EXPERIMENTAL AND NUMERICAL STUDY OF ENHANCEMENT HEAT TRANSFER COEFFICIENT IN SPIRAL FLUTED TUBE HEAT EXCHANGER WITH NANOFLUID. J. eng. sustain. dev. [Internet]. 2015 Nov. 1 [cited 2024 May 12];19(6):165-83. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/788