Use of artificial roughness in the duct of solar air heater (SAH) has been an interesting area of research during the last few decades. In present review article a holistic view about application of circular shape wire ribs as roughness element and its different geometry on the absorber plate of SAH duct for performance enhancement has been done. This article, reported in details numerous experimental as well as analytical studies for rib roughened SAHs which have been carried out by different researchers positively. Correlations for heat transfer and friction factor, developed by various investigators for different artificially roughened solar air heaters (SAHs) geometry have been reported in chronological order and in well tabulated form. The roughness and operating parameters into which investigators have obtained their maximum performances of SAHs have also been presented separately in the table. Effects of various rib roughness parameters on heat transfer and fluid flow process are also discussed in details.

在过去的几十年中，在太阳能空气加热器（SAH）的管道中使用人造粗糙度是一个有趣的研究领域。在当前的评论文章中，已经完成了关于将圆形线肋用作粗糙度元件及其在SAH管道的吸收板上的不同几何形状以提高性能的整体研究。这篇文章详细报道了由肋骨粗糙的SAH进行的许多实验和分析研究，这些研究由不同的研究人员积极地进行。由研究人员针对不同的人工粗糙化太阳能空气加热器（SAH）几何形状开发的传热和摩擦系数的相关性已按时间顺序并以表格形式进行了报道。表中还单独列出了研究人员获得SAH最佳性能的粗糙度和操作参数。还详细讨论了各种肋粗糙度参数对传热和流体流动过程的影响。