EXPERIMENTAL AND NUMERICAL STUDY OF INSERTING AN INTERNAL HOLLOW CORE TO FINNED HELICAL COIL TUBE-SHELL HEAT EXCHANGER. J. eng. sustain. dev. [Internet]. 2021 Jan. 1 [cited 2024 May 2];25(1):1-14. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/71