Abstract
Experiments were performed using visual and PIV techniques in order to study the appearance of a negative wake as well as its influence upon the deformation and breakup of droplets rising in viscoelastic fluids. In this report, Newtonian and viscoelastic drops were injected through different viscoelastic fluids; the deformation of the droplets was then followed and analyzed. In the case of Newtonian drops traveling through a viscoelastic fluid, a tail appears which later breaks into satellite droplets; a negative wake is present on the sides of the tail. The viscoelastic drops also exhibit a tail which is more resistant to rupture and the negative wake appears after the tail; additionally, a bump appears at the tip of the tail which enhances its elongation and determines the onset of breakup.
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Acknowledgements
The authors would like to thank CONACYT for Fernando Carol’s support during his studies. Also, we acknowledge support from UNAM grants PAPIIT IN 106512, IT106018 and IT100218. D. Samayoa wishes to thank the Instituto Politécnico Nacional for the financial support during his sabbatical year at UNAM and B.Mena thanks support from PASPA program (DGAPA) during a sabbatical leave at the University of Seville.
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Carril-Naranjo, F., Mena, B., Samayoa, D. et al. The influence of the negative wake on the deformation and breakup of viscoelastic droplets. Korea-Aust. Rheol. J. 33, 283–291 (2021). https://doi.org/10.1007/s13367-021-0022-0
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DOI: https://doi.org/10.1007/s13367-021-0022-0