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Author(s): John Kim and Gary Leal [Phys. Rev. Fluids 6, 010001] Published Thu Jan 21, 2021

Author(s): Karl Cardin, Sheng Wang, Olivier Desjardins, and Mark Weislogel The rebound of large water jets from a superhydrophobic substrate in the low-gravity environment of a drop tower is investigated. A regime map is constructed from drop tower test data. Scaling laws and simulations are used to identify boundaries between jet rebound regimes and to predict landing flow geometry. [Phys. Rev. Fluids 6, 014003] Published Wed Jan 20, 2021

Author(s): Tak Shing Chan, Carmen L. Lee, Christian Pedersen, Kari Dalnoki-Veress, and Andreas Carlson Plants and insects use slender conical structures to transport and collect small droplets that are propelled along conical structures by capillary action. It is shown that these droplets can deposit a film with a thickness that depends on the fiber’s radius and the droplet size, highlighting that the coating is affected by finite size effects...

Author(s): Mathis Poujol, Régis Wunenburger, François Ollivier, Arnaud Antkowiak, and Juliette Pierre An experimental study focuses on the airborne sound generated during bubble bursting at the surface of a liquid bath. It is found that the acoustic frequency drifts and increases, consistent with a Helmholtz-type resonance of the cavity being more and more opened as the thin film in the air retracts. As an extension, a simple model based on a...

Author(s): Xi Chen, Jie Yao, and Fazle Hussain A new framework analyzes energy flux in turbulent channels under various controls, enabling estimations of drag reduction and net power saving, and also suggesting a perspective of composite control for future exploration. [Phys. Rev. Fluids 6, 013902] Published Tue Jan 19, 2021

Author(s): Subham Ghosh and Banibrata Mukhopadhyay The problem of the origin of turbulence, and hence, transport of angular momentum, in accretion flows (particularly cold flows) as well as laboratory flows like plane Couette flow, prevails due to their stability under linear perturbation. We attempt to resolve this long-standing issue with linear analysis by considering an extra stochastic force with a nonzero mean (m). We show that these flows...

Author(s): Alexander B. Mikishev and Alexander A. Nepomnyashchy Pattern selection in oscillatory long-wave Marangoni convection in a heated thin layer of liquid with weak heat flux from the free surface is investigated. The research is performed under the assumption that the surface tension of the liquid nonlinearly depends on the temperature. The pattern selection is analyzed for square, rhombic, and hexagonal planforms. [Phys. Rev. Fluids...