The most suitable approach to augment convective heat release rate is to fabricate the roughness underside of solar air heater (SAH) duct. This paper reveals an experimental effort made to augment the thermal performance of aligned gaps along with staggered element on SAH with minimum frictional consequence. The V-rib roughness namely aligned gaps in V-rib with staggered element roughness is evaluated with investigated range of parameters as relative rib height (e/D_h) 0.043, number of gaps (N_g) 2–5, relative gap breadth (g/e) 2–5, relative rib pitch (P/e) 10, relative staggered roughness pitch (P’/P) 0.4 and relative staggered rib length (r/g) 1. As per the selected mass flow rate Reynolds number varied from 4000 to 14,000. The result shows the augmentation in Nusselt number (Nu) value and friction factor (f) which is recorded as 2.16 times and 2.73 times respectively compared to flat plate surface. Performance of aligned gaps in V-rib with staggered element corresponding to studied geometrical parameters of roughness is compared with contemporary better performing V- rib geometry has also been done.

增加对流热释放率最合适的方法是制造太阳能空气加热器 (SAH) 管道的粗糙底面。本文揭示了一项实验工作，旨在以最小的摩擦后果来增强 SAH 上对齐间隙和交错元件的热性能。V 形肋粗糙度，即 V 形肋中具有交错单元粗糙度的对齐间隙，通过研究的参数范围进行评估，如相对肋高度 ( e/D _h ) 0.043、间隙数 ( N _g ) 2-5、相对间隙宽度（g/e ) 2–5, 相对肋间距 ( P/e ) 10, 相对交错粗糙度间距 ( P'/P ) 0.4 和相对交错肋长度 ( r/g) 1. 根据选定的质量流量，雷诺数从 4000 到 14,000 不等。结果表明，与平板表面相比，努塞尔数 ( Nu ) 值和摩擦系数 ( f ) 分别增加了 2.16 倍和 2.73 倍。具有与研究的粗糙度几何参数相对应的交错元素的 V 形肋中对齐间隙的性能与当代性能更好的 V 形肋几何形状进行了比较。