Temat: thermodynamics properties - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Structural, Mechanical and Thermodynamic Properties Under Pressure Effect of Rubidium Telluride: First Principle Calculations
Autorzy:: Bidai, K.
Ameri, M.
Ameri, I.
Bensaid, D
Slamani, A.
Zaoui, A.
Al-Douri, Y.
Powiązania:: https://bibliotekanauki.pl/articles/354182.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Anti-fluorite: Rb2Te; FP-LAPW; GGA
structural properties
thermodynamics properties
elastic constants
Opis:: First-principles density functional theory calculations have been performed to investigate the structural, elastic and thermodynamic properties of rubidium telluride in cubic anti-fluorite (anti-CaF₂-type) structure. The calculated ground-state properties of Rb₂Te compound such as equilibrium lattice parameter and bulk moduli are investigated by generalized gradient approximation (GGA-PBE) that are based on the optimization of total energy. The elastic constants, Young’s and shear modulus, Poisson ratio, have also been calculated. Our results are in reasonable agreement with the available theoretical and experimental data. The pressure dependence of elastic constant and thermodynamic quantities under high pressure are also calculated and discussed.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2A; 865-871
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Developing novel correlations for calculating natural gas thermodynamic properties
Autorzy:: Farzaneh-Gord, M.
Rahbari, H.R.
Powiązania:: https://bibliotekanauki.pl/articles/185843.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: termodynamika
gaz ziemny
natural gas
thermodynamics
novel correlations
real time properties
Opis:: Natural gas is a mixture of 21 components and it is widely used in industries and homes. Knowledge of its thermodynamic properties is essential for designing appropriate processes and equipment. This paper presents simple but precise correlations of how to compute important thermodynamic properties of natural gas. As measuring natural gas composition is costly and may not be effective for real time process, the correlations are developed based on measurable real time properties. The real time properties are temperature, pressure and specific gravity of the natural gas. Calculations with these correlations are compared with measured values. The validations show that the average absolute percent deviation (AAPD) for compressibility factor calculations is 0.674%, for density is 2.55%, for Joule-Thomson coefficient is 4.16%. Furthermore, in this work, new correlations are presented for computing thermal properties of natural gas such as enthalpy, internal energy and entropy. Due to the lack of experimental data for these properties, the validation is done for pure methane. The validation shows that AAPD is 1.31%, 1.56% and 0.4% for enthalpy, internal energy and entropy respectively. The comparisons show that the correlations could predict natural gas properties with an error that is acceptable for most engineering applications.
Źródło:: Chemical and Process Engineering; 2011, 32, 4; 435-452
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Dostawca treści:: Biblioteka Nauki

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