Stability And Thermal Conductivity Of Graphene And Barium Titanate (Iv) Nanofluid With Different Volume Concentrations
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Date
2021-06-01
Authors
Zulkifli, Noor Nazirulsyahmi
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The emerging of nanofluid as great potential coolant to be implemented in various
of applications due to its superior thermal properties has attracted many researchers to
studies this technology. This experiment aims to evaluate the stability and
thermophysical characteristic of the graphene and barium titanate (IV) nanoparticle in
distilled water as nanofluid for electronic cooling application. Synthesis of both
nanofluid was done through two-step method, where the mixture of nanoparticles will be
stirred using magnetic stirrer for 15 minutes, followed by probe sonication for 40 minutes
under 0.5 cycle and 50% amplitude. Based on visual observation, since after 1 day from
the sonication process, graphene nanofluid shows sedimentation while barium titanate
(IV) shows no sedimentation until 7 days where the height of white layer reduced for
barium titanate (IV) with 0.3% vol concentration gradually occurs. Graphene and barium
titanate (IV) nanofluid with 0.3% vol concentration shows the highest thermal
conductivity enhancement of 34.9% and 39.16% respectively. While graphene with
surfactant for both % vol concentration shows the same trend of thermal conductivity
enhancement with the range of 1.49% up to 30.57%. The addition of surfactant assists in
term of particle suspension in the fluid however SDBS surfactant is not suitable with
barium titanate (IV) due to the diverse affect in thermal conductivity. The thermal
conductivity increased as the nanoparticle concentration increases.