Boiling/Evaporation characteristics of a droplet on a nano-particles-assembled bi-porous layer

Abstract

Droplet behavior on a nanoparticles-assembled bi-porous layer foamed onto a heating surface is evaluated in order to evaluate whether the layer works as a boiling heat transfer promoter. The nanoparticles layer foamed by a boiling adhesion method is of bi-porous structure, which consists of nano scale of pore and micro scale of pore. A life time of a single droplet on heated bi-porous layer is evaluated. It is confirmed that wetting limit temperature drastically increases compared with that of a bare surface and that the nanoparticles-assembled bi-porous layer has quite a high potential to enhance the boiling heat transfer rate and the critical heat flux.