فهرس المقالات Helical Annuli حرية الوصول المقاله صفحة الملخص نص كامل 1 - Experimental study of friction factors of multi-walled carbon nanotubes/water flow inside helical double-pipe heat exchangers Farzad Fathian Seyed Ali Agha Mirjalily Mohammad Reza Salimpour Seyed Amir Abbas Oloomi 10.30495/ijtnbm.2023.1974689.1016