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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/45996

    Title: Flow structures and heat transfer characteristics in fan flows with and without delta-wing vortex generators
    Authors: Chen, Tseng-Yuan;Shu, H. T.
    Contributors: 淡江大學航空太空工程學系
    Keywords: Aerodynamics;Ducts;Fans;Heat transfer;Kinetic energy;Laser Doppler velocimeters;Turbulence;Velocity measurement;Wings;Fan flow;Uniform flow;Vortex flow;delta wing;heat transfer;kinetics;laser Doppler velocimeter;turbulence;velocimetry;vortex generator
    Date: 2004-03
    Issue Date: 2013-03-20 16:18:59 (UTC+8)
    Publisher: Philadelphia: Elsevier Inc.
    Abstract: Effects of an external delta-wing vortex generator on the flow and heat transfer characteristics in fan flows and uniform flows were experimentally investigated and compared. A heated plate, installed on the bottom wall of a duct, was used as the heat transfer surface. Three-component mean and fluctuating velocity measurements were conducted using a laser Doppler velocimetry to characterize the flow structures and to obtain the near-wall flow parameters, including the axial mean velocity, axial vorticity and turbulent kinetic energy. Temperatures on the heat transfer surface were measured using thermocouples to obtain the Nusselt numbers. Results show that the external delta-wing vortex generator in fan flows has little overall effect on the near-wall averaged axial mean velocity and axial vorticity, but increases the turbulent kinetic energy, in the investigated X/D ranges. The increase in the turbulent kinetic energy by the delta-wing has little effect on heat transfer in the inherently vortical fan flows. Consequently, the delta-wing vortex generator in fan flows has little effect on the heat transfer augmentation.
    Relation: Experimental Thermal and Fluid Science 28(4), pp.273-282
    DOI: 10.1016/S0894-1777(03)00107-9
    Appears in Collections:[Graduate Institute & Department of Aerospace Engineering] Journal Article

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