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

Abstract

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 55.25 nm. To study critical heat flux enhancement using ZnO nanofluid, different weight concentration of nanofluid are prepared. It is observed that maximum enhancement is 47.16% for 1.5 wt.% 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 scanning electron microscopy, is the source to enhance critical heat flux.