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A synthetic jet impingement is a potential method for removing heat but currently has some specific challenges. One of the challenges is the low value of heat transfer compared to the steady jet impingement in confined spaces. The reason behind the lower performance is the recirculation of hot air from the heated surface. There is a need to change the flow structure to limit hot air recirculation. Therefore, the effect of rib location and size on heat transfer has been studied numerically. A numerical investigation on ribs (ring fins) has been carried out using square fins having height and width of 5 mm × 5 mm, 2 mm × 2 mm, and 1 mm × 1 mm at different nondimensional radial locations of r/d = 2, r/d = 1, and r/d = 0.5. An acoustically actuated synthetic jet is operated at 125 Hz with an orifice exit of 10 mm corresponding to Reynolds number 5473. It is found that adding a ring fin improves heat transfer at specific radial locations far from the stagnation point. Still, overall reduction has been observed due to confinement and backflow effects.

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Effect of the Rib Size and Location on Heat Transfer Performance of the Synthetic Jet: A Numerical Study

  • 会议论文

  • 发表日期：

    2025年

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  • Zen Kapadiya,
  • Dnyanesh Mirikar,
  • Rajat Kumar,
  • Harekrishna Yadav

摘要

A synthetic jet impingement is a potential method for removing heat but currently has some specific challenges. One of the challenges is the low value of heat transfer compared to the steady jet impingement in confined spaces. The reason behind the lower performance is the recirculation of hot air from the heated surface. There is a need to change the flow structure to limit hot air recirculation. Therefore, the effect of rib location and size on heat transfer has been studied numerically. A numerical investigation on ribs (ring fins) has been carried out using square fins having height and width of 5 mm × 5 mm, 2 mm × 2 mm, and 1 mm × 1 mm at different nondimensional radial locations of r/d = 2, r/d = 1, and r/d = 0.5. An acoustically actuated synthetic jet is operated at 125 Hz with an orifice exit of 10 mm corresponding to Reynolds number 5473. It is found that adding a ring fin improves heat transfer at specific radial locations far from the stagnation point. Still, overall reduction has been observed due to confinement and backflow effects.