Jet Impingement Heat Transfer Enhancement with Hybrid Nanofluids

Abstract

In past few decades, use of advanced technologies shows exponential growth in newlinevarious fields like electronics, power generation, and manufacturing in which heat newlinetransfer is an integral part of the process. This unprecedented growth demands newlineminiaturization, improved operating and storage capacities of the thermal devices, newlinewhich in turn seeks for a new revolution in cooling technologies. Impinging jets are newlinefrequently used in various industrial applications for cooling purposes. But this cooling newlineprocess limits the use of working fluids. In this regard, Present research reports newlineexperimental investigations pertaining to heat transfer behavior of hot surfaces during newlinefree surface jet impingement by using water and hybrid nanofluids. Initially, for the newlinepreparation of the hybrid nanofluid, the Ag/ZnO hybrid nanoparticles were synthesized newlineby the chemical precursor method and characterized with SEM, TEM, and XRD newlineanalysis. The prepared nanofluid is characterized for thermal conductivity, viscosity newlinewhich showed considerable enhancements as compared with conventional fluid. An newlineexperimental setup has been developed to analyze the heat transfer characteristics of newlineimpinging free surface jet (ID = 2.8 mm) on a horizontal hot copper surface (diameter newline90 mm and thickness 3 mm). The heat transfer characteristic of impinging hybrid newlinenanofluid jet is analyzed over a varied range of Reynolds numbers (1769 - 9421), newlinenanofluid volume concentration, H/D ratio (2-7.5), and angle of impingement. A set of newlineexperiments were performed to calculate heat transfer coefficient, cooling and boiling newlineperformance.