Enhancement of Nucleate Pool Boiling Heat Transfer on Silicon Oxide Thin Film Surface

In this paper is aimed to study the augmentation of pool boiling heat transfer characteristics of different surfaces with water, experimentally at atmospheric pressure. There were four surfaces used, viz. untreated (Plain), treated by emery grateno. 2000 and treated with silicon oxide (SiOx) TF surfaces having nano-layer thickness of 100, and 200 nm. The thin film nanocoating was prepared by e-beam evaporation Systems. The surfaces were characterized with respect to contact angle, film thickness and surface roughness. After analyzing the data, it was found that thin film surface is superior to the treated and plain surface in view of boiling heat transfer coefficient. The result found that a maximum of 45.6%, 36.8%, and 10.5% enhancement in heat transfer co-efficient was observed for SiOx TF (200 nm), SiOx TF (100 nm), and treated surfaces respectively compared to plain surface at lower heat flux. Highest enhancement of heat transfer coefficient in thin film surfaces was due to capillary effect, better liquid spreading and high density active nucleate site.