The enhancement of critical heat flux and heat transfer coefficient during nucleate boiling is crucial to the thermal management communities for the potential widespread impact of scientific breakthroughs on advanced cooling technologies and other applications. Since the early 1990s, nanofluids (i.e., functional liquid suspension containing particles smaller than 100 nm) have been proposed as a technique for the enhancement of nucleate boiling.
Unfortunately, years of published results on this topic have only led to contradictory results regarding the enhancement or deterioration of performance during nanofluid boiling. To date, nanofluids have not led to any practical or implementable boiling enhancements solutions owing to the primary drawback that the nanoparticles tend to settle out of suspension over time.
Let’s change the viewpoint for a moment: while nanoparticle deposition during boiling has stopped any possible application of nanofluids, on the same time, it has opened new research opportunities introducing a new concept of surface functionalization using a low-cost, easy-to-implement deposition technique.
On the basis of the selected nanoparticle and base fluid combination, this new deposition technique might be applied to realize controlled and stable coatings for many different applications not limited to heat transfer ones, such as anti-fouling and self-cleaning, anti-bacterial, anti-icing, anti-corrosion, etc. to be implemented in many different fields: advanced heat transfer, biomedical, oil and gas industry, aeronautical, etc.
This seminar will present the influence of nanofluids on boiling heat transfer and related research activities on surface functionalization via nanoparticle deposition through nanofluid boiling tests carried out at the Nano Heat Transfer Lab (NHT-Lab) of the University of Padova.