CHAPTER 10. Lubricant-Impregnated Surfaces

Solomon, Brian; Subramanyam, Srinivas Bengaluru; Farnham, Taylor A.; Khalil, Karim S.; Anand, Sam

doi:10.1039/9781782623953-00285

Cited by 34 publications

(63 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2011; Solomon et al. 2017). As far as drag reduction is concerned, the drainage of the infused fluid by the shearing action of the working fluid is a potential drawback.…”

Section: Homogenization For a Rough Impermeable Surfacementioning

confidence: 99%

“…These include promoting dropwise condensation, reducing ice adhesion, enhancing optical transmission, anti-fouling, friction reduction, etc. (Wong et al 2011;Solomon et al 2017). As far as drag reduction is concerned, the drainage of the infused fluid by the shearing action of the working fluid is a potential drawback.…”

Section: Superhydrophobic and Lubricant-infused Coatingsmentioning

confidence: 99%

See 1 more Smart Citation

Flow over natural or engineered surfaces: an adjoint homogenization perspective

Bottaro

2019

J. Fluid Mech.

View full text Add to dashboard Cite

Natural and engineered surfaces are never smooth, but irregular, rough at different scales, compliant, possibly porous, liquid impregnated or superhydrophobic. The correct numerical modelling of fluid flowing through and around them is important but poses problems. For media characterized by a periodic or quasi-periodic microstructure of characteristic dimensions smaller than the relevant scales of the flow, multiscale homogenization can be used to study the effect of the surface, avoiding the numerical resolution of small details. Here, we revisit the homogenization strategy using adjoint variables to model the interaction between a fluid in motion and regularly micro-textured, permeable or impermeable walls. The approach described allows for the easy derivation of auxiliary/adjoint systems of equations which, after averaging, yield macroscopic tensorial properties, such as permeability, elasticity, slip, transpiration, etc. When the fluid in the neighbourhood of the microstructure is in the Stokes regime, classical results are recovered. Adjoint homogenization, however, permits simple extension of the analysis to the case in which the flow displays nonlinear effects. Then, the properties extracted from the auxiliary systems take the name of effective properties and do not depend only on the geometrical details of the medium, but also on the microscopic characteristics of the fluid motion. Examples are shown to demonstrate the usefulness of adjoint homogenization to extract effective tensor properties without the need for ad hoc parameters. In particular, notable results reported herein include:(i)an original formulation to describe filtration in porous media in the presence of inertial effects;(ii)the microscopic and macroscopic equations needed to characterize flows through poroelastic media;(iii)an extended Navier’s condition to be employed at the boundary between a fluid and an impermeable rough wall, with roughness elements which can be either rigid or linearly elastic;(iv)the microscopic problems needed to define the relevant parameters for a Saffman-like condition at the interface between a fluid and a porous substrate; and(v)the macroscopic equations which hold at the dividing surface between a free-fluid region and a fluid-saturated poroelastic domain.

show abstract

“…2011; Solomon et al. 2017). As far as drag reduction is concerned, the drainage of the infused fluid by the shearing action of the working fluid is a potential drawback.…”

Section: Homogenization For a Rough Impermeable Surfacementioning

confidence: 99%

Section: Superhydrophobic and Lubricant-infused Coatingsmentioning

confidence: 99%

Flow over natural or engineered surfaces: an adjoint homogenization perspective

Bottaro

2019

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…Lubricant-impregnated surfaces (LIS) are textured surfaces impregnated with a lubricating fluid that can impart remarkable mobility to both Newtonian and non-Newtonian fluids [ 62 ] ( Fig. 3 ).…”

