Al2O3–Cu hybrid nanofluid flow and heat transfer characteristics in the duct with various triangular rib configurations

• Published in: Journal of thermal analysis and calorimetry Vol. 149; no. 17; pp. 10047 - 10060
• Main Authors: Togun, Hussein, Homod, Raad Z., Aljibori, Hakim S. Sultan, Abed, Azher M., Alias, Hajar, Hussein, Ahmed Kadhim, Biswal, Uddhaba, Al-Thamir, Mohaimen, Mahdi, Jasim M., Mohammed, Hayder I., Ahmadi, Goodarz
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.09.2024; Springer Nature B.V
• Subjects: Aluminum oxide; Analytical Chemistry; Angle of attack; Chemistry; Chemistry and Materials Science; Configurations; Cooling systems; Fluid flow; Heat exchangers; Heat transfer; Heat transfer coefficients; Inorganic Chemistry; Kinetic energy; Measurement Science and Instrumentation; Nanofluids; Physical Chemistry; Polymer Sciences; Reynolds number; Skin friction; Thermal management; Turbulent flow; Turbulent heat transfer; Pipes with triangular ribs; Turbulent flow; Hybrid nanofluids; Thermal performance
• ISSN: 1388-6150; 1588-2926
• DOI: 10.1007/s10973-024-13473-1

This study examines the turbulent heat transfer characteristics of Al 2 O 3 –Cu hybrid nanofluids in circular ducts with triangular rib configurations. Numerical simulations were conducted for a 25 cm long, -cm high duct with walls maintained at 313 K. Hybrid nanofluids enter at 298 K, with triangular ribs on the internal surface at three attack angles (45°, 60°, and 90°) spaced 20 mm apart. Al2O 3 –Cu/H 2 O hybrid nanofluids at concentrations of 0.1–2 vol.% were investigated for Reynolds numbers between 20,000 and 60,000. The study aimed to determine the optimal rib configuration and nanofluid concentration for enhancing heat transfer while minimizing friction losses. Key findings include: (1) the 60° rib configuration produced the highest local heat transfer coefficient, with the maximum occurring at the rib centers. (2) Increasing nanofluid concentration and Reynolds number enhanced heat transfer but reduced skin friction. (3) The optimal performance was achieved with 2 vol.% Al 2 O 3 –Cu at Re = 60,000. (4) Velocity contours revealed larger recirculation zones for 60° ribs compared to 45° and 90° configurations. (5) Turbulent kinetic energy was highest for 60° ribs, contributing to enhanced thermal performance. These findings have implications for improving the efficiency of heat exchangers, cooling systems, and other thermal management applications.