tensile strength and fracture energy in dry and water-saturated tensile test specimens are observed with increasing volume fraction of glass spheres but with a distinct plateau between about 6% and 12% Vf. This can be explained in terms of secondary cracking below the percolation threshold which causes toughening of the composite. However, a few % above pc (≍ 16%), most particles belong to the percolating cluster and the primary crack can grow without hindrance.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

TPT2 and SAFTD equations of state for mixtures of hard chain copolymers

2000 ◽  
Vol 98 (24) ◽  
pp. 2045-2052
Author(s):  
Keshawa P. Shukla, Walter G. Chapman
Keyword(s):  
Equations Of State

Characteristics of Negative Lightning Impulse Breakdown Voltage in Pure Water

2018 ◽  
Vol 138 (8) ◽  
pp. 441-448 ◽  
Author(s):  
Norimitsu Takamura ◽  
Nobutaka Araoka ◽  
Seiya Kamohara ◽  
Yuta Hino ◽  
Takuya Beppu ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
Pure Water ◽  
Lightning Impulse
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