Giant Drag Reduction in Complex Fluid Drops on Rough Hydrophobic Surfaces

Luu, Li‐Hua; Forterre, Yoël

doi:10.1103/physrevlett.110.184501

Cited by 26 publications

(26 citation statements)

References 37 publications

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“…In all the cases simulated below, it is found that mesh refinement may lead to results variation no more than 5%. M a n u s c r i p t 13 After a single droplet interacts with a solid substrate and the subsequent impact occurs, the structure of droplet can be accordingly modified. To measure the droplet deformation, the height of droplet (H), contact length (L) and local contact angle ( c θ )…”

Section: Resultsmentioning

confidence: 99%

“…It is found that the impinging droplet with very small amount of kinetic energy is able to make the coalesced droplets detach from the surface. Luu and Forterre [13] observed that the maximal spreading diameter of elastic fluid droplets impact onto rough surfaces could be as much as twice larger than those on smooth surfaces, which may lead to apparent basal friction reduction of more than 80%.…”

Section: Introductionmentioning

confidence: 98%

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Lattice Boltzmann investigation of droplets impact behaviors onto a solid substrate

Huang

Yan

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Lattice Boltzmann investigation of droplets impact behaviors onto a solid substrate

Huang

Yan

2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…The fluid used in this experimental study is a solution of polymer micro-gel Carbopol at a 0.1 wt% concentration. In the literature, this material has been widely used as a model viscoplastic fluid in standard rheological measurements [23,24], channel configurations [16,25,26], drag force studies [27,28], and more complex hydrodynamics such as gravity-driven free-surface flows [29][30][31], fingering instabilities [32,33] and drop impacts [34,35]. The choice for this yield-stress fluid is often related to its ease of preparation and to the stability of its rheological properties over time (i.e.…”

Section: A Model Yield-stress Fluidmentioning

confidence: 99%

Experimental study of the solid-liquid interface in a yield-stress fluid flow upstream of a step

Luu¹,

Philippe²,

Chambon

2015

Phys. Rev. E

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We present an experimental study investigating the transition zone between a liquid-like unyielded region and a solid-like yielded region in a yield-stress fluid. The configuration consists of a rectangular closed-channel flow disturbed by the presence of a step. Upstream of the step, a solid-liquid interface between a dead zone and a flow zone appears. In this study, we use a model fluid, namely polymer micro-gel Carbopol, which exhibits Herschel-Bulkley viscoplastic rheology. Exploiting the fluid transparency, the flow is monitored by particle image velocimetry using an internal visualization technique. The main outcome of this study is to show that, except in a thin transition layer close to the solid-liquid interface, the flow behaves as an apparent Poiseuille flow with an apparent slip condition at the base. The slip frontier is found to be almost independent of the flow rate while the corresponding slip velocity increases with the flow rate.

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“…In the aspect of experimental study, Reference [8] observed that the maximal spreading diameter of elastic fluid droplets impact onto rough surfaces could be as much as twice larger than those on smooth surfaces. Reference [9] demonstrated an empirical equation for a milimeter sized droplet about the fall speed and fall height by using a shadowgraph method with a rapid CCD camera system.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Motion of Micrometer Sized Droplets of Dielectric Water-based Paint under Air Flow and Electric Field

Xu¹,

Zhang²

2018

IJMMM

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In the present study, the motion of the micrometer sized droplets of dielectric water-based paint in the air is investigated numerically. The effects of gravity, the inlet velocity of air flow and applied external positive DC electric field have been taken into account. In the first part, the motion of the droplets is simulated. It is found that the effect of gravity and inlet velocity of air flow can be neglected under our conditions. In the second part, the motions of the droplets under the external electric field are simulated to investigate the effect of electric field. Our results show that the external positive electric field can result the fall speed increase comparison with the condition under no electric field. It is also observed that impact time decreases as electric potential increases. The simulation results show that the Navier-Stokes equations coupled with other fields provide an effective approach to analyze the dynamic problems for liquid droplet. Index Terms-Droplet, level set method, electric field, water-based paint.

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Giant Drag Reduction in Complex Fluid Drops on Rough Hydrophobic Surfaces

Cited by 26 publications

References 37 publications

Lattice Boltzmann investigation of droplets impact behaviors onto a solid substrate

Lattice Boltzmann investigation of droplets impact behaviors onto a solid substrate

Experimental study of the solid-liquid interface in a yield-stress fluid flow upstream of a step

Simulation of Motion of Micrometer Sized Droplets of Dielectric Water-based Paint under Air Flow and Electric Field

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