Providing a model for Csf according to pool boiling convection heat transfer of water/ferrous oxide nanofluid using sensitivity analysis

Abstract

Purpose A boiling surface with different initial roughness and under various nanoparticles volume fractions was studied in present work. Design/methodology/approach Develop a correlation and sensitivity analysis. Findings The results showed that for small (7.3 nm) and much larger (about 2,000 nm) surface roughness, compared to nanoparticle size of around 25 nm, the heat transfer rate of nanofluid diminishes relative to that of base fluid. The results also demonstrated that the boiling heat transfer rate is reduced by increasing the concentration of nanoparticles. For larger boiling surface roughness (480 nm) and nanoparticles volume fractions of less than 0.1 Vol.%, the value of heat transfer increases with the increase of nanoparticles concentration; and for those of more than 0.1 Vol.%, heat transfer rate decreases by adding more nanoparticles, significantly. Originality/value Finally, an equation was presented for estimating the wall superheat and the Csf coefficient in terms of mentioned parameters.