Heat Transfer Characteristics Of A Pair Of Impinging Synthetic Jets: Effect Of Orifice Spacing And Impingement Distance
6TH EUROPEAN THERMAL SCIENCES CONFERENCE (EUROTHERM 2012)(2012)
摘要
Recent research has shown that an impinging synthetic jet attains local heat transfer rates that rival those of a steady impinging jet. A single synthetic jet still requires a buoyancy-driven or forced cross flow to avoid recirculation of heated fluid. However, multiple adjacent synthetic jets exhibit a fluidic interaction that results in flow vectoring towards the direction of the jet leading in phase. Previous results have shown a significant heat transfer enhancement and the establishment of a jet-induced cross-flow, which could eliminate the need for an external forced cross-flow. This paper presents the findings of an experimental study to optimize the orifice-to-impingement distance H and orifice centre-to-centre separation distance S. The convective heat transfer rate is determined on an electrically heated metal foil using thermal imaging. The jets are driven by a pair of adjacent jet actuators forcing air through two rectangular slot orifices of width D = 1.65mm and aspect ratio alpha = 27:1. The jets are maintained at a constant Reynolds number and stroke length (Re = 600, L-0/D = 29). For the parameter range considered, an optimum setting of H/D = 24 and S/D = 3 operated within a phase difference region of 60 degrees < Phi < 120 degrees gives the best cooling performance.
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关键词
Synthetic Jets,Heat Transfer
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