Large-area superhydrophobic nanofiber array structures for drag reduction
نویسنده
چکیده
Surface with a static contact angle (CA) greater than 150° are in general defined as superhydrophobic surfaces. Superhydrophobic surface have great potentials in fundamental research,[1-5] and also wide practical applications in the production of textile, microfluidics, self-cleaning surfaces, building glass, windshields of cars, ships hulls, pipes and the satellite antenna surfaces.[6] Superhydrophobic surfaces can be produced in two ways: The first is to create a rough surface, and the second is to modify the surface using materials with low surface free energy.[1,5,7] Hydrophobicity is usually enhanced by surface roughness, especially by fractal structures using techniques such as self-assembly of a monolayer, photolithography, plasma polymerization, UV illumination, polymer coating, electrospinning, ion irradiation and the template method.[2,3,5,7-12]
منابع مشابه
Bio-inspired dewetted surfaces based on SiC/Si interlocked structures for enhanced-underwater stability and regenerative-drag reduction capability.
Drag reduction has become a serious issue in recent years in terms of energy conservation and environmental protection. Among diverse approaches for drag reduction, superhydrophobic surfaces have been mainly researched due to their high drag reducing efficiency. However, due to limited lifetime of plastron (i.e., air pockets) on superhydrophobic surfaces in underwater, the instability of dewett...
متن کاملFlexible conformable hydrophobized surfaces for turbulent flow drag reduction
In recent years extensive work has been focused onto using superhydrophobic surfaces for drag reduction applications. Superhydrophobic surfaces retain a gas layer, called a plastron, when submerged underwater in the Cassie-Baxter state with water in contact with the tops of surface roughness features. In this state the plastron allows slip to occur across the surface which results in a drag red...
متن کاملSustained drag reduction in a turbulent flow using a low-temperature Leidenfrost surface
Skin friction drag contributes a major portion of the total drag for small and large water vehicles at high Reynolds number (Re). One emerging approach to reducing drag is to use superhydrophobic surfaces to promote slip boundary conditions. However, the air layer or "plastron" trapped on submerged superhydrophobic surfaces often diminishes quickly under hydrostatic pressure and/or turbulent pr...
متن کاملDrag reduction on a patterned superhydrophobic surface.
We present an experimental study of a low-Reynolds number shear flow between two surfaces, one of which has a regular grooved texture augmented with a superhydrophobic coating. The combination reduces the effective fluid-surface contact area, thereby appreciably decreasing the drag on the surface and effectively changing the macroscopic boundary condition on the surface from no slip to limited ...
متن کاملSignificant and stable drag reduction with air rings confined by alternated superhydrophobic and hydrophilic strips
Superhydrophobic surfaces have the potential to reduce the viscous drag of liquids by significantly decreasing friction at a solid-liquid interface due to the formation of air layers between solid walls and interacting liquids. However, the trapped air usually becomes unstable due to the finite nature of the domain over which it forms. We demonstrate for the first time that a large surface ener...
متن کامل