Energy transfer in a volume-structured medium
| Autor: | Yu F Kir'yanov, Sergey G Garanin, Gennadi A. Kirillov, S V Bondarenko, Gennady G. Kochemasov |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
business.industry Statistical and Nonlinear Physics Mechanics Radiation Microstructure Electromagnetic radiation Atomic and Molecular Physics and Optics Isothermal process Hydrothermal circulation Electronic Optical and Magnetic Materials Optics Heat transfer Electrical and Electronic Engineering business Porous medium Penetration depth |
| Zdroj: | Quantum Electronics. 31:39-44 |
| ISSN: | 1468-4799 1063-7818 |
| Popis: | A study was made of the physical properties of the so-called foam — a low-density (the average density is ~1 μg cm-3) microstructured medium. Foams of different type were classified according to the specific features of their internal structure. The propagation of high-power laser radiation through these media was considered and the relationships for the depth of radiation penetration for differently structured foams were obtained. Based on a self-similar solution describing the expansion of a film (filament) with its simultaneous heating by the law T=Atα, a model of the heat propagation through a porous medium was proposed and a relationship for the hydrothermal wave velocity νht=[4K/α(α+2)]1/2cT was obtained (cT is the isothermal sound velocity in the bulk of the heated material and K is a constant determined in the context of the model). The hydrothermal wave velocity was shown to be substantially determined by the processes occurring on a foam microstructure scale. The velocity dependence on the parameters of these processes was analysed within the framework of the proposed model. |
| Databáze: | OpenAIRE |
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