Alawi, Omer A. and Abdelrazek, Ali H. and Aldlemy, Mohammed Suleman and Ahmed, Waqar and Hussein, Omar A. and Ghafel, Sukaina Tuama and Khedher, Khaled Mohamed and Scholz, Miklas and Yaseen, Zaher Mundher (2021) Heat transfer and hydrodynamic properties using different metal-oxide nanostructures in horizontal concentric annular tube: An optimization study. Nanomaterials, 11 (8). ISSN 2079-4991, DOI https://doi.org/10.3390/nano11081979.
Full text not available from this repository.Abstract
Numerical studies were performed to estimate the heat transfer and hydrodynamic properties of a forced convection turbulent flow using three-dimensional horizontal concentric annuli. This paper applied the standard k-epsilon turbulence model for the flow range 1 x 10(4) <= Re >= 24 x 10(3). A wide range of parameters like different nanomaterials (Al2O3, CuO, SiO2 and ZnO), different particle nanoshapes (spherical, cylindrical, blades, platelets and bricks), different heat flux ratio (HFR) (0, 0.5, 1 and 2) and different aspect ratios (AR) (1.5, 2, 2.5 and 3) were examined. Also, the effect of inner cylinder rotation was discussed. An experiment was conducted out using a field-emission scanning electron microscope (FE-SEM) to characterize metallic oxides in spherical morphologies. Nano-platelet particles showed the best enhancements in heat transfer properties, followed by nano-cylinders, nano-bricks, nano-blades, and nano-spheres. The maximum heat transfer enhancement was found in SiO2, followed by ZnO, CuO, and Al2O3, in that order. Meanwhile, the effect of the HFR parameter was insignificant. At Re = 24,000, the inner wall rotation enhanced the heat transfer about 47.94%, 43.03%, 42.06% and 39.79% for SiO2, ZnO, CuO and Al2O3, respectively. Moreover, the AR of 2.5 presented the higher heat transfer improvement followed by 3, 2, and 1.5.
| Item Type: | Article |
|---|---|
| Funders: | Deanship of Scientific Research at King Khalid University[RGP 1/372/42] |
| Uncontrolled Keywords: | Concentric annuli;Turbulent mixed convection;Nanofluids; nanoparticle shape;Hydrodynamic properties |
| Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 20 Jun 2022 07:56 |
| Last Modified: | 20 Jun 2022 07:56 |
| URI: | http://eprints.um.edu.my/id/eprint/34141 |
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