Latest papers in fluid mechanics

Predicting transition ranges to fully turbulent viscous boundary layers in low Prandtl number convection flows

Physical Review Fluids - Wed, 12/06/2017 - 10:00

Author(s): Janet D. Scheel and Jörg Schumacher

Characteristic properties of turbulent Rayleigh-Bénard convection in the bulk and the boundary layers are summarized for a wide range of Rayleigh and Prandtl numbers, with a specific emphasis on low-Prandtl-number convection.

[Phys. Rev. Fluids 2, 123501] Published Wed Dec 06, 2017

Effect of shear thinning on superhydrophobic slip: Perturbative corrections to the effective slip length

Physical Review Fluids - Wed, 12/06/2017 - 10:00

Author(s): Darren Crowdy

We find expressions for the change in hydrodynamic slip length when a weakly shear-thinning fluid flows longitudinally, or transversely, over a periodic array of flat, unidirectional no-shear slots from a modified reciprocal theorem of Stokes flow and exact solutions for a Newtonian fluid.

[Phys. Rev. Fluids 2, 124201] Published Wed Dec 06, 2017

Emergent scar lines in chaotic advection of passive directors

Physical Review Fluids - Wed, 12/06/2017 - 10:00

Author(s): Bardia Hejazi, Bernhard Mehlig, and Greg A. Voth

When fibers are advected in a fluid flow, they organize into patterns dominated by scar lines across which the fiber orientation rotates by π. An exploration of the topology of the fiber orientation field in a 2D chaotic flow shows that scar lines form by a process of fluid stretching reversal.

[Phys. Rev. Fluids 2, 124501] Published Wed Dec 06, 2017

Dynamics of nonspherical microbubble oscillations above instability threshold

Physical Review E - Tue, 12/05/2017 - 10:00

Author(s): Matthieu Guédra, Sarah Cleve, Cyril Mauger, Philippe Blanc-Benon, and Claude Inserra

Time-resolved dynamics of nonspherical oscillations of micrometer-sized bubbles are captured and analyzed using high-speed imaging. The axisymmetry of the bubble shape is ensured with certainty for the first time from the recordings of two synchronous high-speed cameras located at 90∘. The temporal ...

[Phys. Rev. E 96, 063104] Published Tue Dec 05, 2017

Giant deviation of a relaxation time from generalized Newtonian theory in discontinuous shear thickening suspensions

Physical Review Fluids - Tue, 12/05/2017 - 10:00

Author(s): Rijan Maharjan and Eric Brown

Experimental study on discontinuous shear thickening fluids reveals that the relaxation times agree with a generalized Newtonian model for lower weight fractions. At high weight fractions, however, the relaxation times disagree by up to 4 orders of magnitude.

[Phys. Rev. Fluids 2, 123301] Published Tue Dec 05, 2017

Numerical study of two disks settling in an Oldroyd-B fluid: From periodic interaction to chaining

Physical Review E - Mon, 12/04/2017 - 10:00

Author(s): Tsorng-Whay Pan and Roland Glowinski

In this article, we present a numerical study of the dynamics of two disks sedimenting in a narrow vertical channel filled with an Oldroyd-B fluid. Two kinds of particle dynamics are observed: (i) a periodic interaction between the two disks, and (ii) the formation of a two-disk chain. For the perio...

[Phys. Rev. E 96, 063103] Published Mon Dec 04, 2017

Coalescence-induced droplet jumping on superhydrophobic surfaces: Effects of droplet mismatch

Physical Review Fluids - Mon, 12/04/2017 - 10:00

Author(s): Joram Wasserfall, Patric Figueiredo, Reinhold Kneer, Wilko Rohlfs, and Philipp Pischke

Superhydrophobic surfaces are designated by a low wettability that gives rise to self-cleaning. This study analyses the fluid dynamics of self-propelled droplet jumping upon binary unequal sized droplet coalescence with three-dimensional simulations.

[Phys. Rev. Fluids 2, 123601] Published Mon Dec 04, 2017


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