Section: Preliminary Spaceflight Experiments Designmentioning

confidence: 99%

Design of a spaceflight biofilm experiment

et al. 2018

Self Cite

View full text Add to dashboard Cite

Biofilm growth has been observed in Soviet/Russian (Salyuts and Mir), American (Skylab), and International (ISS) Space Stations, sometimes jeopardizing key equipment like spacesuits, water recycling units, radiators, and navigation windows. Biofilm formation also increases the risk of human illnesses and therefore needs to be well understood to enable safe, long-duration, human space missions. Here, the design of a NASA-supported biofilm in space project is reported. This new project aims to characterize biofilm inside the International Space Station in a controlled fashion, assessing changes in mass, thickness, and morphology. The space-based experiment also aims at elucidating the biomechanical and transcriptomic mechanisms involved in the formation of a “column-and-canopy” biofilm architecture that has previously been observed in space. To search for potential solutions, different materials and surface topologies will be used as the substrata for microbial growth. The adhesion of bacteria to surfaces and therefore the initial biofilm formation is strongly governed by topographical surface features of about the bacterial scale. Thus, using Direct Laser-Interference Patterning, some material coupons will have surface patterns with periodicities equal, above or below the size of bacteria. Additionally, a novel lubricant-impregnated surface will be assessed for potential Earth and spaceflight anti-biofilm applications. This paper describes the current experiment design including microbial strains and substrata materials and nanotopographies being considered, constraints and limitations that arise from performing experiments in space, and the next steps needed to mature the design to be spaceflight-ready.

show abstract

“…This enables the surface to lock in a lubricant liquid, which then repels the oils on the feet of insects, so they slide from the rim 634 into the digestive juices at the bottom of the cavity formed by the plant's cup shaped leaves [43][44][45][46] . The ability of these Slippery Liquid-Infused Porous Surfaces (SLIPS) [47] , which are a type of Lubricant-Impregnated Surface (LIS) [48,49] and build upon concepts of hemiwicking [7,[50][51][52][53] , to shed liquids rests on their combination of surface texture and the lubricant preferential wetting surface chemistry to remove pinning for other liquids so that droplets freely slide across their surface. Progress in understanding SLIPS and LIS and their applications is advancing rapidly [54][55][56][57][58][59][60][61][62][63][64][65][66] and there is a need to understand the concepts underpinning these different bio-inspired approaches to creating slippery liquid-shedding surfaces being developed within the wider literature.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Strategies for Smart Slippery Surfaces

2020

View full text Add to dashboard Cite

The problem of contact line pinning on surfaces is pervasive and contributes to problems from ring stains to ice formation. Here we provide a single conceptual framework for interfacial strategies encompassing five strategies for modifying the solid-liquid interface to remove pinning and increase droplet mobility. Three biomimetic strategies are included, (i) reducing the liquid-solid interfacial area inspired by the Lotus effect, (ii) converting the liquid-solid contact to a solid-solid contact by the formation of a liquid marble inspired by how galling aphids remove honeydew, and (iii) converting the liquid-solid interface to a liquid-lubricant contact by the use of a lubricant impregnated surface inspired by the Nepenthes Pitcher plant. Two further strategies are, (iv) converting the liquid-solid contact to a liquid-vapor contact by using the Leidenfrost effect, and (v) converting the contact to a liquid-liquid-like contact using slippery omniphobic covalent attachment of a liquid-like coating (SOCAL). Using these approaches, we explain how surfaces can be designed to have smart functionality whilst retaining the mobility of contact lines and droplets. Furthermore, we show how droplets can evaporate at constant contact angle, be positioned using a Cheerios effect, transported by boundary reconfiguration in an energy invariant manner, and drive the rotation of solid components in a Leidenfrost heat engine. Our conceptual framework enables the rationale design of surfaces which are slippery to liquids and is relevant to a diverse range of applications.

show abstract

CHAPTER 10. Lubricant-Impregnated Surfaces

Cited by 34 publications

References 0 publications

Flow over natural or engineered surfaces: an adjoint homogenization perspective

Flow over natural or engineered surfaces: an adjoint homogenization perspective

Design of a spaceflight biofilm experiment

Interfacial Strategies for Smart Slippery Surfaces

Contact Info

Product

Resources

About