Abstract
•We studied double-diffusive natural convection over circular cylinders in a non-Darcy porous enclosure with nanofluids using the finite volume method.•The nanofluids on the outer enclosure walls and inner cylinders are passively controlled.•We investigated the effects of the circular cylinders locations and sizes on the fluid characteristics.•The effects of current physical parameters in heat and mass transfer and fluid flow have been studied with graphical illustrations.
In this study, we solved numerically the double-diffusive natural convection over circular cylinders in a non-Darcy porous enclosure filled with nanofluids using a simple algorithm in a finite volume method. Here, the inner circular cylinders are maintained at a hot temperature Th, and concentration Ch. The enclosure vertical side walls are maintained at a cool temperature Tc, and concentration Cc, and the horizontal walls are assumed to be adiabatic. The nanofluids on the outer enclosure walls and inner cylinders are passively controlled. We investigated the effects of the circular cylinders locations and sizes on the heat and mass transfer and fluid flow. The effects of Rayleigh number, Darcy parameter, Soret number with modified Dufour number and nanoparticles parameters in heat and mass transfer and fluid flow have been studied with graphical illustrations. It is found that, the size and formation of cells inside the enclosure strongly depend on the Rayleigh number with Darcy parameter, and sizes and locations of the inner circular cylinders. The current numerical results are well validated with a reasonable agreement.
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