Research Article Open Access

Numerical Study of Natural Convection in a Square Porous Cavity Thermally Modulated on Both Side Walls

Giovani E.B. Malomar1, Abdoulaye Gueye1, Cheikh Mbow1, Vieux B. Traore1 and Aboubaker C. Beye1
  • 1 University Cheikh Anta Diop, Senegal
American Journal of Engineering and Applied Sciences
Volume 9 No. 3, 2016, 591-598

DOI: https://doi.org/10.3844/ajeassp.2016.591.598

Submitted On: 30 June 2016 Published On: 13 August 2016

How to Cite: Malomar, G. E., Gueye, A., Mbow, C., Traore, V. B. & Beye, A. C. (2016). Numerical Study of Natural Convection in a Square Porous Cavity Thermally Modulated on Both Side Walls. American Journal of Engineering and Applied Sciences, 9(3), 591-598. https://doi.org/10.3844/ajeassp.2016.591.598

Abstract

The numerical study of natural convection in a square porous cavity saturated by a Newtonian fluid is presented in this study. The vertical walls are subjected to temperatures varying sinusoidally in time and phase opposition while the upper and lower horizontal walls are thermally adiabatic. Darcy model is used, it is also assumed the fluid studied is incompressible and obeys the Boussinesq approximation. The focus is on the effect of the modulation frequency (10 ≤ ω ≤ 100) and the Rayleigh number (10 ≤ Ra ≤ 1000) on the structure of the flow and transfer thermal. The results show that the extremal stream functions (ψmax and ψmin), the average Nusselt number at the hot (Tc) and cold (Tf) walls respectively Nucmoy and Nufmoy are periodic and periods equal to that excitatory temperatures to the range of parameters considered in this study. The results show also that oscillatory heating causes the appearance of secondary flow, whose amplification depends on the frequency of modulation of the imposed temperature. The results are shown in terms of streamlines and isotherms during a flow cycle.

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Keywords

  • Natural Convection
  • Sinusoidal Temperature
  • Porous Media
  • Numerical Study