Destabilising A Fluid Saturated Gravity Modulated Porous Layer Heated From Above

Author: S Govender

Source: Transport in Porous Media, Volume 59, Number 2, May 2005 , pp. 215-225(11)

Publisher: Springer

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Abstract:

The linear stability theory is used to investigate analytically the possibility of the motionless basic state in a porous layer heated from above and subjected to vibration. The linear stability results presented for the specific case of low amplitude vibration shows that there exists a bandwidth of frequencies for which the convection in a porous layer with a stable density gradient can be destabilized. In addition the scaled Darcy–Prandtl number is shown to influence the onset of the subharmonic and synchronous solutions.

Keywords: gravity modulation; porous media; free convection; stability; Darcy–Prandtl number

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s11242-004-1490-7

Affiliations: 1: School of Mechanical Engineering, University of Kwa-Zulu Natal, 4041, Durban, South Africa, Email: govender65@nu.ac.za

Publication date: 2005-05-01