Experimental investigation on the stability of 40% ethylene glycol based TiO2-Al2O3 hybrid nanofluids
This paper is presented to investigate experimentally on the stability of 40% ethylene glycol-based TiO2-Al2O3 hybrid nanofluids. Recently, the research is more highlighted on the thermophysical-properties of nanofluids. Hence, the stability of the hybrid nanofluids thoroughly assessed in this re...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en en |
| Published: |
Penerbit Akademia Baru
2020
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/85948/1/85948_Experimental%20Investigation%20on%20the%20Stability.pdf http://irep.iium.edu.my/85948/2/85948_Experimental%20Investigation%20on%20the%20Stability_SCOPUS.pdf http://irep.iium.edu.my/85948/ http://www.akademiabaru.com/doc/ARFMTSV69_N1_P110_121.pdf |
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| Summary: | This paper is presented to investigate experimentally on the stability of 40% ethylene
glycol-based TiO2-Al2O3 hybrid nanofluids. Recently, the research is more highlighted
on the thermophysical-properties of nanofluids. Hence, the stability of the hybrid
nanofluids thoroughly assessed in this research work. The study uses the two-step
method for preparing 40% ethylene glycol-based TiO2-Al2O3 hybrid nanofluids. The
experiment is carried out for the various combination of mixture ratios including 20:80,
40:60, 50:50, 60:40 and 80:20 of TiO2-Al2O3 nanoparticles with a volume concentration
of 0.1%. The stability assessment of hybrid nanofluids is accomplished through
visualisation effect, transmission electronic microscopic observation, UV-Vis
spectrophotometry and zeta potential value from particle size analyser. The findings
show the optimum mixing ratios of TiO2-Al2O3 nanoparticles in terms of stability which
is further confirmed by Zeta potential and absorbency from UV-Vis
spectrophotometry. The results from the study reveal that 80:20 ratio of TiO2-Al2O3
nanoparticles possesses the best uniformity for over 21 days without any noticeable
settlement of particles in the colloidal suspension. Moreover, 50:50 and 60:40 ratios
show modest stability for almost two weeks while 20:80 and 40:60 ratios of TiO2-Al2O3
nanoparticles show minimum stability along with rapid sedimentation in the
dispersion. However, it is also evident that the optimum mixing ratio of TiO2-Al2O3
hybrid nanofluids has excellent stability which will lead to further study on the thermal
properties of nanofluids and finally motivate engineers to the real-life application of
nanofluids. |
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