Thermal conductivity and viscosity of hybrid nanfluids prepared with magnetic nanodiamond-cobalt oxide (ND-Co3O4) nanocomposite

Thermal conductivity and viscosity of hybrid nanfluids prepared with magnetic nanodiamond-cobalt oxide (ND-Co3O4) nanocomposite

Synthesis of magnetic nanodiamond-cobalt oxide (ND-Co3O4) nanocomposite material; preparation of nanofluids and estimation of thermal properties such as thermal conductivity and viscosity has been explained experimentally in this paper. The nanocomposite material has been synthesized by using in-sit...

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Bibliographic Details
Published in:Case studies in thermal engineering Vol. 7; no. C; pp. 66 - 77
Main Authors: Sundar, L. Syam, Irurueta, G.O., Venkata Ramana, E., Singh, Manoj K., Sousa, A.C.M.
Format: Journal Article
Language:English
Published: Netherlands Elsevier Ltd 01-03-2016
Elsevier
Subjects:
Enhancement
Hybrid nanofluid
Nanocomposite
Thermal conductivity
Viscosity
Viscosity
Thermal conductivity
Nanocomposite
Enhancement
Hybrid nanofluid
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Summary:Synthesis of magnetic nanodiamond-cobalt oxide (ND-Co3O4) nanocomposite material; preparation of nanofluids and estimation of thermal properties such as thermal conductivity and viscosity has been explained experimentally in this paper. The nanocomposite material has been synthesized by using in-situ growth technique and chemical coprecipitation between cobalt chloride and sodium borohydrate. The various techniques such as XRD, TEM, XPS and VSM have been used to confirm the ND and Co3O4 phase of synthesized nanocomposite. The hybrid nanofluids have been prepared by dispersing synthesized ND-Co3O4 nanocomposite in water, ethylene glycol/water mixtures. The thermal properties such as thermal conductivity and viscosity have been measured experimentally at different weight concentrations and temperatures. The results reveal that the thermal conductivity enhancements are about 16%, 9%, 14%, 11% and 10% for water, EG, 20:80%, 40:60%, and 60:40% EG/W based nanofluids at 0.15wt% concentrations and at 60°C respectively. Similarly the viscosity enhancements are about 1.45-times, 1.46-times, 1.15-times, 1.19-times, and 1.51-times for water, EG, 20:80%, 40:60%, and 60:40% EG/W based nanofluids at 0.15wt% concentrations and at 60°C respectively. Based on the experimental data new correlations for thermal conductivity and viscosity have been developed.
Bibliography:USDOE
ISSN:2214-157X
2214-157X
DOI:10.1016/j.csite.2016.03.001