Convergence angle and dimple shape effects on the heat transfer characteristics in a rotating dimple-pin fin wedge duct

Lei Luo, Han Yan, Shaoyun Yang, Wei Du, Songtao Wang, Bengt Sunden, Xinghong Zhang

Research output: Contribution to journalArticlepeer-review

9 Citations (SciVal)

Abstract

A numerical method is employed to study effects of convergence angle and dimple shape on flow structure and heat transfer under a rotating frame. The investigated convergence angles are 0.0°, 6.3°, and 12.7°. The dimple shapes are circular, streamwise-elliptical, and spanwise-elliptical. The rotation number ranges from 0.0 to 0.4. Computed flow structures and heat transfer are compared. Higher rotation number generates better heat transfer in the dimple-pin wedge duct. The rotation direction also affects the flow structure and heat transfer. The spanwise-elliptical dimple shape shows best heat transfer augmentation as it generates the strongest vortex structure and turbulent kinetic energy in the dimples. Larger convergence angles exhibit larger Nusselt numbers and better heat transfer enhancement. Effects of the Coriolis force are considered as this force has favorable effects on enhancing the heat transfer on the surface it acts on.

Original languageEnglish
Pages (from-to)1611-1635
Number of pages25
JournalNumerical Heat Transfer; Part A: Applications
Volume74
Issue number10
DOIs
Publication statusPublished - 2019 Feb 4

Subject classification (UKÄ)

  • Energy Engineering

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