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Your search keyword '"Abed, Azher M."' showing total 126 results
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126 results on '"Abed, Azher M."'

46. Experimental investigation and thermodynamic analysis of application of hybrid nanofluid in a parabolic solar trough collector.

Author

Wang, He, Abed, Azher M., Beemkumar, N., Kumar, Ambati Vijay, Ayed, Hamdi, Mouldi, Abir, and Shamel, Ali

Subjects
*PARABOLIC troughs, *MULTIWALLED carbon nanotubes, *IRON oxide nanoparticles, *NANOFLUIDS, *HEAT transfer fluids, *WORKING fluids, *FLUID flow
Abstract

In this research, thermal modeling has been done to investigate the effect of nanofluid on the performance of the linear parabolic collector. Therminol vapor/liquid phase fluid (VP-1) has been used as a base fluid; iron oxide nanoparticles have been used to produce mono-nanofluid; and iron oxide multi-walled carbon nanotubes nanocomposite has been used as nanoparticles to produce hybrid nanofluid. The fluid flow inside the absorber tube of the collector is assumed to be turbulent. The results show that when hybrid nanofluid and mono-nanofluid are used, the energy and exergy efficiencies of the collector are higher than those for the conditions of using the base fluid, but their amount is slightly lower with the use of hybrid nanofluid than when the working fluid is mono-nanofluid. According to the obtained results, the highest energy efficiency of the linear parabolic collector using nanofluid and mono-nanofluid is 70.2% and 70.4%, respectively, and the highest exergy efficiency is 35.7% and 35.9%, respectively. Despite this, the friction coefficient of mono-nanofluid compared to hybrid nanofluid was obtained on average about 9% higher. The results showed that the criterion for evaluating the performance of the collector (hydrodynamic thermal efficiency) when hybrid nanofluid is used is more than when mono-nanofluid is used. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Al2O3–Cu hybrid nanofluid flow and heat transfer characteristics in the duct with various triangular rib configurations.

Author

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., and Ahmadi, Goodarz

Subjects
TURBULENT heat transfer, HEAT transfer coefficient, HEAT exchanger efficiency, TURBULENT flow, FRICTION losses
Abstract

This study examines the turbulent heat transfer characteristics of Al2O3–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. Al2O3–Cu/H2O 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.% Al2O3–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. [ABSTRACT FROM AUTHOR]

Published
2024
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