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Heat transfer coefficient of nucleate boiling in low concentration level of single and hybrid Al2O3-SiO2 waterbased nanofluids

Muhamad Hadie Aizzat, Asli and Muhamad Zuhairi, Sulaiman and Enoki, Koji and Okawa, Tomio Heat transfer coefficient of nucleate boiling in low concentration level of single and hybrid Al2O3-SiO2 waterbased nanofluids. IOP Conference Series: Materials Science and Engineering, 469 (012109). pp. 1-10. ISSN 1757-8981 (Print), 1757-899X (Online)

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Abstract

Experiments were conducted to identify the Heat Transfer Coefficient (HTC) in saturated pool boiling of single and hybrid water-based nanofluids. In these experiments, Al2O3 and SiO2 nanoparticles were selected and diluted into two separate single nanofluids, and they were mixed in a different ratio from 0:100, 25:75, 50:50, 75:25 and 100:0 percent to achieve a final total concentration of 0.001 vol. %. Successively, the mixtures were used to obtain the HTC values through experimental works. In the present work, it was found that in the lowest concentration (0.00025 vol.%) of Al2O3 nanofluid, the HTC enhanced considerably but deteriorated for SiO2 nanofluid. Separately, as for the hybrid nanofluids, the HTCs were dramatically enhanced at the initial stage but slowly deteriorated once the time variation increased, especially in a higher ratio of SiO2 nanofluid. The deposition of the nanoparticles onto the surface heater suggested being the main factor, where in the present case, the significant coexisting effect of the deposited hybrid nanoparticles (Al2O3 and SiO2) on the heated surface to the changes of ΔTW due to different nanoparticles properties.

Item Type: Article
Uncontrolled Keywords: Heat transfer coefficient; nucleate boiling; hybrid Al2O3-SiO2 waterbased nanofluids
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Ms. Ratna Wilis Haryati Mustapa
Date Deposited: 17 Dec 2019 09:58
Last Modified: 17 Dec 2019 09:58
URI: http://umpir.ump.edu.my/id/eprint/25747
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