Influence of vertical vibrations on the separation of a binary mixture in a horizontal porous layer heated from below

• Published in: International journal of heat and mass transfer Vol. 52; no. 1; pp. 165 - 172
• Main Authors: Elhajjar, Bilal, Mojtabi, Abdelkader, Charrier-Mojtabi, Marie-Catherine
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 15.01.2009; Elsevier
• Subjects: Applied sciences; Binary mixture; Chemical engineering; Crystallization, leaching, miscellaneous separations; Engineering Sciences; Exact sciences and technology; Fluids mechanics; Linear stability; Mechanics; Porous media; Soret effect; Thermo vibration; Thermogravitation; Porous media; Soret effect; Binary mixture; Linear stability; Thermogravitation; Thermo vibration; Thermohaline convection; Horizontal layer; Boundary condition; Modeling; Porous medium flow; Vibration effect; Separation process; Numerical simulation; Heat transfer; Double diffusion
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/j.ijheatmasstransfer.2008.05.033

We study the influence of vertical high-frequency and small-amplitude vibrations on the separation of a binary mixture saturating a shallow horizontal porous layer heated from below. The monocellular flow obtained for a separation ratio ψ > ψ mono > 0 leads to a migration of the species towards the two vertical boundaries of the cell. The 2D direct numerical simulations and the linear stability analysis of the averaged governing equations show that the vertical vibrations delay the transition from monocellular flow to multicellular flow. The vibrations also decrease the value of ψ mono, which allows species separation for a wide variety of binary mixtures.