Latest papers in fluid mechanics

Entry of a sphere into a water-surfactant mixture and the effect of a bubble layer

Physical Review Fluids - Mon, 10/29/2018 - 10:00

Author(s): N. B. Speirs, M. M. Mansoor, R. C. Hurd, S. I. Sharker, W. G. Robinson, B. J. Williams, and T. T. Truscott

An experimental study shows that splash formation is not reduced when spheres fall into water with a layer of soap bubbles on top. Instead, the bubble layer causes entrained air cavities to form at lower impact velocities. Results also show that the surfactant causes cavity formation to become radius dependent in cases where there is no bubble layer.


[Phys. Rev. Fluids 3, 104004] Published Mon Oct 29, 2018

In-plane elasticity controls the full dynamics of red blood cells in shear flow

Physical Review Fluids - Thu, 10/25/2018 - 11:00

Author(s): Simon Mendez and Manouk Abkarian

Red blood cells are modeled by an axisymmetric ellipsoid of fixed shape with internal circulation in shear flow without inertia. When accounting for membrane in-plane elasticity the model predicts the expected behaviors of flipping with orbit selection, rolling, frisbeeing, kayaking, and swinging.


[Phys. Rev. Fluids 3, 101101(R)] Published Thu Oct 25, 2018

Numerical simulations of a rising drop with shape oscillations in the presence of surfactants

Physical Review Fluids - Thu, 10/25/2018 - 11:00

Author(s): Antoine Piedfert, Benjamin Lalanne, Olivier Masbernat, and Frédéric Risso

Shape-oscillating droplets rising in a liquid are simulated with insoluble surfactants adsorbed at their interface. Conditions are reported in which the average surface tension gradient induces a significant decrease of the rise velocity but does not impact the oscillation dynamics.


[Phys. Rev. Fluids 3, 103605] Published Thu Oct 25, 2018

Large-eddy simulations of turbulent thermal convection using renormalized viscosity and thermal diffusivity

Physical Review E - Wed, 10/24/2018 - 11:00

Author(s): Sumit Vashishtha, Mahendra K. Verma, and Roshan Samuel

In this paper we employ renormalized viscosity and thermal diffusivity to construct a subgrid-scale model for large eddy simulation (LES) of turbulent thermal convection. For LES, we add νren∝Πu1/3(π/Δ)−4/3 to the kinematic viscosity; here Πu is the turbulent kinetic energy flux, and Δ is the grid s...


[Phys. Rev. E 98, 043109] Published Wed Oct 24, 2018

Electrodeformation of vesicles suspended in a liquid medium

Physical Review Fluids - Wed, 10/24/2018 - 11:00

Author(s): Adnan Morshed, Prashanta Dutta, Mohammad Robiul Hossan, and Robert Dillon

The electrodeformation of a bio-vesicle suspended in liquid media depends on the conductivity ratio of fluid and vesicle, applied electric field, membrane capacitive charging, and vesicle initial shape. Our theoretical study provides important insights on this complex fluid-structure interaction.


[Phys. Rev. Fluids 3, 103702] Published Wed Oct 24, 2018

Force on a compressible sphere and the resonance of a bubble in standing surface acoustic waves

Physical Review E - Tue, 10/23/2018 - 11:00

Author(s): Shen Liang, Wang Chaohui, and Hu Qiao

In this paper, the theory for acoustic radiation force exerted by standing surface acoustic waves (SSAWs) is extended to a compressible sphere in inviscid fluids. The conventional theory, developed in plane standing waves, fails to predict the radiation force incident on particles in the SSAW. Our e...


[Phys. Rev. E 98, 043108] Published Tue Oct 23, 2018

Stokes' second problem and reduction of inertia in active fluids

Physical Review Fluids - Mon, 10/22/2018 - 11:00

Author(s): Jonasz Słomka, Alex Townsend, and Jörn Dunkel

Simulations predict that a pendulum immersed in an active fluid oscillates faster than in a passive fluid due to a reduction of the fluid inertia. The decrease in inertia is mediated by topological defects in the stress field, which can effectively decouple the bulk flow dynamics from the pendulum.


[Phys. Rev. Fluids 3, 103304] Published Mon Oct 22, 2018

Beyond the coffee-ring effect: Pattern formation by wetting and spreading of drops

Physical Review E - Fri, 10/19/2018 - 11:00

Author(s): Dileep Mampallil, Meenakshi Sharma, Ashwini Sen, and Shubham Sinha

Drying of colloidal drops on solid surfaces is the widely known method to form self-assembled patterns. The underlying principle of this method is the phenomenon known as the coffee-ring effect. Here, we report a phenomenon of pattern formation involving not drying but conversely wetting and spreadi...


