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Development Of Correlations For Nusselt Number And Friction Factor For Solar Air Heater With Roughened Duct Having Arc-shaped Wire As Artificial Roughness

机译：弧形线作为人工粗糙度的风管粗糙的太阳能空气加热器的努塞尔数与摩擦系数的相关性研究

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摘要

An experimental study has been carried out for enhancement of heat transfer coefficient of a solar air heater having roughened air duct provided with artificial roughness in the form of arc-shape parallel wire as roughness element. Increment in friction factor by provided with such artificial roughness elements has also been studied. The effect of system parameters such as relative roughness height (e/d) and arc angle (α/90) have been studied on Nusselt number (Nu) and friction factor (f) with Reynolds number (Re) varied from 2000 to 17000. Considerable enhancement in heat transfer coefficient has been achieved with such roughness element. Using experimental data correlations for Nusselt number and friction factor have also been developed for such solar air heaters, which gives a good agreement between predicted values and experimental values of Nusselt number and friction factor.
机译：已经进行了实验研究，以提高具有粗糙化的空气管道的太阳能空气加热器的传热系数，该粗糙化的空气管道具有以弧形平行线形式的人工粗糙度作为粗糙度元件。还研究了通过设置这种人工粗糙度元件来增加摩擦系数。研究了系统参数（例如相对粗糙度高度（e / d）和弧角（α/ 90））对Nusselt数（Nu）和摩擦系数（f）的影响，雷诺数（Re）在2000到17000之间变化。用这种粗糙度元件已经实现了传热系数的显着提高。利用实验数据，已经为这种太阳能空气加热器开发了努塞尔数和摩擦因数的相关性，这使努塞尔数和摩擦因数的预测值与实验值之间具有良好的一致性。

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