Abdullah, M.S. and Hussein, A.M. 2023. Experimental and Numerical Investigations on the Heat Transfer of a Helical Coil Heat Exchanger Utilized α-Al2 O3 nanofluid . Diyala Journal of Engineering Sciences . 16, 3 (Sep. 2023), 64–81. DOI:https://doi.org/10.24237/djes.2023.16306.