The Study of Stability and Volumetric Properties for ZrO2 Nanoparticles Dispersed in Polypropylene Glycol (PPG) and Aqueous solutions of PPG

Nanofluids are a mixture of particles with sizes of 1-100 nm in a fluid phase [1], containingof water, ethylene glycol, polyethylene glycol, polypropylene glycol and light oils.Nanoparticles, nanofibers, nanotubes and nanorods have been used in preparation of nanofluids[2]. Nanofluids have specific aspects that distinguish them from two phase fluid mixture withmicro or millimeter particles [3]. The most important thermophysical properties in nanofluids areviscosity and density. Lots of researches have been done in this field and it still needs moreattention [4]. In this work the nanoparticles of ZrO2 have been dispersed in polypropylene glycol(PPG) and aqueous solutions of PPG and stability of these nanofluids has been verified with UVvisspectroscopy. The density, speed of sound and viscosity values for stable nanofluid have beenmeasured at (293.15, 298.15, 308.15 and 318.15) K. From these experimental data, the excessmolar volume, VmE, and isentropic compressibility, κs, have been determined. The behaviour ofthese values with temperature and concentration has been interpreted for studying the dispersionof ZrO2 nanoparticles in base fluid. The VmE values were fitted to the Redlish-Kister, Ott- et al.,and polynomial equations. The isentropic compressibility values were correlated with thepolynomial equation. The Eyring-NRTL and Eyring-mNRF models have successfully been usedfor correlating the viscosity values of the stable nanofluid with temperature dependencyconsidered. This study’s aim is to get the most stable Nanofluids with polymers and investigatethe volumetric and viscosity oroperties of these Nanofluids.

کلیدواژه ها:

Nanofluid ، ZrO2 Nanoparticle ، Polypropylene glycol ، Excess molar volume ، Viscosity