Presented by:
Manish Tiwari
Date:
Friday 6th October 2017 - 09:45 to 10:30
Venue:
INI Seminar Room 1
Abstract:
Ice
formation is commonplace in nature and manmade applications and it also
influences our lives positively and sometimes catastrophically. However, a
clear understanding of ice formation, role of substrate/surface on which it
forms are subjects of very vigorous current research. Icing in dynamic
conditions, such as freezing of a cold drop upon hitting a surface or freezing
in the presence of airflow are even less understood, despite a few novel
insights developed in the last five years. This presentation will start by
summarising some open and closed questions on ice formation on surfaces using
nucleation theory and its extensions and report on a number of experiments to
this end, which use droplet/substrate system as a model. To this end we will
discuss the role of surface nanoengineering and wettability control in
controlling the ice nucleation. Insights into design of icephobic surfaces with
exceptional ability to delay ice formation will also be shared. The role of
environmental variables such as humidity an air flow will also be discussed.
Next, for the majority of the presentation, we will consider the dynamic
problem of droplet and jet impacting on such surfaces reaching speeds up to ~30
m/s and Weber numbers >10,000. Droplet supercooling and its effect on
droplet impact dynamics will be analysed in detail. In addition, surface
morphology needs and our initial results on surface durability testing will
also be presented.
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