Effects of SiC and Graphene-Oxide Nanoparticles-Coated Surfaces on Quenching Performance

Abstract

Quenching experiments were conducted to investigate the effect of SiC and Graphene Oxide (GO) nanoparticles deposition on the heat transfer during rapid cooling in vertical tubes. Temperature histories during the quenching were measured for each test section to confirm the effect of nanoparticles-coated layer on the quenching performance. Boiling curves for each test were obtained by using inverse heat transfer method. The quenching performance was enhanced for nanoparticles-coated tubes about 15-29 % compared to bare tube. And scanning electron microscope (SEM) images of inner surfaces of tubes after experiments were acquired, and the contact angles were measured to observe the effect of surface structures and wettability on the quenching performance. In case of tubes coated with GO nanoparticles for 900 s, the enhanced quenching performance and CHF were enhanced although the contact angle increased.