Kumar, Thakur Sanjay, N.S. Thakur, Anoop Kumar, and Vijay Mittal. “Use of Artificial Roughness to Enhance Heat Transfer in Solar Air Heaters – a Review”. Journal of Energy in Southern Africa 21, no. 1 (February 1, 2010): 35–51. Accessed July 5, 2024. https://journals.assaf.org.za/index.php/jesa/article/view/3248.