CONVECTIVE INSTABILITY IN A HORIZONTAL POROUS LAYER SATURATED WITH A CHEMICALLY REACTING FLUID

Citation
Ms. Malashetty et al., CONVECTIVE INSTABILITY IN A HORIZONTAL POROUS LAYER SATURATED WITH A CHEMICALLY REACTING FLUID, International journal of heat and mass transfer, 37(18), 1994, pp. 2901-2908
Citations number
13
Categorie Soggetti
Mechanics,"Engineering, Mechanical",Thermodynamics
ISSN journal
00179310
Volume
37
Issue
18
Year of publication
1994
Pages
2901 - 2908
Database
ISI
SICI code
0017-9310(1994)37:18<2901:CIIAHP>2.0.ZU;2-T
Abstract
A linear stability analysis has been performed to study the onset of c onvective instability in a horizontal inert porous layer saturated wit h a fluid undergoing zero-order exothermic chemical reactions. The hor izontal porous layer is cooled from the upper boundary while two diffe rent thermal boundary conditions are imposed at the lower boundary, i. e. an isothermal wall and an adiabatic wall. The resulting eigenvalue problems were solved approximately using a single-term Galerkin method that gives the critical Rayleigh number and the associate wave number at a given Frank-Kamenetskii number. It is found that, with chemical reactions, the fluid in the porous medium is more prone to instability as compared to the case in which chemical reactions are absent.