Nanofluids- a new class of heat transfer fluids have recently been a very attractive area of research due to their
fascinating thermophysical properties and numerous potential benefits and applications in many important fields. However,
there are many controversies and inconsistencies in reported arguments and experimental results on various thermal
characteristics such as effective thermal conductivity, convective heat transfer coefficient and boiling heat transfer rate of
nanofluids. As of today, researchers have mostly focused on anomalous thermal conductivity of nanofluids. Although investigations
on boiling and droplet spreading are very important for practical application of nanofluids as advanced coolants,
considerably fewer efforts have been made on these thermal features of nanofluids. In this paper, recent research and
development in boiling heat transfer and droplet spreading of nanofluids are reviewed together with summarizing most related
patents on nanofluids published in literature. Review reveals that despite some inconsistent results nanofluids exhibit
significantly higher boiling heat transfer performance compared to their base fluids and show great promises to be used as
advanced heat transfer fluids in numerous applications. However, there is a clear lack of in-depth understanding of heat
transport mechanisms during phase change of nanofluids. It is also found that the nanofluids related patents are limited
and among them most of the patents are based on thermal conductivity enhancement and synthesising processes of specific
type of nanofluids.
Keywords: Boiling heat transfer, critical heat flux, droplet spreading, nanoparticle concentration, nanofluids, super heat.
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