RETRACTED ARTICLE: Augmentations of solar collector performance with involve of nanomaterial and perforated twisted tape

Perforated tape with obstacle was applied inside the absorber pipe filled nanomaterial to intensify efficiency of current solar collector. Simulations were done via ANSYS FLUENT incorporating K–ε for turbulent flow and homogenous model nanomaterial. To reduce computation price, optimized size grid has been selected verification based on previous published data show nice accuracy. Height number revolutions assumed as variables in simulations. Insert turbulator makes residence time augment stronger interaction wall outer become colder. Although insert convection increase, resistance augments, too. Therefore, article, perforated shape utilized rotational velocity, obstacles over utilized. Augment height revolution can enhance velocity about 4.58% 7.04%. The temperature diminishes around 0.11% 2.1% elevate N Re.