On trade-off for dispersion stability and thermal transport of Cu-Al2O3 hybrid nanofluid for various mixing ratios

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

1 Scopus Citations
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Author(s)

  • F. R. Siddiqui
  • C. Y. Tso
  • K. C. Chan
  • S. C. Fu
  • Christopher Y.H. Chao

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)1200-1216
Journal / PublicationInternational Journal of Heat and Mass Transfer
Volume132
Early online date19 Dec 2018
Publication statusPublished - Apr 2019

Abstract

The dispersion stability and thermophysical properties of metal–metal oxide hybrid nanofluid for various mixing ratios are investigated in this paper. Cu nanoparticles having high thermal conductivity and poor dispersion stability are dispersed in water with Al2O3 nanoparticles that have a high dispersion stability and low thermal conductivity, in mixing ratios 0.3:0.7 (MR-1), 0.5:0.5 (MR-2) and 0.7:0.3 (MR-3) to achieve a Cu-Al2O3 hybrid nanofluid with improved hydrothermal properties. Dispersion stability and thermophysical properties of the hybrid nanofluid were studied for 240 h using various experimental techniques such as zeta/particle size analyser, UV–Vis spectroscopy, transmission electron microscope, sedimentation, thermal analyser and viscometer. The results show that the hybrid nanofluid transforms into low, medium and high concentration stratified zones over time. Also, stability in Cu/Al2O3 single particle nanofluids and MR-3 hybrid nanofluid is related to both sedimentation velocity and zeta potential while sedimentation velocity has the dominating effect on stability of MR-1 and MR-2 hybrid nanofluids. Mixing ratio above MR-2 is identified for rapid settling due to high sedimentation velocity. Also, MR-2 is determined as an optimum mixing ratio to achieve enhanced overall hydrothermal properties for the hybrid nanofluid due to its improved thermal conductivity and relatively better stability.

Research Area(s)

  • Agglomeration, Hybrid Nanofluid, Sedimentation Velocity, Stability, Thermophysical Properties, Zeta Potential

Citation Format(s)

On trade-off for dispersion stability and thermal transport of Cu-Al2O3 hybrid nanofluid for various mixing ratios. / Siddiqui, F. R.; Tso, C. Y.; Chan, K. C.; Fu, S. C.; Chao, Christopher Y.H.

In: International Journal of Heat and Mass Transfer, Vol. 132, 04.2019, p. 1200-1216.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review