Controlling the stainless steel surface wettability by nanosecond direct laser texturing at high fluences

Gregorčič, Peter; Šetina-Batič, B.; Hočevar, Matej

doi:10.1007/s00339-017-1392-5

Cited by 104 publications

(83 citation statements)

References 38 publications

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“…The processed surface was placed in a focal position. In this study, the laser-surface interaction leads to modification of both the surface chemistry and topography which, in fact, contribute to changes in the wettability of the surface [22].…”

Section: Design and Fabrication Of The Boiling Surfacesmentioning

confidence: 99%

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Voglar

Gregorčič

Zupančič

et al. 2018

International Journal of Heat and Mass Transfer

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This investigation used laser-processed 25-μm-thick stainless steel foils as heaters in pool boiling experiments under subcooled and saturated conditions at atmospheric pressure. Boling surfaces were modified by a nanosecond fiber laser. In most cases, laser-textured parts on boiling surfaces were spaced apart by a capillary length of water (2.5 mm) and had different shapes and arrangements. Multi-scale micro-cavities (with diameters ranging from 0.2 to 10 μm) on the laser-textured areas of the surfaces provided potential active nucleation sites. The highest heat flux measured before the burnout was observed on the fully treated sample; this heat flux was a factor of 3.7 greater than that of the untreated sample. The sample with hexagonally arranged textured circular shapes with a diameter of 2.0 mm provided a more than 4-fold higher heat transfer coefficient compared to the untreated sample. All of the laser-textured boiling surfaces showed enhanced pool boiling heat transfer performance in comparison to the untreated surface. The optimal spacing between the laser-textured regions was experimentally found to be equal to the capillary length of the working fluid. Our results demonstrate that laser texturing has strong potential for producing patterned surfaces for engineering applications of boiling heat transfer.

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Section: Design and Fabrication Of The Boiling Surfacesmentioning

confidence: 99%

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Voglar

Gregorčič

Zupančič

et al. 2018

International Journal of Heat and Mass Transfer

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“…After DLT, all textured samples were superhydrophilic in a saturated Wenzel regime (a static contact angle equaled 0°), similar as in Ref. [5].…”

Section: Cylinder Surface Texturingmentioning

confidence: 72%

“…Their surfaces were modified by (DLT) with a nanosecond fiber laser. Several recent studies [3,4,5] have shown that DLT can be used for surface functionalization, since it influences on surface topography and also on surface wettability -immediately after DLT, the textured surfaces become superhydrophilic and after some time the transition to superhydrophobic state may occurs.…”

Section: Introductionmentioning

confidence: 99%

Cavitation Dynamics on Laser-Textured Surfaces

Petkovšek¹,

Hočevar²,

Gregorčič³

2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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This study examines hydrodynamic cavitation behavior on laser-textured surfaces. Cavitation dynamics was investigated on stainless steel cylinders with 10 mm in diameter. Their surfaces were modified by direct laser texturing (DLT) with a nanosecond fiber laser (wavelength of 1060 nm). A highly-polished cylinder was used as a reference. Cavitation characteristics behind circular cylinders were monitored simultaneously by high-speed visualization and high frequency pressure transducer. Comparison at similar cavitation numbers proves, that cavitation characteristics differ significantly between different micro-structured surfaces. In some cases, cavitation extent decrease in comparison with reference -a highly polished cylinder.

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“…As the width of the microscopic features can be varied by the pulse/line spacing, the scan number has a greater effect on the feature height. In particular, nanosecond lasers have been used during the past for the fabrication of high aspect-ratio surface features, among others, demonstrated in [52,53]. A recent study reports on the gradually increase of the friction coefficient with higher line density [54].…”

Section: Deterministic Surface Textures and Groove Structuresmentioning

confidence: 99%

“…A recent study reports on the gradually increase of the friction coefficient with higher line density [54]. In any case, the fabrication of deterministic surface features with nanosecond lasers is characterized by strong material melting accompanied by a greater influence of the laser processing on the crystallographic structure, as observed up to 80 µm from the surface for the nanosecond laser regime [53]. This processing behavior can be a serious disadvantage that hinders the use of the cost-effective nanosecond laser technology for desired (micro-)engineering needs.…”

Section: Deterministic Surface Textures and Groove Structuresmentioning

confidence: 99%

High-Rate Laser Surface Texturing for Advanced Tribological Functionality

et al. 2020

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This article features with the enhancement of the static coefficient of friction by laser texturing the contact surfaces of tribological systems tested under dry friction conditions. The high-rate laser technology was applied for surface texturing at unprecedented processing rates, namely using powerful ultrashort pulses lasers in combination with ultrafast polygon-mirror based scan systems. The laser textured surfaces were analyzed by ion beam slope cutting and Raman measurements, showing a crystallographic disordering of the produced microscopic surface features. The laser induced self-organizing periodic surface structures as well as deterministic surface textures were tested regarding their tribological behavior. The highest static coefficient of friction was found of µ20 = 0.68 for a laser textured cross pattern that is 126% higher than for a fine grinded reference contact system. The line pattern was textured on a shaft-hub connection where the static coefficient of friction increased up to 75% that demonstrates the high potential of the technology for real-world applications.

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Controlling the stainless steel surface wettability by nanosecond direct laser texturing at high fluences

Cited by 104 publications

References 38 publications

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Boiling performance on surfaces with capillary-length-spaced one- and two-dimensional laser-textured patterns

Cavitation Dynamics on Laser-Textured Surfaces

High-Rate Laser Surface Texturing for Advanced Tribological Functionality

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