Surface functionalization by nanosecond-laser texturing for controlling hydrodynamic cavitation dynamics

Petkovšek, Martin; Hočevar, Matej; Gregorčič, Peter

doi:10.1016/j.ultsonch.2020.105126

Cited by 23 publications

(11 citation statements)

References 39 publications

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“…Hydrodynamic cavitation dynamics of droplets on hot surfaces is strongly correlated with various factors including the surface roughness of the heated surface that are kept in contact with droplets [324]. In recent reports, it was shown that micro-patterned surfaces are capable to significantly reduce the so-called Leidenfrost point (LFP), a critical temperature above which the vapor film between the droplet and hot surface is able to allow levitation of droplets [325,326].…”

Section: D) Control Of Condensation Rates and Impact On Anti-icing Prmentioning

confidence: 99%

Laser engineering of biomimetic surfaces

Stratakis

Bonse

Heitz

et al. 2020

Materials Science and Engineering: R: Reports

229

143

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The exciting properties of micro-and nano-patterned surfaces found in natural species hide a virtually endless potential of technological ideas, opening new opportunities for innovation and exploitation in materials science and engineering. Due to the diversity of biomimetic surface functionalities, inspirations from natural surfaces are interesting for a broad range of applications in engineering, including phenomena of adhesion, friction, wear, lubrication, wetting phenomena, self-cleaning, antifouling, antibacterial phenomena, thermoregulation and optics. Lasers are increasingly proving to be promising tools for the precise and controlled structuring of materials at micro-and nano-scales. When ultrashort-pulsed lasers are used, the optimal interplay between laser and material parameters enables structuring down to the nanometer scale. Besides this, a unique aspect of laser processing technology is the possibility for material modifications at multiple (hierarchical) length scales, leading to the complex biomimetic micro-and nano-scale patterns, while adding a new dimension to structure optimization. This article reviews the current state of the art of laser processing methodologies, which are being used for the fabrication of bioinspired artificial surfaces to realize extraordinary wetting, optical, mechanical, and biological-active properties for numerous applications. The innovative aspect of laser functionalized biomimetic surfaces for a wide variety of current and future applications is particularly demonstrated and discussed. The article concludes with illustrating the wealth of arising possibilities and the number of new laser micro/nano fabrication approaches for obtaining complex high-resolution features, which prescribe a future where control of structures and subsequent functionalities are beyond our current imagination.

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Section: D) Control Of Condensation Rates and Impact On Anti-icing Prmentioning

confidence: 99%

Laser engineering of biomimetic surfaces

Stratakis

Bonse

Heitz

et al. 2020

Materials Science and Engineering: R: Reports

229

143

View full text Add to dashboard Cite

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“…The basic mechanism of vortex shedding on a moving cylinder is Karman's vortex street, in which vortices of single-or multiphase fluid (in the case of a cavitating flow) structures periodically develop and detach from the cylinder surface [24]. Assuming a Strouhal number of St = 0.2 (a typical value occurring in a wide range of Reynolds numbers), the shedding frequency f s ¼ StÁv d in the near-wake of the pins with 6.5 mm diameter can be estimated to 992 Hz [25].…”

Section: Local Cavitation Propertiesmentioning

confidence: 99%

Multiparametric experimental analysis of the pin disc rotational cavitation generator

Gostiša

Širok

Bizjan

et al. 2023

Engineering Science and Technology, an International Journal

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“…However, this section also briefly presents a general concept of changing the surface wettability through the morphology and chemistry modification by laser-surface interaction. This concept isin addition to the boiling heat transferimportant also for biomedical [106,[120][121][122], corrosion [123][124][125][126], tribological [127][128][129][130], and fluid-flow [131] applications.…”

Section: Laser Surface Engineeringmentioning

confidence: 99%

Laser Surface Engineering for Boiling Heat Transfer Applications

Zupančič

Gregorčič

2021

Materials With Extreme Wetting Properties

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Nucleate boiling is inseparably connected with our everyday life. It is not only utilized in simple tasks like cooking, but it is also important for applications on various scales, ranging from enormous nuclear power plants to miniature microelectronics. This widespread integration is the result of its ability for effective heat transfer at low temperature differences between the heated surface and the surrounding fluid. The surface wettability undoubtedly influences the boiling heat transfer, but the observed behaviour cannot be explained without taking into account the surface topography and chemical modifications due to intense boiling processes. This chapter demonstrates how nucleate boiling enhancement can be achieved on surfaces with various wetting properties and specific micro/nano topographical features, fabricated using a straightforward, robust and scalable laser texturing approach. We discuss the basics of nucleate boiling and how it is affected by surface wettability; provide a fundamental background of laser surface engineering and its ability to achieve extreme wetting properties; and finally demonstrate the applicability of the laser-textured surfaces in enhancing and controlling nucleate pool boiling of different fluids. We show how laser surface engineering decreases the wettability effects on the key boiling parameters andin this wayensures more stable heat transfer performance.

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Surface functionalization by nanosecond-laser texturing for controlling hydrodynamic cavitation dynamics

Cited by 23 publications

References 39 publications

Laser engineering of biomimetic surfaces

Laser engineering of biomimetic surfaces

Multiparametric experimental analysis of the pin disc rotational cavitation generator

Laser Surface Engineering for Boiling Heat Transfer Applications

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