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Thermo-Physical Properties of Al2O3-SiO2/PAG Composite Nanolubricant for Refrigeration System

Nurul Nadia, Mohd Zawawi and Azmi, W. H. and Redhwan, A. A. M. and M. Z., Sharif and Sharma, K. V. (2017) Thermo-Physical Properties of Al2O3-SiO2/PAG Composite Nanolubricant for Refrigeration System. International Journal of Refrigeration, 80. pp. 1-10. ISSN 0140-7007

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Abstract

Thermal conductivity and viscosity of the Al2O3-SiO2/PAG composite nanolubricants for 0.02 to 0.1% volume concentrations at a temperature range of 303 to 353 K were investigated. Al2O3 and SiO2 nanoparticles were dispersed in the Polyalkylene Glycol (PAG 46) lubricant using the two-step method of preparation. Thermal conductivity and viscosity were measured using KD2 Pro Thermal Properties Analyzer and LVDV-III Rheometer, respectively. The result shows that the thermal conductivity and viscosity of composite nanolubricants increase with volume concentration and decreases with temperature. Composite nanolubricants behave as Newtonian in the range of the temperatures and volume concentrations studied. The highest thermal conductivity increment is 2.41% at 0.1% concentration and temperature of 303 K. A maximum value of 9.71% in viscosity at 0.1% concentration is observed at temperature of 333 K. A new correlation model to predict the properties of composite nanolubricants has been proposed for applications in refrigeration systems.

Item Type: Article
Uncontrolled Keywords: Composite nanolubricants; Thermal conductivity; Dynamic viscosity; Newtonian Refrigeration system
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Institute of Postgraduate Studies
Depositing User: Dr. Wan Azmi Wan Hamzah
Date Deposited: 27 Nov 2017 04:20
Last Modified: 17 Oct 2019 08:12
URI: http://umpir.ump.edu.my/id/eprint/19194
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