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Experimental Investigation of Thermal Behavior of Swirling Coaxial Impinging Air Jet for Near-Field Impingement Cases
(Kırıkkale Üniversitesi, 2020) Markal, Burak
In this study, at the near-field impingement cases, the heat transfer characteristics of swirling coaxial impinging jets are experimentally investigated. In this context, different values of the dimensionless nozzle-to-plate distance (H / D = 0.2, 0.5, 0.75, 1.0) and the flowrate ratio (Q* = 0.33, 0.5, 0.66) are studied; and the combined effect of dimensionless nozzle-to-plate distance and flowrate ratio on thermal performance is researched. In the experiments, the total flowrate is kept constant at the value of 30 L/min; while the heating power is adjusted at the value of 18.2 W. A comparison with the conventional round jets is also performed over the temperature distribution of impingement plate. As a general trend, with increasing flowrate ratio, the area-averaged Nusselt numbers increase and the distribution of local Nusselt numbers has a more uniform character in the radial direction. For the smallest flowrate ratio and nozzle-to-plate distance, a significant enhancement occurs in the uniformity of heat transfer at the impingement region. Swirling coaxial jets improve the thermal performance much more compared to the conventional type jets.