Thermo-physical properties of Al2O3-SiO2/PAG composite nanolubricant for refrigeration system

•Measurement of thermal conductivity and viscosity for composite nanolubricant.•Measurements are undertaken for Al2O3-SiO2/PAG composite nanolubricant.•The maximum enhancement of thermal conductivity was 2.41% at 0.1% concentration.•Relative viscosity was 9.71% times higher than PAG at 0.1% concentr...

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Bibliographic Details
Published in:International journal of refrigeration 2017-08, Vol.80, p.1-10
Main Authors: Zawawi, N.N.M., Azmi, W.H., Redhwan, A.A.M., Sharif, M.Z., Sharma, K.V.
Format: Article
Language:English
Subjects:
Composite nanolubricants
Conductivité thermique
Dynamic viscosity
Nanolubrifiants composites
Newtonian
Newtonien
Refrigeration system
Système frigorifique
Thermal conductivity
Viscosité dynamique
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Summary:•Measurement of thermal conductivity and viscosity for composite nanolubricant.•Measurements are undertaken for Al2O3-SiO2/PAG composite nanolubricant.•The maximum enhancement of thermal conductivity was 2.41% at 0.1% concentration.•Relative viscosity was 9.71% times higher than PAG at 0.1% concentration and 333K.•Composite nanolubricant behaved better properties compared to single nanolubricant. 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.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2017.04.024