Effect of vortex promoter shape on heat transfer in MHD duct flow with axial magnetic field

Wisam K. Hussam, Ahmad H. A. Hamid, Zhi Y. Ng, Gregory J. Sheard

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)


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≤Ha≤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 Ha=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.

Original languageEnglish
Pages (from-to)453-464
Number of pages12
JournalInternational Journal of Thermal Sciences
Publication statusPublished - 1 Dec 2018


  • Channel flow
  • Heat transfer
  • Magnetohydrodynamics
  • Quasi-two-dimensional model
  • Triangular cylinder

Cite this