Zhang Jun , Muhammad Ayaz Akbar , Tareq Manzoor , Ahsan Ali , M.Amjad. “CFD Analysis of Circular Pipe Flat Plate Solar Collector”. International Journal of Emerging Trends in Science and Technology, vol. 4, no. 10, Oct. 2017, pp. 6266-71, http://ijetst.in/index.php/ijetst/article/view/1236.