This article presents a solar air heater channel artificially made rough with a transverse roughness in square-wave shape, investigated for the enhancement in heat transfer and fluid flow characteristics. Non-uniform profile of the ribs has been used by providing periodic gaps for reduction in eddies behind the rib. The research incorporates relative roughness width from 10-310, relative roughness pitch = 10, relative roughness height = 0.043, and Reynolds number from 3000-15000, respectively. The procedure followed for the CFD investigation has been confirmed with the experimental results. The maximum increment in Nusselt number was 2.22, and the consequent value for the friction factor increment of 3.44 was obtained. The highest THPP value of 1.49 was obtained while maximum thermal efficiency of 68.6 % was achieved. The non-uniform ribs were found better as compared to uniform ribs. The results have been demonstrated using graphical contours and streamlines.

本文介绍了一种人工制造的太阳能空气加热器通道，该通道具有方波形状的横向粗糙度，旨在提高传热和流体流动特性。通过提供周期性的间隙来减少肋骨后面的涡流，已经使用了肋骨的不均匀轮廓。该研究分别纳入了10-310的相对粗糙度宽度，10的相对粗糙度间距，0.043的相对粗糙度高度以及3000-15000的雷诺数。实验结果证实了CFD研究所遵循的程序。Nusselt数的最大增量为2.22，因此摩擦系数增量的结果值为3.44。最高THPP值为1.49，而最大热效率为68.6％。发现不均匀的肋骨比均匀的肋骨更好。使用图形轮廓和流线显示了结果。