Pool boiling and flow boiling on micro- and nanostructured surfaces

This study reviews recent experimental investigations performed on pool and flow boiling over nano- and micro engineered structures for enhancements in boiling heat transfer, namely heat transfer coefficient (HTC) and critical heat flux (CHF). Modified surfaces having nano/micro porous features of mainly irregular shapes through anodic oxidation processes, coating of metallic and non-metallic layers, deposition of powder materials, and roughening for improving boiling heat transfer have been of research interests of many researchers. In addition, pool boiling and flow boiling studies on artificial structures, mainly fabricated on a plain surface, such as pins, pillar fins, grooves (in different shapes, i.e. rectangular, square, cylinder, etc.) for increasing the heated surface area, or cavities created on substrates for increasing bubble nucleation sites were also considered for both micro and nano scale. The results reported in recent investigations on pool boiling and flow boiling from micro/nanostructured surfaces were included, and a comprehensive overview was provided.