Viscosity and thermal conductivity of aluminum nitride - ethylene glycol (AlN-EG) nanofluids

The paper presents the results of experimental studies on basic thermophysical properties of aluminum nitride nanoparticles suspensions [1]. Ethylne glycol (POCH, Avantor Performance Materials Poland, Gliwice, Poland) was used... [ view full abstract ]

The paper presents the results of experimental studies on basic thermophysical properties of aluminum nitride nanoparticles suspensions [1]. Ethylne glycol (POCH, Avantor Performance Materials Poland, Gliwice, Poland) was used as the base liquid for this nanofluids. Nanofluids were prepared with two step method with use of the commercial available AlN nanoparticles (PlasmaChem GmbH (Berlin, Germany), catalog number PL-HK-AlN) with average particle size 20 nm. Viscosity measurements were performed on HAAKE MARS 2 rheometer (Thermo Electron Corporation, Karlsruhe, Germany)
Dynamic viscosity of the material in the range of shear rates from 0.01 to 1000 s-1 at constant temperature of 298.15 K was measured. The dependence of viscosity on temperature in the range from 273.15 to 323.15 K was also examined.

To determinate thermal conductivity of AlN-EG nanofluids a KD2 Pro Thermal Properties Analyzer (Decagon Devices Inc., Pullman, Washington, USA) was used. Thermal conductivity was measured at a constant temperature of 298.15 K.

It was presented that this material exhibits non-Newtonian nature and thermal conductivity increases linearly with the concentration of nanoparticles in suspension.

[1] G. Żyła, J. Fal, Experimental studies on viscosity, thermal and electrical conductivity of aluminum nitride – ethylene glycol (AlN–EG) nanofluids, Thermochimica Acta, 637, 11–16 (2016)