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Heat Transfer Research

年間 18 号発行

ISSN 印刷: 1064-2285

ISSN オンライン: 2162-6561

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Indexed in

NUMERICAL INVESTIGATION OF MIXED CONVECTION OF NON-NEWTONIAN FERROFLUIDS IN A CONCENTRIC ANNULUS: COMBINED FHD-MHD EFFECTS

巻 51, 発行 8, 2020, pp. 459-779
DOI: 10.1615/HeatTransRes.2020032779
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要約

Mixed convection of non-Newtonian ferrofluid inside a concentric horizontal annulus is studied numerically under the influence of a nonuniform magnetic field. In the present study, the effects of ferrohydrodynamics (FHD) and magnetohydrodynamics (MHD) are taken into account simultaneously. It is assumed that the non-Newtonian fluid obeys the power-law model. Furthermore, the inner cylinder is considered to be rotating in order to create the forced convection effects. The effect of various parameters, namely, the Richardson number (0.1-10), power-law index (0.8-1.2), magnetic number arising due to the FHD principles (0-5), and the Hartmann number as a result of MHD effects (0-5) on the mixed convection performance have been examined. The results reveal that an increase of the Richardson number causes an increase in the average Nusselt number for the pseudoplastic and Newtonian fluids, while this trend is nearly negligible for a dilatant fluid. In addition, regardless of the value of all considered parameters, it is observed that the average Nusselt number is a decreasing function of the power-law index. Considering the FHD effects, it is noticed that for pseudoplastic fluid the Nusselt number increases as the magnetic number is enhanced but the opposite manner occurs for a dilatant fluid. Also, application of magnetic field causes both enhancement and deterioration effects on the heat transfer of Newtonian ferrofluids depending on the Richardson number. Under MHD conditions, an increasing Hartmann number results in a decreasing Nusselt number for a pseudoplastic fluid, whereas this effect is not considerable for Newtonian and dilatant ferrofluids.

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