Boiling/evaporation characteristics of a water droplet on nanoparticles-accumulated bi-porous layers produced by boiling adhesion method are evaluated. In the boiling adhesion method, the bi-porous layer is coated by dropping or spraying nanoparticles-contained solution on a heated metal substrate. By this method, it is possible to produce nanoscale of pore layer formed by accumulating the nanoparticles that have high wettability and microscale of pores formed by boiling bubbles blowing through the layer that work as vapor discharging. Visualization experiments with a high speed camera clarify that the boiling/evaporation performance is improved on the nanoparticles bi-porous layer and also a wetting limit temperature drastically increases. Furthermore, there are many cases where the life time of the droplet shortens even in a low superheated temperature regime. These results suggest that the nanoparticles bi-porous layer would contribute not only to boiling heat transfer enhancement but also to the increase in the critical heat flux.

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