Al2O3-Cu hybrid nanofluid flow and heat transfer characteristics in the duct with various triangular rib configurations by Togun, Hussein, Homod, Raad Z., Sultan Aljibori, Hakim S., Abed, Azher M., Alias, Hajar, Hussein, Ahmed Kadhim, Biswal, Uddhaba, Al-Thamir, Mohaimen, Mahdi, Jasim M., Mohammed, Hayder I., Ahmadi, Goodarz