A great video I saw on the web was one on the Marangoni effect posted by American Physical Society, which appears to be made by Duret et al. (cited below) and based a paper by Keiser et al. (2017). This visual involves a mixture of water, dye, and isopropyl alcohol dropped onto an oil bath.
I like the way that a clear and near-perfectly circular border develops on the outside. It’s visually interesting that the droplets become smaller and more deep blue around the edge, likely due to evaporation of the isopropyl alcohol. The “fingers” spreading out from the mother drop are quite striking while the mother drop decreases in diameter. It creates a mesmerizing dynamic pattern that almost resembles some kind of biological process. I liked the buildup of showing what happens when it was just water and just alcohol, and then the two mixed together. I like the exploration of different alcohol concentrations speed of the bursting and size of the droplets. The use of different camera angles and zooms was effective to show the nuances of the effect and to be visually engaging. I appreciated the brief explanation of the science behind it, discussing the differences in surface tension and alcohol evaporation leading to this phenomenon.
Video Contributors (DOI: https://doi.org/10.1103/APS.DFD.2017.GFM.V0020):
Guillaume Durey, The Lutetium Project, ESPCI Paris, PSL Research University, Paris, France
Hoon Kwon, The Lutetium Project, ESPCI Paris, PSL Research University, Paris, France
Quentin Magdelaine, The Lutetium Project, ESPCI Paris, PSL Research University, Paris, France
Mathias Casiulis, The Lutetium Project, ESPCI Paris, PSL Research University, Paris, France
Julien Mazet, Conservatoire National Supérieur de Musique et de Danse de la Ville de Paris, PSL Research University, Paris, France
Ludovic Keiser, PMMH, ESPCI Paris, PSL Research University, Paris, France
Hadrien Bense, PMMH, ESPCI Paris, PSL Research University, Paris, France
José Bico, PMMH, ESPCI Paris, PSL Research University, Paris, France
Pierre Colinet, Université Libre de Bruxelles, TIPs (Transfers, Interfaces and Processes), Brussels, Belgium
Etienne Reyssat, PMMH, ESPCI Paris, PSL Research University, Paris, France
Original paper reference:
L. Keiser, H. Bense, P. Colinet, J. Bico, and E. Reyssat. Marangoni Bursting: Evaporation-Induced Emulsification
of Binary Mixtures on a Liquid Layer. Physical Review Letters 118, 074504 (2017). DOI: 10.1103/PhysRevLett.118.074504.
(Note that appending the text at the end of the link did not work for this video)