Evaluating the heat transfer characteristics of hybrid nanofluid flow in circular ducts with constant heat flux
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Full Text |
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Author |
Asan Suad Mohammed, Hanan Mohamad Akbar, Ali Azeez Ali, Shahen M. Fakhradldin and Ehsan F. Abbas
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e-ISSN |
1819-6608 |
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On Pages
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1906-1914
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Volume No. |
18
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Issue No. |
16
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Issue Date |
October 27, 2023
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DOI |
https://doi.org/10.59018/0823235
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Keywords |
hybrid nanofluid, heat transfer enhancement, ZnO and SiO2 nanoparticles, heating atconstant heat flux.
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Abstract
Researchers have recently been interested in introducing solid nanoparticles into thermal systems in order to
improve their thermal performance as a nanofluid. Researchers have investigated nanoparticle types, sizes, and
concentrations using theoretical, numerical, and experimental approaches. In the present study, a hybrid nanofluid was
utilized in two concentrations, namely (0.5% ZnO+0.5% SiO2-distilled water) and (1% ZnO+1% SiO2-distilled water), in
a 45o inclined heated pipe at a constant heat flux of 12000 W/m2 and a range of 4000 to 12000 for the Re number.Initially, the
performance of the test apparatus was evaluated using distilled water in the same conditions as the hybrid nanofluids
experiment, and its results were compared to an empirical relation to ensure accurate results. The experimentation results
indicated that the nanofluids significantly improved heat transfer coefficients when nanoparticle concentration increased in
hybrid fluids. This indicates that increasing nanoparticle concentrations can substantially improve heat transfer coefficients.
Using hybrid nanofluids with a concentration of (0.5 and 1)% increases the heat transfer coefficient by 1.2 and 1.4 times
compared to distilled water.
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