[Phys. Rev. E 98, 043107] Published Fri Oct 19, 2018

Jump-to-contact instability: The nanoscale mechanism of droplet coalescence in air

Physical Review Fluids - Fri, 10/19/2018 - 11:00

Author(s): Véronique Chireux, Matthieu Protat, Frédéric Risso, Thierry Ondarçuhu, and Philippe Tordjeman

Atomic Force Microscope observations find that two drops of radii 0.7 to 70 micrometers jump to contact when separated by a distance that scales as (HReq/γ)1/3 for small drops and as (H/γ)1/2 for larger drops.


[Phys. Rev. Fluids 3, 102001(R)] Published Fri Oct 19, 2018

Electrokinetics of a particle attached to a fluid interface: Electrophoretic mobility and interfacial deformation

Physical Review Fluids - Fri, 10/19/2018 - 11:00

Author(s): Michael Eigenbrod, Florian Bihler, and Steffen Hardt

The electrophoretic mobility of a particle at the interface between two fluids is computed. For thin Debye layers, the Smoluchowki mobility is recovered. Generally, the mobility depends on the contact angle between the fluids and the particle. The interfacial deformation is also calculated.


[Phys. Rev. Fluids 3, 103701] Published Fri Oct 19, 2018

Plastron morphology and drag of a superhydrophobic surface in turbulent regime

Physical Review Fluids - Thu, 10/18/2018 - 11:00

Author(s): D. Reholon and S. Ghaemi

We perform drag force and particle tracking velocimetry measurements on a body-of-revolution coated with a superhydrophobic layer for Re between 5×105 and 1.5×106. As Re increases, drag reduction decreases, and a full plastron becomes isolated air bubbles as thin menisci.


[Phys. Rev. Fluids 3, 104003] Published Thu Oct 18, 2018

Helicity in superfluids: Existence and the classical limit

Physical Review Fluids - Thu, 10/18/2018 - 11:00

Author(s): Hridesh Kedia, Dustin Kleckner, Martin W. Scheeler, and William T. M. Irvine

The analog of hydrodynamic helicity in superfluids is zero for all flows. A semiclassical limit is found in the link and writhe of bundles of superfluid vortices. Numerical simulations show that the dynamics of semiclassical helicity closely resemble those seen in experiments in viscous fluids.


[Phys. Rev. Fluids 3, 104702] Published Thu Oct 18, 2018

Editorial: Introduction to the 35th Annual Gallery of Fluid Motion (Denver, Colorado, USA, 2017)

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Nicole S. Sharp and Patrick D. Weidman

[Phys. Rev. Fluids 3, 100001] Published Wed Oct 17, 2018

Marangoni bursting: Evaporation-induced emulsification of a two-component droplet

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Guillaume Durey, Hoon Kwon, Quentin Magdelaine, Mathias Casiulis, Julien Mazet, Ludovic Keiser, Hadrien Bense, Pierre Colinet, José Bico, and Etienne Reyssat

This paper is associated with a video winner of a 2017 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0020



[Phys. Rev. Fluids 3, 100501] Published Wed Oct 17, 2018

Symmetry breaking in Leidenfrost flows

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Ambre Bouillant, Timothée Mouterde, Philippe Bourrianne, Christophe Clanet, and David Quéré

This paper is associated with a video winner of a 2017 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0052



[Phys. Rev. Fluids 3, 100502] Published Wed Oct 17, 2018

Kicked drops

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Pierre Chantelot, Martin Coux, Lucie Domino, Benoît Pype, Christophe Clanet, Antonin Eddi, and David Quéré

This paper is associated with a video winner of a 2017 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0080



[Phys. Rev. Fluids 3, 100503] Published Wed Oct 17, 2018

Fluted films

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): N. B. Speirs, M. M. Mansoor, J. Belden, R. C. Hurd, Z. Pan, and T. T. Truscott

This paper is associated with a poster winner of a 2017 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.P0030



[Phys. Rev. Fluids 3, 100504] Published Wed Oct 17, 2018

Mandala-inspired representation of the turbulent energy cascade

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Maxime Bassenne, Hyunji Jane Bae, and Adrián Lozano-Durán

This paper is associated with a poster winner of a 2017 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.P0026



[Phys. Rev. Fluids 3, 100505] Published Wed Oct 17, 2018

Solid structures generated by capillary instability in thin liquid films

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): J. Marthelot, E. F. Strong, P. M. Reis, and P.-T. Brun

This paper is associated with a poster winner of a 2017 APS/DFD Milton van Dyke Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.P0018



[Phys. Rev. Fluids 3, 100506] Published Wed Oct 17, 2018

Soap opera in the maze: Geometry matters in Marangoni flows

Physical Review Fluids - Wed, 10/17/2018 - 11:00

Author(s): Fernando Temprano-Coleto, François J. Peaudecerf, Julien R. Landel, Frédéric Gibou, and Paolo Luzzatto-Fegiz

This paper is associated with a video winner of a 2017 APS/DFD Gallery of Fluid Motion Award. The original video is available from the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2017.GFM.V0098



[Phys. Rev. Fluids 3, 100507] Published Wed Oct 17, 2018

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