Experimental investigation of heat transfer characteristics and wall pressure distribution of swirling coaxial confined impinging air jets
作者： Burak Markal
DOI: 10.1016/J.IJHEATMASSTRANSFER.2018.03.101
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摘要: Abstract In the present study, swirling coaxial confined impinging turbulent air jets issuing from a novel designed nozzle is studied experimentally. Heat transfer characteristics and pressure distribution on impingement plate are analyzed. Experiments have been conducted at different dimensionless nozzle-to-plate distances (H/D = 0.5, 1.0, 1.5, 2.0 2.5) flow rates (Q∗ = 0.25, 0.50 0.75) for constant total flowrate of 1.33 × 10−3 m3 s−1 (80 L/min). The results show that ratio improves uniformity heat through surface increases average Nusselt number. Also, intensity convective shown to enhance significantly with decreasing distance. With regards distribution, subatmospheric regions occur plate. Contribution swirl also compared against pure circular jet condition (Q∗ = 0.0).
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