[Soft-matter] Soft Matter and Stat Phys Seminar on 25 Mar 2022 [online]

[Maciej Lisicki]

Dear Soft Matter Colleagues and Friends,

On Friday 25 March 2022 at 9:30AM we are hosting a seminar during which

Endre Joachim Mossige (Norwegian University of Life Sciences NMBU, Norway)

will give a talk

Balloon drops and other shapes with miscible kitchen fluids

Abstract
The kitchen is a hub of fluid mechanics where drops play a prominent role: the coffee ring effect, the transition from jetting to dripping in a tap, and the mesmerizing display of soap films during dish washing are everyday examples. These flows concern immiscible fluids and are well studied due to their omnipresence in technical situations such as inkjet printing and microfluidic encapsulation; however, transport problems involving miscible fluids have enjoyed far less attention, which is surprising given their rich dynamics. A canonical mixing problem from the kitchen concerns the sweetening of tea with honey, and we have previously shown (Walls et al., JFM, 2018) that sessile drops form miscible “skirts” due to free convection, and we report a remarkable jetting phenomenon for pendant drops. In this talk, we invert the fluids and look at freely suspended water drops rising through more dense, more viscous miscible liquids (Mossige et al., Phys. Fluids, 2021). We track the shape of these balloon shaped drops, as well as their velocities and volumes, and use a simple scaling relation to rationalize our findings. Our experiments make use of edible ingredients such as water, corn syrup and food coloring, and can be performed at home with simple kitchen tools and a cell phone camera. These types of kitchen flow experiments are vehicles for accessible and affordable science education and are hotspots for curiosity-driven research (Mathijssen, Lisicki, Prakash, Mossige, arxiv.org/abs/2201.12128 <http://arxiv.org/abs/2201.12128>, 2022).

Attached is also a visual representation for the seminar contents.

The seminar will be conducted on Zoom
https://us02web.zoom.us/j/82784273907 <https://us02web.zoom.us/j/82784273907>
and will begin at 9:30AM. 

For future talks, we will most likely be back to stationary (in person) seminars in April.

Maria Ekiel-Jeżewska
Maciej Lisicki
Piotr Szymczak
Panagiotis Theodorakis 



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