Antoine Gaillard - Flow and stability of a viscoelastic liquid curtain
|Dates:||13 November 2019|
|Times:||14:00 - 15:00|
|What is it:||Seminar|
|Organiser:||Department of Mathematics|
|Who is it for:||University staff, External researchers, Current University students|
Antoine Gaillard (University of Manchester) joins us for the Physical Applied Mathematics Series, to be held in Frank Adams 1, Alan Turing Building.
Liquid curtains are sheets of liquid falling freely in ambient air at constant flow rate, generally from a slot. They are used in industry to deposit a uniform layer of liquid on solid substrates ("curtain coating" technique). The flow and the stability of these sheets has mostly been investigated in the case of Newtonian liquids. We extend knowledge to the case of viscoelastic curtains made of polymer solutions. We show that the flow is not a free-fall, i.e. liquid particles initially fall with sub-gravitational accelerations due to the strong elastic stresses arising from the stretching of polymer molecules. We also show that although hole initiation in the curtain is hampered by polymer addition, the dynamics of hole growth is not affected by elastic stresses. Besides, we report a surprising flow instability for the most shear-thinning solutions which originates from the flow contraction at the slot inlet (in the die from which liquids are extruded).
Organisation: University of Manchester
Travel and Contact Information
Frank Adams 1
Alan Turing Building