Isotope Effects on Molar Volume and Surface Tension: Simple Theoretical Model and Experimental Data for Hydrocarbons

On the basis of the thermal equation-of-state a simple theoretical model is developed to study the pressure dependence of melting temperature. The model is then applied to compute the high pressure melting curve of 10 metals (Cu, Mg, Pb, Al, In, Cd, Zn, Au, Ag and Mn). It is found that the melting temperature is not linear with pressure and the slope [Formula: see text] of the melting curve decreases continuously with the increase in pressure. The results obtained with the present model are also compared with the previous theoretical and experimental data. A good agreement between theoretical and experimental result supports the validity of the present model.

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Porosity and Effective Thermal Conductivity of Wire Screens

Journal of Heat Transfer ◽

10.1115/1.2910365 ◽

1990 ◽

Vol 112 (1) ◽

pp. 5-9 ◽

Cited By ~ 53

Author(s):

Won Soon Chang

Keyword(s):

Experimental Data ◽

Thermal Conductivity ◽

Theoretical Model ◽

Effective Thermal Conductivity ◽

Present Model ◽

Model Based ◽

Wire Screen ◽

Simple Theoretical Model ◽

Parallel Conduction ◽

The Wire

A simple theoretical model based on combined series and parallel conduction for the effective thermal conductivity of fluid-saturated screens has been developed. The present model has been compared with the existing correlations and experimental data available in literature, and it has been found that the model is effective in predicting thermal conductivity. The study also demonstrates that it is important to include the actual thickness of the wire screen in order to calculate the porosity accurately.

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Notizen: Triplet Quenching by Oxygen in a Rhodamine 6G Laser

Zeitschrift für Naturforschung A ◽

10.1515/zna-1973-0542 ◽

1973 ◽

Vol 28 (5) ◽

pp. 792-793 ◽

Cited By ~ 1

Author(s):

F. P. Schäfer ◽

L. Ringwelski

Keyword(s):

Experimental Data ◽

Theoretical Model ◽

Output Power ◽

Room Temperature ◽

Rhodamine 6G ◽

Laser Output Power ◽

Simple Theoretical Model ◽

Best Fit ◽

Triplet Lifetime ◽

Quenching By Oxygen

Measurements of dye laser output power vs. oxygen content of the dye solution are reported and compared with a simple theoretical model. The triplet lifetime of rhodamine 6G in oxygen-free methanol at room temperature is seen to lie between 1 and 100 μsec, with 2 μsec giving the best fit of the experimental data.

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Size and shape dependence of Debye temperature and Raman frequency of nanomaterials

Modern Physics Letters B ◽

10.1142/s0217984915500049 ◽

2015 ◽

Vol 29 (04) ◽

pp. 1550004

Author(s):

Raghuvesh Kumar ◽

Sandhya Bhatt ◽

Munish Kumar

Keyword(s):

Experimental Data ◽

Theoretical Model ◽

Debye Temperature ◽

Experimental Studies ◽

Raman Frequency ◽

Size And Shape ◽

Shape Dependence ◽

Simple Theoretical Model ◽

Good Agreement

A simple theoretical model is developed to study the size and shape dependence of Debye temperature and Raman frequency of nanomaterial. We have studied the effect of size and shape on Debye temperature of nanocrystalline Fe , Co , Al and Ag . The model is extended to study the effect of size and shape on the Raman frequency of nanocrystalline SnO 2, CeO 2 and CdSe . The results obtained are compared with the available experimental data. A good agreement between the theory and experimental data supports the validity of the model developed. We also report the results for nanowire and nanofilm in the absence of experimental data, which may help the researchers engaged in the experimental studies.

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High-Pressure Elastic Constant of Some Materials of Earth’s Mantle

Zeitschrift für Naturforschung A ◽

10.1515/zna-2015-0487 ◽

2016 ◽

Vol 71 (5) ◽

pp. 433-437

Author(s):

Quan Liu

Keyword(s):

Experimental Data ◽

High Pressure ◽

Theoretical Model ◽

Elastic Behaviour ◽

Exponential Relationship ◽

Earth’S Mantle ◽

Simple Theoretical Model ◽

Volume Dependence ◽

Theoretical Investigations ◽

Good Agreement

AbstractIn the present work, an exponential relationship for the volume dependence of the Anderson–Grüneisen parameter along isotherm and the formulation derived from Tallon’s model have been used to develop a simple theoretical model for the elastic constants as a function of pressure. Applying it to some materials of earth’s mantle at different pressure ranges, the calculated results are in good agreement with the earlier theoretical investigations and available experimental data and thus show that our theory can be applied for predicting the elastic behaviour of earth materials at high pressure.

