“Experimental Investigation of the Effect of Curvature Ratio on Heat Transfer in Double Pipe Helical Heat Exchanger”. Al-Khwarizmi Engineering Journal 14, no. 1 (April 8, 2018): 10–18. Accessed December 4, 2024. https://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/110.