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  • effect of flow diverters on free convection heat transfer from a pair of vertical arrays of isothermal cylinders

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 974
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      laminar free convection heat transfer from two vertical arrays of five isothermal cylinders separated by flow diverters is studied experimentally using a mach–zehnder interferometer. the width of flow diverters is kept constant to two-cylinder diameters and the cylinders vertical center-to-center spacing is equal to three-cylinder diameter. effect of the ratio of the horizontal spacing between two cylinder arrays to their diameter (sh/d) on heat transfer from the cylinders is investigated for various rayleigh numbers. the experiments are performed for sh/d = 2–4, and the rayleigh number based on the cylinder diameter ranging from 103 to 3  103. it is observed that for small sh/d ratios, the flow diverters have a negative effect on the total rate of heat transfer from the arrays; while by increasing the horizontal center to center spacing, they tend to enhance the overall cooling rate of the array. moreover, increasing ra and sh/d generally results in a higher average nusselt number for each cylinder in the array.

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