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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigations on heat transfer and frictional characteristics of a turbulator roughened solar air heater duct
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Experimental investigations on heat transfer and frictional characteristics of a turbulator roughened solar air heater duct

机译：扰流器粗糙太阳能空气加热器管道传热和摩擦特性的实验研究

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摘要

An experimental investigation has been carried out to study the heat transfer coefficient and friction factor by using artificial roughness in the form of specially prepared inverted U-shaped turbulators on the absorber surface of an air heater duct. The roughened wall is uniformly heated while the remaining three walls are insulated. These boundary conditions correspond closely to those found in solar air heaters.rnThe experiments encompassed the Reynolds number range from 3800 to 18000; ratio of turbulator height to duct hydraulic mean diameter is varied from, e/D_h = 0.0186 to 0.03986 (D_h = 37.63 mm and e = 0.7 to 1.5 mm) and turbulator pitch to height ratio is varied from, p/e = 6.67 to 57.14 (p = 10 to 40 mm). The angle of attack of flow on turbulators, α = 90° kept constant during the whole experimentation. The heat transfer and friction factor data obtained is compared with the data obtained from smooth duct under similar geometrical and flow conditions. As compared to the smooth duct, the turbulator roughened duct enhances the heat transfer and friction factor by 2.82 and 3.72 times, respectively. The correlations have been developed for area averaged Nusselt number and friction factor for turbulator roughened duct.
机译：已经进行了实验研究，以通过在空气加热器管道的吸收器表面上使用特殊准备的倒U形湍流器形式的人工粗糙度来研究传热系数和摩擦系数。粗糙的壁被均匀地加热，而其余三个壁被绝缘。这些边界条件与太阳能空气加热器中的边界条件非常接近。rn实验包括雷诺数范围从3800到18000。涡轮高度与风道液压平均直径的比值从e / D_h = 0.0186到0.03986（D_h = 37.63 mm和e = 0.7至1.5 mm）改变，并且涡轮机螺距与高度的比值在p / e = 6.67至57.14之间变化（p = 10至40 mm）。在整个实验过程中，气流对湍流的迎角α= 90°保持恒定。将获得的传热和摩擦系数数据与在类似几何条件和流动条件下从光滑管道获得的数据进行比较。与光滑导管相比，湍流器粗糙导管将传热和摩擦系数分别提高了2.82和3.72倍。已经为湍流器粗糙管的面积平均努塞尔数和摩擦系数建立了相关性。

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