Correlation Between the Structural Parameters and the Thermal Conductivity of Chalcopyrite-Type Ternary Compounds

1985 ◽  
pp. 127-137 ◽  
Author(s):  
P. Kistaiah ◽  
K. Satyanarayana Murthy ◽  
Leela Iyengar
Keyword(s):  
Thermal Conductivity ◽  
Structural Parameters ◽  
Ternary Compounds

scholarly journals X-ray diffraction study of structure of CaO-Al2O3-SiO2 ternary compounds in molten and crystalline states

2020 ◽  
Vol 56 (2) ◽  
pp. 269-277
Author(s):  
V.E. Sokol’skii ◽  
D.V. Pruttskov ◽  
O.M. Yakovenko ◽  
V.P. Kazimirov ◽  
O.S. Roik ◽  
...  
Keyword(s):  
Short Range ◽  
Room Temperature ◽  
Short Range Order ◽  
Structural Parameters ◽  
Range Order ◽  
Reverse Monte Carlo ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Ternary Compounds

Anorthite and gehlenite crystalline structure and short-range order of anorthite melt have been studied by X-ray diffraction in the temperature range from room temperature up to ~ 1923 K. The corresponding anorthite and gehlenite phases were identified as well as amorphous component for anorthite samples having identical shape to XRD pattern of the anorthite melt. The structure factor and the radial distribution function of atoms of the anorthite melt were calculated from the X-ray high-temperature experimental data. The partial structural parameters of the short-range order of the melt were reconstructed using Reverse Monte Carlo simulations.

Control of structural parameters and thermal conductivity of BeO ceramics using heavy ion irradiation and post-radiation annealing

2019 ◽  
Vol 45 (12) ◽  
pp. 15412-15416 ◽  
Author(s):  
A.V. Trukhanov ◽  
A.L. Kozlovskiy ◽  
A.E. Ryskulov ◽  
V.V. Uglov ◽  
S.B. Kislitsin ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Ion Irradiation ◽  
Structural Parameters ◽  
Heavy Ion ◽  
Heavy Ion Irradiation ◽  
Radiation Annealing ◽  
Post Radiation

scholarly journals Pressure Effect of the Vibrational and Thermodynamic Properties of Chalcopyrite-Type Compound AgGaS2: A First-Principles Investigation

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2370 ◽  
Author(s):  
Jianhui Yang ◽  
Qiang Fan ◽  
You Yu ◽  
Weibin Zhang
Keyword(s):  
Thermal Conductivity ◽  
Thermodynamic Properties ◽  
First Principles ◽  
Structural Parameters ◽  
Structural Phase ◽  
First Principles Calculation ◽  
Optical Phonons ◽  
Phonon Modes ◽  
Type Compound ◽  
Center Point

To explore the structural, vibrational, and thermodynamic properties of the chalcopyrite-type compound AgGaS2 under pressure, we applied hydrostatic pressure to the relaxed compound based on the first principles calculation and quasi-harmonic approximation. The structural parameters, including lattice constants and bond lengths decrease monotonically with the increasing pressure. The phonon dispersion curves under various pressures reveal the structural phase transition of chalcopyrite-type compound AgGaS2 at about 4 GPa. The intrinsic mechanism of thermal conductivity for the chalcopyrite-type compound AgGaS2 has been shown with phonon anharmonicity. The frequencies of the optical phonons at the center point Γ of the first Brillouin zone were calculated with the longitudinal optical–transverse optical (LO–TO) splitting mode. The dependence of the frequencies of the optical phonons on the pressure provides the information for the Raman spectroscopic study under high pressure. The pressure dependence of the Grüneisen parameters indicates that the instability of chalcopyrite-type compound AgGaS2 is associated with the softening of the acoustic phonon modes at around the center point Γ. The thermal conductivity for chalcopyrite-type compound AgGaS2 could be reduced by applying external pressure. The various thermodynamic properties, such as the Helmholtz free energy, entropy, and heat capacity, at different temperatures and pressures were discussed and analyzed based on the phonon properties.

scholarly journals Thermal Conductivity of the Ternary Compounds: AgMTe2 and AgM5Te8 (M = Ga or In)

2009 ◽  
Vol 50 (7) ◽  
pp. 1603-1606 ◽  
Author(s):  
Anek Charoenphakdee ◽  
Ken Kurosaki ◽  
Hiroaki Muta ◽  
Masayoshi Uno ◽  
Shinsuke Yamanaka
Keyword(s):  
Thermal Conductivity ◽  
Ternary Compounds

Thermal conductivity of ternary Compounds

1979 ◽  
Vol 51 (1) ◽  
pp. K35-K40 ◽  
Author(s):  
S. M. Wasim
Keyword(s):  
Thermal Conductivity ◽  
Ternary Compounds

Modeling and simulation of twin-tube hydraulic shock absorber thermodynamic characteristics and sensitivity analysis of its influencing factors

2020 ◽  
Vol 11 (02) ◽  
pp. 2050012
Author(s):  
Yuewei Yu ◽  
Leilei Zhao ◽  
Changcheng Zhou ◽  
Lin Yang
Keyword(s):  
Thermal Conductivity ◽  
Temperature Rise ◽  
Shock Absorber ◽  
Structural Parameters ◽  
Thermodynamic Characteristics ◽  
Outer Wall ◽  
Hydraulic Shock ◽  
External Work ◽  
Oil Storage ◽  
Hydraulic Shock Absorber

