@article{lee_dalnoki-veress_2024, title={Buckling instability in a chain of sticky bubbles}, volume={6}, ISSN={["2643-1564"]}, url={https://doi.org/10.1103/PhysRevResearch.6.L022062}, DOI={10.1103/PhysRevResearch.6.L022062}, abstractNote={A slender object undergoing an axial compression will buckle to alleviate the stress. Typically the morphology of the deformed object depends on the bending stiffness for solids, or the viscoelastic properties for liquid threads. We study a chain of uniform sticky air bubbles that rise due to buoyancy through an aqueous bath. A buckling instability of the bubble chain with a characteristic wavelength is observed. If a chain of bubbles is produced faster than it is able to rise, the dominance of viscous drag over buoyancy results in a compressive stress that is alleviated by buckling the bubble chain. Using low Reynolds-number hydrodynamics, we predict the critical buckling speed, the terminal speed of a buckled chain, and the geometry of the buckles. Published by the American Physical Society 2024}, number={2}, journal={PHYSICAL REVIEW RESEARCH}, author={Lee, Carmen L. and Dalnoki-Veress, Kari}, year={2024}, month={Jun} }
 @article{lee_chan_carlson_dalnoki-veress_2022, title={Multiple droplets on a conical fiber: formation, motion, and droplet mergers}, volume={18}, url={http://dx.doi.org/10.1039/d1sm01462e}, DOI={10.1039/d1sm01462e}, abstractNote={Small droplets on slender conical fibers spontaneously move along the fiber due to capillary action.}, number={7}, journal={Soft Matter}, publisher={Royal Society of Chemistry (RSC)}, author={Lee, Carmen L. and Chan, Tak Shing and Carlson, Andreas and Dalnoki-Veress, Kari}, year={2022}, pages={1364–1370} }
 @article{doering_drawert_lee_pruitt_petzold_dalnoki-veress_2022, title={Noise resistant synchronization and collective rhythm switching in a model of animal group locomotion}, volume={9}, url={http://dx.doi.org/10.1098/rsos.211908}, DOI={10.1098/rsos.211908}, abstractNote={
            Biology is suffused with rhythmic behaviour, and interacting biological oscillators often synchronize their rhythms with one another. Colonies of some ant species are able to synchronize their activity to fall into coherent bursts, but models of this phenomenon have neglected the potential effects of intrinsic noise and interspecific differences in individual-level behaviour. We investigated the individual and collective activity patterns of two
            Leptothorax
            ant species. We show that in one species (
            Leptothorax
            sp. W), ants converge onto rhythmic cycles of synchronized collective activity with a period of about 20 min. A second species (
            Leptothorax crassipilis
            ) exhibits more complex collective dynamics, where dominant collective cycle periods range from 16 min to 2.8 h. Recordings that last 35 h reveal that, in both species, the same colony can exhibit multiple oscillation frequencies. We observe that workers of both species can be stimulated by nest-mates to become active after a refractory resting period, but the durations of refractory periods differ between the species and can be highly variable. We model the emergence of synchronized rhythms using an agent-based model informed by our empirical data. This simple model successfully generates synchronized group oscillations despite the addition of noise to ants' refractory periods. We also find that adding noise reduces the likelihood that the model will spontaneously switch between distinct collective cycle frequencies.
          }, number={3}, journal={Royal Society Open Science}, publisher={The Royal Society}, author={Doering, Grant Navid and Drawert, Brian and Lee, Carmen and Pruitt, Jonathan and Petzold, Linda R. and Dalnoki-Veress, Kari}, year={2022}, month={Mar} }
 @article{bertin_lee_salez_raphaël_dalnoki-veress_2021, title={Capillary levelling of immiscible bilayer films}, url={https://doi.org/10.1017/jfm.2020.1045}, DOI={10.1017/jfm.2020.1045}, abstractNote={Abstract}, journal={Journal of Fluid Mechanics}, author={Bertin, Vincent and Lee, Carmen L. and Salez, Thomas and Raphaël, Elie and Dalnoki-Veress, Kari}, year={2021}, month={Mar} }
 @article{fournier_lee_schulman_raphaël_dalnoki-veress_2021, title={Droplet migration on conical fibers}, volume={44}, url={http://dx.doi.org/10.1140/epje/s10189-021-00014-z}, DOI={10.1140/epje/s10189-021-00014-z}, abstractNote={The spontaneous migration of droplets on conical fibers is studied experimentally by depositing silicone oil droplets onto conical glass fibers. Their motion is recorded using optical microscopy and analyzed to extract the relevant geometrical parameters of the system. The speed of the droplet can be predicted as a function of geometry and the fluid properties using a simple theoretical model, which balances viscous dissipation against the surface tension driving force. The experimental data are found to be in good agreement with the model.}, number={2}, journal={The European Physical Journal E}, publisher={Springer Science and Business Media LLC}, author={Fournier, Clementine and Lee, Carmen L. and Schulman, Rafael D. and Raphaël, Élie and Dalnoki-Veress, Kari}, year={2021}, month={Feb} }
 @article{chan_lee_pedersen_dalnoki-veress_carlson_2021, title={Film coating by directional droplet spreading on fibers}, volume={6}, url={https://doi.org/10.1103/PhysRevFluids.6.014004}, DOI={10.1103/PhysRevFluids.6.014004}, abstractNote={Plants and insects use slender conical structures to transport and collect small droplets, which are propelled along the conical structures due to capillary action. These droplets can deposit a fluid film during their motion, but despite its importance to many biological systems and industrial applications the properties of the deposited film are unknown. We characterise the film deposition by developing an asymptotic analysis together with experimental measurements and numerical simulations based on the lubrication equation. We show that the deposited film thickness depends significantly on both the fiber radius and the droplet size, highlighting that the coating is affected by finite size effects relevant to film deposition on fibres of any slender geometry. We demonstrate that by changing the droplet size, while the mean fiber radius and the Capillary number are fixed, the thickness of the deposited film can change by an order of magnitude or more. We show that self-propelled droplets have significant potential to create passively coated structures.}, number={1}, journal={Physical Review Fluids}, publisher={American Physical Society (APS)}, author={Chan, Tak Shing and Lee, Carmen L. and Pedersen, Christian and Dalnoki-Veress, Kari and Carlson, Andreas}, year={2021}, month={Jan} }