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Journal of Porous Media
IF: 1.49 5-Year IF: 1.159 SJR: 0.43 SNIP: 0.671 CiteScore™: 1.58

ISSN Print: 1091-028X
ISSN Online: 1934-0508

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Journal of Porous Media

DOI: 10.1615/JPorMedia.v17.i5.60
pages 439-455

CONVECTION IN MAGNETIC NANOFLUIDS IN POROUS MEDIA

Amit Mahajan
Department of Applied Sciences, NIT Delhi, Narela-110040, India
Mahesh Kumar Sharma
Department of Mathematics, Central University of Himachal Pradesh, Dharamshala, H. P. 176 215, India

ABSTRACT

Convective instability in a thin layer of low permeability of a magnetic nanofluid is examined. The model used incorporates the effect of Brownian diffusion, thermophoresis, and magnetophoresis. The eigenvalue problem is solved by employing the Chebyshev pseudospectral method and the results are discussed for various combinations of boundary conditions on impermeable, free, conducting, and with constant heat flux surfaces for water- and ester-based magnetic nanofluids. The effect of magnetic field, permeability, and modified particle density increment has been analyzed at the onset of convection. In the microgravity environment, the magnetic nanofluid is more resilient to convection and, in general, for all boundary conditions requires a higher temperature gradient for the threshold of convection.


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