THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

Yindong Song

,

Dongshu Yang

,

Linfeng Xiang

,

Zhiyun Zhang

online first only

Amelioration of pool boiling thermal performance utilizing GNP-TiO2 hybrid nanofluid

ABSTRACT
Hydrophobic graphene nanosheets were successfully modified with titanium dioxide to create a pure and stable nanoparticle. The resulting material exhibited improved heat transfer efficiency when used as nanofluid in pool boiling. We prepared graphene nanofluid, titanium dioxide nanofluid, and graphene-titanium dioxide hybrid nanofluid with varying concentrations to investigate their heat transfer characteristics. The heat transfer coefficient of graphene-titanium dioxide hybrid nanofluid is higher than that of water at the same heat flow density, especially in the low heat flow density region( below q=4×105W/m2). Additionally, by employing a high-speed camera, we observed that the hybrid nanofluid displayed shorter bubble generation periods and smaller bubble separation diameters. These findings highlight the exceptional heat transfer performance of the covalently modified and hybridized nanofluid. Overall, our comprehensive testing program confirms the enhanced heat transfer capabilities of this modified nanofluid, positioning it as a promising choice for various heat transfer applications.
KEYWORDS
pool boiling, heat transfer coefficient, nanofluid, Bubble generation characteristics
PAPER SUBMITTED: 2024-10-19
PAPER REVISED: 2025-03-06
PAPER ACCEPTED: 2025-03-07
PUBLISHED ONLINE: 2025-04-05
DOI REFERENCE: https://doi.org/10.2298/TSCI241019063S
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Amelioration of pool boiling thermal performance utilizing GNP-TiO2 hybrid nanofluid