Theoretical Determination of Pressure-Volume-Temperature Relationship of Some Alkali Halides

2008 ◽  
Vol 272 ◽  
pp. 107-116
Author(s):  
Quan Liu
Keyword(s):  
Alkali Halides ◽  
Temperature Relationship ◽  
Grüneisen Parameter ◽  
Gruneisen Parameter ◽  
Volume Dependence ◽  
Compression Data ◽  
Experimental Values ◽  
Relationship Of ◽  
Good Agreement

The Chopelas-Boehler approximation for the volume dependence of the Anderson-Gruneisen parameter along isotherms and the new approximation for the volume dependence of the Anderson-Gruneisen parameter along isobars have been used to study the pressure-volume-temperature relationship for LiF, NaF and CsCl crystals up to a pressure of 90kbar and in the temperature range 298-1073K. The calculated values of compression data and experimental values are found to be in good agreement.

VOLUME DEPENDENCE OF GRUNEISEN PARAMETER FOR SOLIDS

2008 ◽  
Vol 22 (31) ◽  
pp. 3113-3123 ◽  
Author(s):  
S. K. SHARMA
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Empirical Relationship ◽  
Grüneisen Parameter ◽  
Thermal Pressure ◽  
Gruneisen Parameter ◽  
Modified Model ◽  
Volume Dependence ◽  
Good Agreement

The present paper proposes a new empirical relationship to predict the values of volume dependence of the Gruneisen parameter. ε- Fe , NaCl , Li , Na and K in different pressure ranges have been employed to test the reliability of the model. The obtained results indicate that the model is reliable due to a good agreement between calculated results and the experimental data. Based on this modified model, the temperature dependence of thermal pressure for NaCl is also examined.

Prediction and Determination of Water Uptake in Packaged Yerba Mate

2004 ◽  
Vol 10 (1) ◽  
pp. 35-40 ◽  
Author(s):  
L. A. Ramallo ◽  
O. A. Albani
Keyword(s):  
Water Vapour ◽  
Water Uptake ◽  
Transmission Rate ◽  
Storage Conditions ◽  
Yerba Mate ◽  
Water Vapour Transmission Rate ◽  
Experimental Values ◽  
Temperature Water ◽  
Good Agreement

Permeability of different packaging materials and the water uptake were studied in stored yerba mate at different conditions of humidity and temperature. Water vapour transmission rate (WVTR) was evaluated using the quasi-isostatic method. During storage at high relative humidity conditions, WVTR values were of 500 gm2/day for paper and ranged from 16 to 22 gm2/day for laminated films. Values of package permeability and data of food isotherms were used to calculate the variation of internal water vapour activity and to predict the yerba mate water uptake. The predicted and experimental values were in good agreement. For similar high humidity storage conditions, yerba mate packaged with paper reached critical humidity content (9.5% d.b.) at the second day of storage whereas for the laminate films the humidity content stood below the critical value until a month of exposure.

scholarly journals Raman wavenumbers calculated as a function of pressure from the mode Grüneisen parameter of PZT (x=0.48) ceramic close to the monoclinic-cubic transition

2019 ◽  
Vol 09 (05) ◽  
pp. 1950039
Author(s):  
A. Kiraci
Keyword(s):  
Pressure Dependence ◽  
Thermodynamic Quantities ◽  
Grüneisen Parameter ◽  
Volume Data ◽  
Expansion Formula ◽  
Gruneisen Parameter ◽  
Raman Modes ◽  
Isothermal Mode ◽  
Perovskite Type ◽  
Good Agreement

The isothermal mode Grüneisen parameter [Formula: see text] of some Raman modes in [Formula: see text]TixO3 (PZT, [Formula: see text]) were calculated as a function of pressure by means of the observed pressure-dependent volume data of PZT ([Formula: see text]) crystal from the literature at room temperature of 298[Formula: see text]K. Those calculated values of [Formula: see text] were then used to compute the pressure dependence of the Raman modes in PZT ([Formula: see text]) ceramic studied here. The observed and calculated values of the Raman wavenumbers in PZT were in good agreement, which indicates that the isothermal mode Grüneisen parameter can also be used to predict the pressure-dependent wavenumbers of some other perovskite-type crystals. Additionally, the pressure dependence of the thermodynamic quantities such as isothermal compressibility [Formula: see text], thermal expansion [Formula: see text] and the specific heat [Formula: see text] of PZT ([Formula: see text]) ceramic were predicted at constant temperature of 298[Formula: see text]K. Here, the experimentally measurable thermodynamic quantities calculated for PZT ([Formula: see text]) ceramics provide theoretically a significant opportunity for testing.

VLE Determination of Carbon Dioxide Loaded Aqueous Alkanolamine Mixtures Using Modified Kent Eisenberg Model

2017 ◽  
Vol 231 (11-12) ◽  
Author(s):  
Humbul Suleman ◽  
Abdulhalim Shah Maulud ◽  
Zakaria Man
Keyword(s):  
Experimental Data ◽  
Carbon Dioxide ◽  
Model Parameters ◽  
Thermodynamic Models ◽  
Carbon Dioxide Absorption ◽  
Proposed Model ◽  
Wide Range ◽  
Experimental Values ◽  
Good Agreement

AbstractA computationally simple thermodynamic framework has been presented to correlate the vapour-liquid equilibria of carbon dioxide absorption in five representative types of alkanolamine mixtures. The proposed model is an extension of modified Kent Eisenberg model for the carbon dioxide loaded aqueous alkanolamine mixtures. The model parameters are regressed on a large experimental data pool of carbon dioxide solubility in aqueous alkanolamine mixtures. The model is applicable to a wide range of temperature (298–393 K), pressure (0.1–6000 kPa) and alkanolamine concentration (0.3–5 M). The correlated results are compared to the experimental values and found to be in good agreement with the average deviations ranging between 6% and 20%. The model results are comparable to other thermodynamic models.

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