Convective Mass Transfer From Submerged Superhydrophobic Surfaces

Barth, Christina; Samaha, Mohamed A.; Tafreshi, H. Vahedi; Gad‐el‐Hak, Mohamed

doi:10.1260/1756-8250.5.2.79

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…On the other hand, Barth et al provided semi-analytical and numerical models to simulate the longevity of superhydrophobic flat surface comprised of spanwise microridges and subjected to both laminar [111] and turbulent [112] parallel flow. They solved the continuity, momentum, and mass transfer governing equations.…”

Section: Longevity Of Superhydrophobic Coatingsmentioning

confidence: 99%

Polymeric Slippery Coatings: Nature and Applications

Samaha

Gad‐el‐Hak

2014

Polymers

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Abstract:We review recent developments in nature-inspired superhydrophobic and omniphobic surfaces. Water droplets beading on a surface at significantly high static contact angles and low contact-angle hystereses characterize superhydrophobicity. Microscopically, rough hydrophobic surfaces could entrap air in their pores resulting in a portion of a submerged surface with air-water interface, which is responsible for the slip effect. Suberhydrophobicity enhances the mobility of droplets on lotus leaves for self-cleaning purposes, so-called lotus effect. Amongst other applications, superhydrophobicity could be used to design slippery surfaces with minimal skin-friction drag for energy conservation. Another kind of slippery coatings is the recently invented slippery liquid-infused porous surfaces (SLIPS), which are one type of omniphobic surfaces. Certain plants such as the carnivorous Nepenthes pitcher inspired SLIPS. Their interior surfaces have microstructural roughness, which can lock in place an infused lubricating liquid. The lubricant is then utilized as a repellent surface for other liquids such as water, blood, crude oil, and alcohol. In this review, we discuss the concepts of both lotus effect and Nepenthes slippery mechanism. We then present a review of recent advances in manufacturing polymeric and non-polymeric slippery surfaces with ordered and disordered micro/nanostructures. Furthermore, we discuss the performance and longevity of such surfaces. Techniques used to characterize the surfaces are also detailed. We conclude the article with an overview of the latest advances in characterizing and using slippery surfaces for different applications.

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Section: Longevity Of Superhydrophobic Coatingsmentioning

confidence: 99%

Polymeric Slippery Coatings: Nature and Applications

Samaha

Gad‐el‐Hak

2014

Polymers

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“…By applying a modified Blasius solution and integral method to the hydrodynamics and mass transfer equations, the theoretical study of Barth et al . 33 quantitatively characterized the air loss for surfaces with regular patterns with varying gas fraction, respectively. Their study aim at examining the practicality of superhydrophobic surfaces subjected to one of the many environmental factors (i.e., shear flow) that reduce the plastron life-time.…”

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Effect of Flow and Particle-Plastron Collision on the Longevity of Superhydrophobicity

Hokmabad

Ghaemi

2017

Sci Rep

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Among diverse methods for drag reduction, superhydrophobicity has shown considerable promise because it can produce a shear-free boundary without energy input. However, the plastron experiences a limited lifetime due to the dissolution of trapped air from surface cavities, into the surrounding water. The underwater longevity of the plastron, as it is influenced by environmental conditions, such as fine particles suspended in the water, must be studied in order to implement superhydrophobicity in practical applications. We present a proof-of-concept study on the kinetics of air loss from a plastron subjected to a canonical laminar boundary layer at Reδ = 1400 and 1800 (based on boundary layer thickness) with and without suspending 2 micron particles with density of 4 Kg/m3. To monitor the air loss kinetics, we developed an in situ non-invasive optical technique based on total internal reflection at the air-water interface. The shear flow at the wall is characterized by high resolution particle image velocimetry technique. Our results demonstrate that the flow-induced particle-plastron collision shortens the lifetime of the plastron by ~50%. The underlying physics are discussed and a theoretical analysis is conducted to further characterize the mass transfer mechanisms.

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Morphology evolution of liquid–gas interface on submerged solid structured surfaces

Huang

Duan

2019

Extreme Mechanics Letters

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Convective Mass Transfer From Submerged Superhydrophobic Surfaces

Cited by 10 publications

References 29 publications

Polymeric Slippery Coatings: Nature and Applications

Polymeric Slippery Coatings: Nature and Applications

Effect of Flow and Particle-Plastron Collision on the Longevity of Superhydrophobicity

Morphology evolution of liquid–gas interface on submerged solid structured surfaces

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