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The main focus of the present work is to characterize the ZnO nanoparticles  further to prepare the ZnO nanofluid with base fluid as deionised water and  to investigate enhancement in critical heat flux at different weight  concentrations of nanofluids. The size of nanoparticles is found to be  55.25nm. To study Critical Heat Flux (CHF) enhancement using ZnO nanofluid,  different weight concentration of nanofluid are prepared. It is observed  that maximum enhancement 47.16 percent observed for 1.5 weight percent of  ZnO nanofluid. Surface roughness and scanning electron microscopy of heater  surface is carried out for all weight concentrations of nanofluid, which  shows increase in Ra value up to some extent then it decreases and porosity  on the surface of heater observed in SEM, is the source to enhance CHF.

Charicterization and investigation of heat transfer enhancement in pool boiling with water-ZnO nanofluid