Latest papers in fluid mechanics

Breakup of asymmetric liquid ligaments

Physical Review Fluids - Thu, 12/19/2019 - 10:00

Author(s): Carole Planchette, Francesco Marangon, Wen-Kai Hsiao, and Günter Brenn

Asymmetric liquid ligaments typically produced by inkjet printing may recoil or a drop may pinch off. Scaling laws are provided for these two competing processes, and it is shown that long and short ligaments experience different pinch-off regimes.


[Phys. Rev. Fluids 4, 124004] Published Thu Dec 19, 2019

Short-term oscillation and falling dynamics for a water drop dripping in quiescent air

Physical Review Fluids - Wed, 12/18/2019 - 10:00

Author(s): B. Zhang, Y. Ling, P.-H. Tsai, A.-B. Wang, S. Popinet, and S. Zaleski

The short-term falling dynamics of a dripping water drop is studied by simulation and experiment. The pinching dynamics introduces a nonlinear multimode oscillation. A complex transient flow around the drop is induced by the interaction between the falling motion and the shape oscillation.


[Phys. Rev. Fluids 4, 123604] Published Wed Dec 18, 2019

Electrohydrodynamic generation of atmospheric turbulence

Physical Review Fluids - Wed, 12/18/2019 - 10:00

Author(s): Yuan Yao and Jesse Capecelatro

The role of electrohydrodynamics on the generation of atmospheric turbulence is studied theoretically and numerically. A nonlinear feedback loop is identified whereby charged aerosols self-induce an electric field, resulting in a body force on the ionized air, augmenting the atmospheric turbulence.


[Phys. Rev. Fluids 4, 123701] Published Wed Dec 18, 2019

Gas-assisted discharge flow of granular media from silos

Physical Review Fluids - Wed, 12/18/2019 - 10:00

Author(s): Y. Zhou, P.-Y. Lagrée, S. Popinet, P. Ruyer, and P. Aussillous

Experiments and a two-phase continuum model are used to study how gas flow enhances silo discharge. A modified Hagen-Beverloo law is proposed, taking into account the gas flow rate, the particle size, and the silo and orifice geometry.


[Phys. Rev. Fluids 4, 124305] Published Wed Dec 18, 2019

Application of the stochastic closure theory to the Townsend-Perry constants

Physical Review E - Mon, 12/16/2019 - 10:00

Author(s): John Kaminsky, Joe Klewicki, and Björn Birnir

We compare the stochastic closure theory (SCT) to the Townsend-Perry constants as estimated from measurements in the Flow Physic Facility (FPF) at the University of New Hampshire. First, we explain the derivation of the Townsend-Perry constants, which were originally formulated by Meneveau and Marus...


[Phys. Rev. E 100, 061101(R)] Published Mon Dec 16, 2019

Elastoplastic behavior of yield stress fluids

Physical Review Fluids - Mon, 12/16/2019 - 10:00

Author(s): E. N’Gouamba, J. Goyon, and P. Coussot

Experiments show that the solid-liquid transition of yield stress fluids (emulsions, gels, foams, suspensions, etc.) is associated with the breakage (collapse) of a basic elastic network for a critical deformation, while progressively larger additional elastoplastic deformations take place in the system up to yielding.


[Phys. Rev. Fluids 4, 123301] Published Mon Dec 16, 2019

Jet direction in bubble collapse within rectangular and triangular channels

Physical Review E - Fri, 12/13/2019 - 10:00

Author(s): Lebo Molefe and Ivo R. Peters

A vapor bubble collapsing near a solid boundary in a liquid produces a liquid jet that points toward the boundary. The direction of this jet has been studied for boundaries such as flat planes and parallel walls enclosing a channel. Extending these investigations to enclosed polygonal boundaries, we...


[Phys. Rev. E 100, 063105] Published Fri Dec 13, 2019

Integral model for multiple forced plumes arranged around a circle in a linearly stratified environment

Physical Review Fluids - Fri, 12/13/2019 - 10:00

Author(s): Zhiguo He and Yingzhong Lou

An integral model is developed to predict the mixing of multiple forced plumes evenly spaced around a circle in a stratified environment, e.g., buoyant plumes in nature. The model reasonably captures the significant plume boundary distortion caused by plume interactions at the touching height.


[Phys. Rev. Fluids 4, 123501] Published Fri Dec 13, 2019

Self-organized dip-coating patterns of simple, partially wetting, nonvolatile liquids

Physical Review Fluids - Fri, 12/13/2019 - 10:00

Author(s): Walter Tewes, Markus Wilczek, Svetlana V. Gurevich, and Uwe Thiele

Using analytical and numerical methods we examine a solid substrate withdrawn from a liquid bath. After withdrawal the substrate may be macroscopically dry or coated homogeneously by a liquid film. We show that a regular liquid ridge pattern oriented parallel to the meniscus can also be deposited.


[Phys. Rev. Fluids 4, 123903] Published Fri Dec 13, 2019

Stability boundaries for the Rayleigh-Taylor instability in accelerated elastic-plastic solid slabs

Physical Review E - Thu, 12/12/2019 - 10:00

Author(s): A. R. Piriz, S. A. Piriz, and N. A. Tahir

The linear theory of the incompressible Rayleigh-Taylor instability in elastic-plastic solid slabs is developed on the basis of the simplest constitutive model consisting in a linear elastic (Hookean) initial stage followed by a rigid-plastic phase. The slab is under the action of a constant acceler...


