Heat transfer enhancement in quasi-two-dimensional magnetohydrodynamic duct flows using repeated flow-facing wedge-shaped protrusions

Sneha Murali, Wisam K. Hussam, Gregory J. Sheard

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

Repeated flow-facing wedge-shaped protrusions are explored as a means to enhance the heat transfer behaviour in a quasi-two-dimensional magnetohydrodynamic duct flow. Quasi-two-dimensionality is achieved under a strong magnetic field which are prevalent in the cooling blankets of fusion reactors. Ranges of Hartmann friction parameters (50 ≤ H ≤ 500) and Reynolds numbers (1300 ≤ Re ≤ 3000) are investigated. The effect of blockage β (wedge height to duct height), pitch γ (distance between wedges) and wedge angle ϕ on heat transfer ratio HR and efficiency η are considered. A monotonic increase in HR with β is observed in the range of β investigated. It is possible to further improve HR by changing the geometric parameter to an optimal pitch and optimal wedge angle. Corresponding to each H there exists an optimal β, γ and ϕ where maximum η could be achieved. In contrast to the optimal β which showed a monotonic increase with H, optimal γ and ϕ showed a reversal in the trend after a critical H. Effectiveness of surface modification on the heated wall is also established through a net power analysis.

Original languageEnglish
Article number121066
JournalInternational Journal of Heat and Mass Transfer
Volume171
DOIs
Publication statusPublished - Jun 2021

Keywords

  • Heat transfer enhancement
  • Quasi-two-dimensional MHD duct flows
  • Surface modification

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