Cooling performance improvement of impingement hybrid synthetic jets in a confined space with the aid of a fluid diode

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  • Wuhan University


For the conventional synthetic jet in a confined space, the recirculation of heated air at a small nozzle-to-surface spacing results in deterioration of its impingement cooling ability. To overcome this drawback, various novel fluid diodes are designed and introduced to form hybrid synthetic jets in this paper. Numerical analyses are carried out to reveal the cooling performance enhancement mechanism of the hybrid synthetic jets with the aid of fluid diodes. Instantaneous images of velocity contour and streamline at one cycle are comparatively presented to elaborate on their flow characteristics. Based on the simulation results, the volumetric efficiency, air temperature at the nozzle exit, average temperature on the heated surface and average Nusselt number are further calculated to quantify the improvements of the proposed hybrid synthetic jets compared to the conventional synthetic jet. The hybrid synthetic jet with a convergence nozzle generates the best cooling ability among various configurations. This study provides significant guidance for the design of novel hybrid synthetic jets with high-efficiency impingement cooling performance.


Original languageEnglish
Article number113749
Number of pages14
JournalApplied Thermal Engineering
Early online date8 May 2019
Publication statusPublished - 5 Jul 2019


  • Confined space, Fluid diode, Heat transfer, Impingement cooling, Synthetic jet