Nanotechnology & Expo

Biography

Biography: Waqar Ahmed

Abstract

Since the last few ages, several studies have been conducted on nanofluids research containing metal oxides; Graphene, carbon-based, and their composites/hybrid are rapidly growing for energy improvements. Conventional fluids like water, DW, EG, PEG, Palm oil, Glycerin, and Transformer oil have limited thermal and heat transfer properties, so there is a need for some alternative heat exchanging liquids. The prime aim to write this comprehensive article is to synthesize nanoparticles, nanofluids preparation, and detailed applications in different aspects with enhanced thermophysical properties. Different nanoparticles were synthesized using varying synthesis techniques likes (Sonochemical, Precipitation, Sol-Gel, Hydrothermal, and green functionalization, and then a 2-step method was used to prepare nanofluids. Nanofluids proved their enhanced heat transfer properties as compared to conventional fluids, including their enhanced thermal and rheological characteristics.  The improvement in thermophysical and thermal properties of Metal oxides, Ceramics, Graphene oxide, and Carbon nanotubes based on single and hybrid nanofluids was reported here. The 0.025%, 0.05%, 0.075%, 0.1%, 1%, 2% and 3% weight concentrations of the solid nanoparticles dispersed in base fluids showed improved thermophysical and heat transfer properties. A significant improvement in thermal conductivity was found at 49%, 43.7%, 41%, 37.2%, 27%, and 17% at higher wt.% concentrations for the metal oxide-based nanofluids. Similarly, the higher heat transfer improvement was reported up to 89%, 82% and 72%, 69%, and 57% at higher wt.% concentration for Graphene and CNTs-based nanofluids. This review also covers the stability and dispersion to see the longer suspension of the particles in the base fluid, the graphene oxide, and CNTs-based nanofluids exhibit longer suspension up to 10 weeks after the preparation.