[Phys. Rev. E 100, 063104] Published Thu Dec 12, 2019

Gravity induced formation of spinners and polar order of spherical microswimmers on a surface

Physical Review Fluids - Thu, 12/12/2019 - 10:00

Author(s): Zaiyi Shen and Juho S. Lintuvuori

When squirmer type swimmers sediment on a flat surface, the near field hydrodynamic interactions lead to the formation of small spinners at low concentrations. Higher surface coverage results in a polar order of the swimmers and a particle vortex is observed when confined by a circular wall.


[Phys. Rev. Fluids 4, 123101] Published Thu Dec 12, 2019

Role of extensional rheology on droplet bouncing

Physical Review Fluids - Thu, 12/12/2019 - 10:00

Author(s): Min Y. Pack, Angela Yang, Antonio Perazzo, Boyang Qin, and Howard A. Stone

Experiments show that the addition of polymers in droplets enhances the droplet rebound effect when bouncing on a thin film of air.


[Phys. Rev. Fluids 4, 123603] Published Thu Dec 12, 2019

Hydrodynamic response of a surfactant-laden interface to a radial flow

Physical Review Fluids - Thu, 12/12/2019 - 10:00

Author(s): T. Bickel, J.-C. Loudet, G. Koleski, and B. Pouligny

The Stokes flow of a submerged jet directed toward a free interface is investigated theoretically. The presence of a minute amount of surface-active agents drastically modifies the hydrodynamic response of the interface.


[Phys. Rev. Fluids 4, 124002] Published Thu Dec 12, 2019

Physics of nanoscale immiscible fluid displacement

Physical Review Fluids - Wed, 12/11/2019 - 10:00

Author(s): Gerald J. Wang, Angelo Damone, Francesco Benfenati, Pietro Poesio, Gian Paolo Beretta, and Nicolas G. Hadjiconstantinou

At the nanoscale, and in particular in the presence of slip, hydrodynamic bending of interfaces between immiscible liquids becomes negligible. The dynamic contact angle is then governed by the Molecular Kinetic Theory (MKT) of Blake and collaborators.


[Phys. Rev. Fluids 4, 124203] Published Wed Dec 11, 2019

Mass transfer from a cylindrical body in a linear ambient velocity distribution

Physical Review Fluids - Wed, 12/11/2019 - 10:00

Author(s): Ehud Yariv

Asymptotic methods and conformal mappings are used to study mass or heat transport from a particle that is subject to a weak flow.


[Phys. Rev. Fluids 4, 124503] Published Wed Dec 11, 2019

Vibroequilibria in microgravity: Comparison of experiments and theory

Physical Review E - Tue, 12/10/2019 - 10:00

Author(s): P. Salgado Sánchez, J. Fernández, I. Tinao, and J. Porter

Experiments on vibrated fluids confined in cylindrical and cuboidal containers were performed under the reduced gravity conditions of a parabolic flight. The results constitute a systematic quantitative investigation of the vibroequilibria effect, which refers to the reorientation of vibrated fluids...


[Phys. Rev. E 100, 063103] Published Tue Dec 10, 2019

Forced dynamic dewetting of structured surfaces: Influence of surfactants

Physical Review Fluids - Mon, 12/09/2019 - 10:00

Author(s): Franziska Henrich, Dorota Linke, Hans Martin Sauer, Edgar Dörsam, Steffen Hardt, Hans-Jürgen Butt, and Günter K. Auernhammer

The interaction of pinning and surfactant-induced changes of dynamic contact angles on receding contact lines is studied. With increasing surfactant concentration the surfactant-induced effects dominate over pinning effects. This behavior is correlated to the emptying of the surface structures.


[Phys. Rev. Fluids 4, 124202] Published Mon Dec 09, 2019

Role of large-scale advection and small-scale turbulence on vertical migration of gyrotactic swimmers

Physical Review Fluids - Mon, 12/09/2019 - 10:00

Author(s): C. Marchioli, H. Bhatia, G. Sardina, L. Brandt, and A. Soldati

The role of large-scale motions and small-scale turbulence on rising of small bottom-heavy swimmers is examined via high Reynolds number direct numerical simulation of turbulent free-surface flow. The swimmers’ rising efficiency is quantified via a new timescale that combines the stability number and the Kolmogorov timescale.


[Phys. Rev. Fluids 4, 124304] Published Mon Dec 09, 2019

Potential-core closing of temporally developing jets at Mach numbers between 0.3 and 2: Scaling and conditional averaging of flow and sound fields

Physical Review Fluids - Mon, 12/09/2019 - 10:00

Author(s): Christophe Bogey and Pierre Pineau

Using direct numerical simulation, the potential-core closing of temporally developing round jets at Mach numbers between 0.3 and 2 is shown to radiate strong axisymmetric acoustic waves in the downstream direction. The Mach number dependence and the generation mechanism of these waves are revealed.


[Phys. Rev. Fluids 4, 124601] Published Mon Dec 09, 2019

Turbulent flows around side-by-side cylinders with regular and multiscale arrangements

Physical Review Fluids - Mon, 12/09/2019 - 10:00

Author(s): Shancong Tao and Yi Zhou

A numerical study confirms that by using multiscale structures, turbulence with a wider range of scales can be generated. However, the multiscale-generated turbulence may not have a long-lasting memory and can eventually forget its multiscale initial conditions.


[Phys. Rev. Fluids 4, 124602] Published Mon Dec 09, 2019

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