Optimisation of nanofluid properties for reduced in situ nanoparticle agglomeration
File(s)
Accepted version
Author(s)
Kouloulias, Konst
Sergis, Antonis
Hardalupas, Ioannis
Type
Conference Paper
Abstract
For the formulation of stable and durable nanofluidsattention should be paid on the preparation method. Key parameters to consider include the characteristics of the nanoparticles, the properties of the base fluids,the presence of surface-active agentsand the pH value of the nanofluids. An optimisation study of nanofluid properties was conducted tominimise nanoparticle agglomeration, thus reducing sedimentation during turbulent Rayleigh-Bénard convection(RBC). Three types of Al2O3-H2O nanofluidswith different consistencies and characteristics were prepared, with andwithout employing the electrostatic stabilisation method, tested and comparedin terms of the natural convective heat transfer performance. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) measurements were performedtoobtain a spherical view of the nature and the characteristics of the nanofluids.It is reported that the electrostatic stabilization method and the proper selection of nanoparticles can improve the nanofluid stability, by reducing the nanoparticle agglomerationand improve the natural convectiveheat transfer performance of nanofluids. By comparing data from the TEM and DLS nanoparticle analysis, it is concluded that the average size of nanoparticles in the synthesized nanofluids is questionablein practice. Asystematic approach for the formulation of nanofluids and presentation of datais needed, so that reliable, reproducible and comparable results can be obtained that could eliminate the existing discrepancy among the findings in the literature.
Date Issued
2019-06-01
Date Acceptance
2019-01-29
Citation
1st International Conference on Nanofluids (ICNf2019), 2019
Publisher
Nanouptake COST Action
Journal / Book Title
1st International Conference on Nanofluids (ICNf2019)
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
Kouloulias - Doctoral Prize
Source
1st International Conference on Nanofluids (ICNf2019) / 2nd European Symposium on Nanofluids (ESNf2019)
Publication Status
Published
Start Date
2019-01-29
Coverage Spatial
Castelló, Spain