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Simulation of the Discharging Process Throughout a Porous Medium Initially Saturated With Fluid

Fluids Engineering ◽

10.1115/imece2003-42857 ◽

2003 ◽

Author(s):

G. J. Carbajal ◽

J. E. Gonza´lez ◽

R. Diaz

Keyword(s):

Experimental Data ◽

Surface Tension ◽

Porous Medium ◽

Theoretical Model ◽

Pressure Drop ◽

Simulation Analysis ◽

Data Sets ◽

Model And Simulation ◽

Linear Behavior ◽

Numerical Formulation

This paper presents the development of a theoretical model and simulation analysis for the discharging process that takes place in a porous medium initially saturated with ink. During the discharging process the porous material provides enough surface area to hold the fluid by capillarity effects. It was found by the numerical solution that the velocity profile through the porous region was uniform and the backpressure had a linear behavior as function of time. A parametric study also revealed that the permeability, void volume and surface tension have a significant effect on the pressure drop. The numerical formulation was validated with experimental data and good agreements were found between both data sets.

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Influence of Zinc on the Surface Tension, Density and Molar Volume of (Ag-Sn)eut +Zn Liquid Alloys

Archives of Metallurgy and Materials ◽

10.1515/amm-2016-0067 ◽

2016 ◽

Vol 61 (1) ◽

pp. 361-368 ◽

Cited By ~ 2

Author(s):

W. Gąsior ◽

J. Pstruś ◽

Z. Moser

Keyword(s):

Experimental Data ◽

Surface Tension ◽

Molar Volume ◽

Zinc Concentration ◽

Straight Line ◽

Gas Atmosphere ◽

Zinc Addition ◽

Protective Gas ◽

Lead Free Solders ◽

Butler’S Equation

The dilatometric and maximum bubble pressure methods were applied for the measurements of the density and surface tension of liquid (Ag-Sn)eut+Zn lead-free solders. The experiments were carried out in the temperature range from 515 to 1223 K for the alloys of the zinc concentration equaling 0.01, 0.02, 0.04, 0.05, 0.1 and 0.2 of the mole fraction. It was found that the temperature dependence of both the density and the surface tension could be thought as linear, so they were interpreted by straight line equations. The experimental data of the molar volume of the investigated alloys were described by the polynomial dependent on the composition and temperature.Calculations of the surface tension by Butler’s equation were conducted and confronted with the experimental data. Some significant deviations between the experimental and the calculated surface tension were observed. They reached almost 40 mNm-1. The observed changes of the density and surface tension caused by the zinc addition to the Ag-Sn eutectic were discussed with the consideration of the thermodynamic properties and the influence of a small quantity of impurities in a protective gas atmosphere.

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Progressive Matrix Cracking in Composite Laminates Loaded in Tension

Advanced Composites Letters ◽

10.1177/096369359200100103 ◽

1992 ◽

Vol 1 (1) ◽

pp. 096369359200100 ◽

Cited By ~ 2

Author(s):

J Zhang ◽

J Fan ◽

C Soutis

Keyword(s):

Experimental Data ◽

Theoretical Model ◽

Crack Initiation ◽

Composite Laminates ◽

Matrix Cracking ◽

Shear Lag ◽

Simple Theoretical Model ◽

Stiffness Properties ◽

Progressive Matrix ◽

Good Agreement

The reduction of stiffness properties due to transverse ply cracking in [μθ m/90 n] s laminates loaded in quasi-tension is examined theoretically. Predictions of a simple theoretical model based on a modified 2-D shear-lag analysis, are in good agreement with experimental data. The energy released as a result of matrix cracking is also calculated and used to predict crack initiation and multiplication.

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