Synthesis of stable nanofluids as efficient heat transfer fluid and exact model for thermo physical properties is the most thrust area of research in the recent years. Two-step method is used to disperse the  nanoparticles (20nm) in Mono Ethylene Glycol and water mixture (MEG/Water 50:50% by volume). To achieve stable nanofluids with different volume fraction (0.2%-0.8%) of  Ultrasonic vibrations are used for proper agitation. Their SEM images are given to see the stability and even distribution of particles in the fluid. To study the effect of nanoparticle volume fraction on thermal conductivity and viscosity, experimental investigation are performed and compared with the different theoretical models available.  The experimental correlation is developed to decide the thermal conductivity and the viscosity which is most useful to calculate heat transfer performance and pumping power in heat transfer application.

nanofluids, sonication, thermal conductivity, viscosity, theoretical models.