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    題名: Heat Transfer and Flow Characteristics in Impinging Flows with Turbulators
    作者: Chen, Tzeng-yuan;Li, Chia-ching
    貢獻者: 淡江大學航空太空工程學系
    關鍵詞: Convective heat transfer;Impinging flow;Turbulator
    日期: 2007-03
    上傳時間: 2013-03-20 16:26:26 (UTC+8)
    出版者: 臺北縣:淡江大學
    摘要: The heat transfer characteristics in impinging flows with turbulators were experimentally investigated. The flow characteristics were also measured to elucidate the obtained heat transfer results. Uniform flows were generated at the inlet of a duct, and flowed out through the duct side-open slots near the duct end. A heat-transfer surface was located at the duct end, perpendicular to the incoming flow for heat transfer measurements. A pair of turbulator was mounted on the duct walls at the duct inlet, including rectangular-plate and triangular-plate turbulators, 45 and 90 angle of attacks. Temperatures on the heat-transfer surface were measured by thermocouples to obtain the average Nusselt number. Three-component mean and fluctuating velocity measurements by laser Doppler velocimetry were conducted to characterize the flow structures and to obtain the flow characteristics near the heat-transfer surface. Results show that the turbulators have the effect to increase the flow mean impinging velocity, axial vorticity and turbulent kinetic energy near the heat transfer surface and, thus, to augment the heat transfer. The 90 rectangular-plate turbulator and 45 delta-wing turbulator cause the largest and least heat transfer augmentation among the investigated turbulators, respectively.
    關聯: 淡江理工學刊=Tamkang Journal of Science and Engineering 10(1),頁95-101
    顯示於類別:[航空太空工程學系暨研究所] 期刊論文

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