Stability analysis of heat transfer hybrid/water nanofluids

Now a days cooling system faces very big challenge in order to meet out the cooling demand due to advanced technology. At the same time, the traditional cooling or heat transfer fluids exhausted their cooling capacity. The new heat transfer fluids have been developed to overcome this hurdle. The new heat transfer fluids is called as nanofluids, nanofluid is the dispersion of nanoparticle into base fluid. The new generation of heat transfer fluids for various industrial applications like Chemical processing industries, Power stations, Nuclear reactors, Transportation industries, Electronic industries and (Heating, Ventilation and Air Conditioning) HVAC face challenge in meeting out the cooling demand for the past decades. Instability is a common problem associated with nanofluids, the recent progress on the study of nanofluids, such as, the evaluation methods for the stability of nanofluids. In this experimental investigation, stability of Al2O3-Sio(2)/water hybrid nanofluid, are studied. The Al2O3-Sio(2)/water based nanofluid at 0.2 wt%, 0.4 wt% and 0.6 wt% particle weight concentration have been prepared by using two step method. The prepared nanofluids were characterized by UV-Vis Spectrophotometer, Zeta potential analysis and Photograph capturing techniques for analyzing the stability of nanofluids. It is found that the 0.2 wt% nanofluid possesses very poor stability, 0.4 wt% has moderate stability and 0.6 wt% nanofluids has comparatively good stability even after one month duration in static condition by the three techniques for stability analysis. (C) 2019 Elsevier Ltd. All rights reserved.