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- W2897315458 abstract "Experimental results for friction factor and heat transfer coefficients for flow through a square duct with delta wing vortex generators on two opposite walls are reported. The effects of geometrical parameters such as pitch-to-height ratio, aspect ratio, and height-to-duct hydraulic diameter ratio on the heat transfer coefficient and pressure drop were studied. Comprehensive results for a single vortex generator and limited data for two vortex generators in the spanwise direction at a given axial location are presented. Detailed local heat transfer distributions are presented for selected configurations. High heat transfer coefficients were observed both underneath and between successive vortex generator elements. The magnitudes of average heat transfer coefficients on the smooth walls adjacent to the roughened walls were only about 10% lower than those for the roughened walls. The ratio of Nusselt number and friction factor with and without the delta wing vortex generators for constant Reynolds number conditions are presented. The Nusselt number ratios at constant pumping power condition are also reported; the highest values for a single and two vortex generators at an axial location were observed to be 2.8 and 3.1, respectively. Semi-empirical correlations for heat transfer and friction factor, developed on the basis of available methodologies for roughened ducts, predict the measured data to within an error of about 15%." @default.
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- W2897315458 date "2019-01-01" @default.
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- W2897315458 title "HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS FOR FLOW THROUGH SQUARE CHANNEL WITH DELTA WING VORTEX GENERATOR ELEMENTS ON TWO OPPOSITE WALLS" @default.
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- W2897315458 doi "https://doi.org/10.1615/jenhheattransf.2018024657" @default.
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