Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J18: Complex Surfaces and Drops
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 146A
Chair: Günter Auernhammer, Leibniz Institute of Polymer Research Dresden
Abstract: J18.00002 : Spreading of drops exhibiting complex rheology*
4:48 PM–5:01 PM
Presenter:
Günter K Auernhammer
(Leibniz Institute of Polymer Research Dresden)
Authors:
Günter K Auernhammer
(Leibniz Institute of Polymer Research Dresden)
Peyman Rostami
(Leibniz Institute of Polymer Research Dresden)
Valentine Comoy
(Leibniz Institute of Polymer Research Dresden)
Reza Azizmalayeri
(Leibniz Institute of Polymer Research Dresden)
As shear thickening systems, we study the spreading behaviour of suspensions on clean hydrophilic glass surfaces, with increasing particle mass fractions (Φ = 0.3 to 0.65) and varying particle diameter (d = 10 to 20 μm), chemistry and morphology. Depending on the particle mass fraction, being close or not to the jamming transition of the suspension, two outcomes were observed: the spreading curve either exhibited a spreading behaviour qualitatively similar to the one of the Newtonian carrier liquid, with two spreading regimes or a spreading behaviour diverging from the reference, with three spreading regimes and an increase in spreading rate in-between two. The different spreading behavior strongly correlates with an increasing shear thickening of the suspensions. The correlation between rheological behavior and spreading dynamics is general for all investigates particle types. Shear thinning polymer solution also exhibit strong correlation of the spreading dynamics with the rheological properties of the solutions, like the shear rate at the end of the Newtonian plateau or the exponent in an assumed power law model. In both examples the relation of the time scale of the experiment and the intrinsic relaxation time of the sample is relevant and will be discussed.
In both cases, we relate the observed correlations between rheological behaviour and spreading dynamics of drops to the dissipative mechanisms close to the moving contact line of the drop.
*This study was funded by the Deutsche Forschungsgemeinschaft Project No. 265191195–SFB 1194, "Interaction between Transport and Wetting Processes" and Project Nos. A02 and A06
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