Thermal expansionbulk modulusquasiharmonicanharmonicelectron–phonon"Quasi-harmonic" (QH) theory should not be considered a low-order theory of anharmonic effects in crystals, but should be recognized as an important effect separate from "true" anharmonicity. The original and widely used meaning of ...
The Grüneisen theory of thermal expansion as formulated by Born and Huang has been modified by including higher-order terms for the change in volume in the expansion of potential energy. New expressions are obtained for the thermal expansivity and bulk modulus, and used to estimate these ...
which gives a measure of the ratio between the viscous losses and the thermal losses in a system. For air, this number is 0.7, while it is around 7.1 for water. In air, the thermal and viscous effects are roughly equal in importance, while for water (and most other fluids), the therm...
aAlternate Payor 备选的付款人[translate] aIn addition, no one has yet established an analytical theory for the thermal expansion coefficient of DNA biofilm absorbed on microcantilever. 另外,没人建立了一种分析理论为在microcantilever吸收的脱氧核糖核酸biofilm热扩散系数。[translate]...
The thermal properties of δ -plutonium are studied in terms of the elementary electronic structure, and contrasted to those of aluminum. In both metals the thermal expansion can be understood as from the pressure of the gas of phonons, a negative expansion in the case of plutonium because of...
ELECTRON THEORY ON THERMAL EXPANSION OF SOLIDS AND ITS APPLICATION TO LIGHT METALSsolid thermal expansion electron theory.In first-order approximation, the interaction potential function among atoms in solidsmay be expressed aswhere gα depends on the electron structures of solids; rα and rαo ...
Crystals and glasses exhibit fundamentally different heat conduction mechanisms: the periodicity of crystals allows for the excitation of propagating vibrational waves that carry heat, as first discussed by Peierls, while in glasses the lack of periodici
The thermal expansion analysis is important in submarine pipeline design and research. A new thermal expansion analysis method of submarine pipe-in-pipe is proposed in this paper based on the shear lag theory. The axial force distribution and the thermal expansion displacement of submarine pipe-in-...
For ionic materials, it is found that both lattice and electronic contributions may be important, as are both explicit temperature variation and thermal-expansion effects. Experimental data on the temperature dependence of ωand the band gap are employed to obtain good agreement with the frequency ...
whereβis the volumetric coefficient of thermal expansion,κis the isothermal compressibility, andcpandcυare the specific heat capacity at constant pressure and constant volume, respectively. For 3D flow without internal heat source and viscous dissipation, we have demonstrated25that an unsteady energy...