In order to find out the sensitivity of the thermophysical and structural parameters to the thermodynamic characteristics of twin-tube hydraulic shock absorbers, based on the bench test, a method for calculating the time-varying rate of the external work on the shock absorber oil is proposed. And then, a thermodynamic model of the twin-tube hydraulic shock absorber is established by using the basic thermodynamic principles. By analyzing the influence of each parameter on the thermodynamic characteristics of the shock absorber, it can be seen that, the radius of the working cylinder outer wall has the greatest influence on the temperature rise of the shock absorber, followed by the thermal conductivity of the oil, the height of the oil, the heat transfer length of the cylinder barrel, the radius of the oil storage cylinder outer wall, the emissivity of the oil storage cylinder outer wall, the height of the nitrogen, the thermal conductivity of the nitrogen, the specific heat capacity of the oil, the density of the oil, the thermal conductivity of the cylinder, and the mass of the working oil. The kinematic viscosity of the oil has the least influence on the temperature rise of the shock absorber. The research can provide an effective theoretical guidance and reference for the design of the twin-tube hydraulic shock absorber.

scholarly journals Theoretical and Experimental Studies on Thermal Properties of Polyester Nonwoven Fibrous Material

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2882 ◽  
Author(s):  
Tao Yang ◽  
Xiaoman Xiong ◽  
Michal Petrů ◽  
Xiaodong Tan ◽  
Hiroki Kaneko ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Property ◽  
Fiber Orientation ◽  
Fibrous Material ◽  
Structural Parameters ◽  
Experimental Studies ◽  
Relative Difference ◽  
Modified Model ◽  
Nonwoven Materials ◽  
Relative Differences

Polyester nonwoven fibrous material is widely used in construction and automobile industries for thermal insulation purposes. It is worthy and meaningful to understand the effect of structural parameters on the thermal property. Fiber orientation, as one of the most vital parameters, has a significant effect on thermal property. However, there has been little quantitative analysis focusing on this aspect. This paper theoretically and experimentally analyzes the thermal conductivity of samples with varying fiber orientation. Existing models were selected to predict the thermal conductivity of polyester nonwoven samples. Two different apparatus were applied to carry out the experimental measurements. The relative differences between the predicted and measured results were compared. One commonly used model was modified for accurate prediction. It was shown that some existing models under- or overestimate the thermal conductivity compared to the measured values. The results indicate that the modified model can accurately predict the thermal conductivity of polyester nonwoven materials within a 0.2% relative difference.

EFFECTIVE THERMAL CONDUCTIVITY OF POROUS MEDIA WITH ROUGHENED SURFACES BY FRACTAL-MONTE CARLO SIMULATIONS

Fractals ◽  
2020 ◽  
Vol 28 (02) ◽  
pp. 2050029 ◽  
Author(s):  
BOQI XIAO ◽  
SHUAI WANG ◽  
YAN WANG ◽  
GUOPING JIANG ◽  
YIDAN ZHANG ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Porous Media ◽  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Effective Thermal Conductivity ◽  
Structural Parameters ◽  
Monte Carlo Model ◽  
Maximum Diameter ◽  
Empirical Constant ◽  
Relative Roughness

In this paper, the Fractal-Monte Carlo has been employed to simulate the effective thermal conductivity of porous media with roughened surfaces. The proposed probability model for the effective thermal conductivity of porous media with roughened surfaces can be expressed as a function of the relative roughness, porosity, minimum and maximum diameter of pores, fractal dimensions, and random number. The proposed model is validated by a satisfying agreement of our Fractal-Monte Carlo simulations and the experimental data. In our Fractal-Monte Carlo model, there is no extra empirical constant and each parameter has clear physical meaning. Then, the effects of micro-structural parameters of porous media on the effective thermal conductivity of porous media with roughened surfaces have been analyzed in detail. It can be found that the effective thermal conductivity of porous media with roughened surfaces decreases with the increase of relative roughness and tortuosity fractal dimension. Our results demonstrate that the proposed Fractal-Monte Carlo model can be used to characterize other transport properties such as mass transfer of porous media.

The effect of weave pattern on the thermal properties of woven fabrics

2018 ◽  
Vol 30 (4) ◽  
pp. 525-535 ◽  
Author(s):  
Azita Asayesh ◽  
Mehraneh Talaei ◽  
Mohammad Maroufi
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Thermal Resistance ◽  
Design Methodology ◽  
Structural Parameters ◽  
Thermal Characteristics ◽  
Woven Fabrics ◽  
Content Type ◽  
Weave Fabric ◽  
Weave Pattern

Purpose Fabric structural parameters play an important role on the thermal comfort of clothing. The purpose of this paper is to investigate the effect of weave pattern and also the length of warp float in each weave pattern on the thermal properties of woven fabrics. Design/methodology/approach Cotton woven fabrics with 23 different weave patterns were produced with identical linear densities of warp and weft yarns as well as constant warp and weft nominal densities. Thereafter, their thermal properties were studied. Findings Statistical analysis demonstrated that the weave pattern significantly influences on the thermal properties of woven fabrics. Plain fabric exhibited the lowest thermal resistance and the highest thermal conductivity, and hopsack 2/2(4) weave fabric demonstrated the highest thermal resistance and the lowest thermal conductivity. Moreover, except hopsack (4) weave fabric, in all weave patterns, the length of warp float had a significant effect on the thermal characteristics of the fabrics, as increasing the warp float led to increase in the thermal resistance of the fabrics. Originality/value Weave pattern as one of the structural parameters of the fabric has a determinant role on the thermal properties of fabric and subsequently, the comfort of clothing produced from it. Owing to the lack of investigation in this area, this research considers the effect of weave pattern and the length of warp float in each weave pattern on the thermal properties of woven fabrics.

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