Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 134, Issue -, Pages 453-464Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2018.06.012
Keywords
Magnetohydrodynamics; Channel flow; Triangular cylinder; Quasi-two-dimensional model; Heat transfer
Categories
Funding
- Australian Research Council [DP150102920]
- Malaysia Ministry of Education
- Universiti Teknologi MARA, Malaysia
- Faculty of Engineering International Postgraduate Research Scholarship (FEIPRS) from the Faculty of Engineering, Monash University
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The heat transfer from the side-wall of a duct through which an electrically conducting fluid flows within a strong transverse magnetic field is numerically investigated using high-resolution numerical simulation. Parameter ranges considered are 0 <= H alpha <= 2400 and 100 <= Re <= 3000 for a constant blockage ratio of 1/4. The gain in the heat transfer using obstacles of different geometric shapes are compared. For H alpha = 320, a maximum heat transfer enhancement of 78% is obtained when using the square cylinder at a modes Re = 1000, while the triangular cylinder outperformed the various other vortex promoter geometries at Re = 2000 yielding a 75% improvement.. However, at a higher Hartmann number of Ha = 2400, a maximum heat transfer augmentation of 16% and 40% is obtained for the triangular cylinder at Re = 1000 and 2000, respectively. This suggests that for a duct flow under the influence of a strong magnetic field, the triangular obstacle is a superior heat transfer promoter geometry compared to the square or circular cylinders. A further net power analysis reveals that the heat transfer enhancement dominates over the pumping power to produce net benefits for even a modest heat transfer enhancement.
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