Thermoconvective instabilities in supercritical fluids

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• 作者：Amiroudine ; Sakir ; Zappoli ; Bernard
• 关键词：Supercritical fluid ; Piston effect ; Instability ; Finite volume ; Fluide supercritique ; Effet piston ; Instabilit&eacute
• 刊名：Comptes Rendus Mecanique
• 出版年：2004
• 期刊代码：116_16310721
• 类别：ms
• 出版时间：May - June, 2004
• 卷：332
• 期：5-6
• 页码：345-351
• 文件大小：211 K

摘要

A numerical solution of the Navier–Stokes equations coupled with the energy and linearised equation of state has been performed in the unsteady Rayleigh–Bénard configuration for nearly supercritical ³He in the exact conditions with which Meyer and Kogan (Phys. Rev. E 63 (2002) 056310) performed their experiments. We propose an interpretation of the observed unexpected temperature oscillations at the convection onset in terms of coupled hot and cold piston effects. We have also considered the stability of two layers (hot and cold) of a same supercritical fluid in an unstable configuration. The first results show an analogy between the diffusion of species (Rayleigh–Taylor like instability) and thermal diffusion considered in this study. To cite this article: S. Amiroudine, B. Zappoli, C. R. Mecanique 332 (2004).