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- W2009664668 abstract "The present study aims to investigate the heat transfer characteristics of a pulsating axisymmetric air jet impinging on a heated wall. An axisymmetric contraction nozzle is used to obtain uniform profiles for the mean velocity and turbulence intensity at the nozzle exit. Measurements of the time averaged temperature on the impingement surface are conducted using a Thermochromatic Liquid Crystal(TLC) technique for steady and pulsating jets at the jet Reynolds numbers of 20000, 30000 and 40000. Considered are pulsation frequencies of 10 and 20 Hz, corresponding to Strouhal numbers below 0.06 based on nozzle width and jet discharge velocity. In addition, the effect of nozzle-to-plate distances in the range of 2 to l0 on heat transfer characteristics is assessed. The pulsating impinging jet provides more uniform heat transfer coefficient near the impingement region, irrespective of H/D. Based on the measured data, a good correlation as a function of the jet Reynolds and Nusselt numbers is reported. It is also found that an exponent m in the relation of Nu ?? Re^m depends on both r/D and H/D, by which the impinging jet flows are highly affected." @default.
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- W2009664668 date "2002-07-01" @default.
- W2009664668 modified "2023-09-26" @default.
- W2009664668 title "Heat Transfer Characteristics of a Pulsating Impinging Jet" @default.
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- W2009664668 doi "https://doi.org/10.3795/ksme-b.2002.26.7.903" @default.
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