ISSN Online: 2688-7231
ISBN Online: 978-1-56700-524-0
Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
Impingement Heat Transfer Enhancement by Synthetic Jet Array
In the presentresearch, the cooling characteristics of a synthetic jet array consisting of three slot orifice synthetic jet actuators (SJA) placed adjacent to each other and controlled distinctively is studied by using computational fluid dynamics simulations. The influence oforifice-to-heated wall distance (H) and phase difference (Ø) between the actuatorson the heat transfer enhancement is presented here. Open FOAM, an open-source software, is used to perform numerical simulations. For the present analysis, Reynolds number (Re) and Strouhal number (St) are maintained as 300 and 0.025, respectively. Similarly, the stream-wise distance from orifice exit to heated plate varies from 2 ≤ H/d ≤ 15.The sensitiveness of jets cooling performance is studied for phase delay of Ø = 0°, 45°, and 90°. For H/d = 2, the synthetic jet array possesses a peak average Nusselt Number of 52 observed at the stagnation point. However, for lower H/d ratios, impinging jets feel a strong suction effect attributed to a narrow cooling curve. An opposite phenomenon with a much wider and higher intensity merged turbulent jet was found far downstream, which is highly unlikein a single jet.