Ultra fast laser machined hydrophobic stainless steel surface for drag reduction in laminar flows

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Abstract

Hydrophobic surfaces have attracted much attention due to their potential in microfluidics, lab on chip devices and as functional surfaces for the automotive and aerospace industry. The combination of a dual scale roughness with an inherent low-surface-energy coating material is the pre-requisite factor for the development of an artificial superhydrophobic surfaces. Ultra short pulse laser (USPL) machining/structuring is a promising technique to obtain the dual scale roughness. Moreover, ultra short laser pulses allow machining without or with limited thermal effects. Flat stainless steel (AISI 304L) were laser machined with ultraviolet laser pulses of 6.7ps, at different laser processing parameters. Next, the samples were coated with a monolayer of perfluorinated octyltrichlorosilane (FOTS) to get a superhydrophobic surface. The degree of hydrophobicity was accessed by static contact angle measurement. Laser patterned surface has longitudinal micro channels. Drag reduction in liquid flow can be obtained due to the shear free boundary condition at air-liquid menisci. The geometry of the patterns was analyzed with optical and scanning electron microscopy. Micro-Particle Image Velocimetry (μPIV) has been employed to measure and visualize the flow over such patterns
Original languageUndefined
Title of host publicationProceedings of the 11th International Symposium on Laser Precision Microfabrication
Place of PublicationStuttgart, Germany
PublisherJPLS Japan Laser Processing Society
Pages1-6
Publication statusPublished - 8 Jun 2010
Event11th International Symposium on Laser Precision Microfabrication, LPM 2010 - Stuttgart, Germany
Duration: 7 Jun 201010 Jun 2010
Conference number: 11

Conference

Conference11th International Symposium on Laser Precision Microfabrication, LPM 2010
Abbreviated titleLPM
CountryGermany
CityStuttgart
Period7/06/1010/06/10

Keywords

  • drag reduction
  • contact angle
  • laser patterning
  • METIS-267226
  • IR-79814
  • Hydrophobic
  • Micro-structure

Cite this

Radhakrishnan, J., Pathiraj, B., Gomez Marin, A., Arnaldo del Cerro, D., Lammertink, R. G. H., Lohse, D., ... Römer, G. R. B. E. (2010). Ultra fast laser machined hydrophobic stainless steel surface for drag reduction in laminar flows. In Proceedings of the 11th International Symposium on Laser Precision Microfabrication (pp. 1-6). Stuttgart, Germany: JPLS Japan Laser Processing Society.
Radhakrishnan, J. ; Pathiraj, B. ; Gomez Marin, Alvaro ; Arnaldo del Cerro, D. ; Lammertink, Rob G.H. ; Lohse, Detlef ; Huis in 't Veld, Bert ; Römer, Gerardus Richardus, Bernardus, Engelina. / Ultra fast laser machined hydrophobic stainless steel surface for drag reduction in laminar flows. Proceedings of the 11th International Symposium on Laser Precision Microfabrication. Stuttgart, Germany : JPLS Japan Laser Processing Society, 2010. pp. 1-6
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abstract = "Hydrophobic surfaces have attracted much attention due to their potential in microfluidics, lab on chip devices and as functional surfaces for the automotive and aerospace industry. The combination of a dual scale roughness with an inherent low-surface-energy coating material is the pre-requisite factor for the development of an artificial superhydrophobic surfaces. Ultra short pulse laser (USPL) machining/structuring is a promising technique to obtain the dual scale roughness. Moreover, ultra short laser pulses allow machining without or with limited thermal effects. Flat stainless steel (AISI 304L) were laser machined with ultraviolet laser pulses of 6.7ps, at different laser processing parameters. Next, the samples were coated with a monolayer of perfluorinated octyltrichlorosilane (FOTS) to get a superhydrophobic surface. The degree of hydrophobicity was accessed by static contact angle measurement. Laser patterned surface has longitudinal micro channels. Drag reduction in liquid flow can be obtained due to the shear free boundary condition at air-liquid menisci. The geometry of the patterns was analyzed with optical and scanning electron microscopy. Micro-Particle Image Velocimetry (μPIV) has been employed to measure and visualize the flow over such patterns",
keywords = "drag reduction, contact angle, laser patterning, METIS-267226, IR-79814, Hydrophobic, Micro-structure",
author = "J. Radhakrishnan and B. Pathiraj and {Gomez Marin}, Alvaro and {Arnaldo del Cerro}, D. and Lammertink, {Rob G.H.} and Detlef Lohse and {Huis in 't Veld}, Bert and R{\"o}mer, {Gerardus Richardus, Bernardus, Engelina}",
year = "2010",
month = "6",
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Radhakrishnan, J, Pathiraj, B, Gomez Marin, A, Arnaldo del Cerro, D, Lammertink, RGH, Lohse, D, Huis in 't Veld, B & Römer, GRBE 2010, Ultra fast laser machined hydrophobic stainless steel surface for drag reduction in laminar flows. in Proceedings of the 11th International Symposium on Laser Precision Microfabrication. JPLS Japan Laser Processing Society, Stuttgart, Germany, pp. 1-6, 11th International Symposium on Laser Precision Microfabrication, LPM 2010, Stuttgart, Germany, 7/06/10.

Ultra fast laser machined hydrophobic stainless steel surface for drag reduction in laminar flows. / Radhakrishnan, J.; Pathiraj, B.; Gomez Marin, Alvaro; Arnaldo del Cerro, D.; Lammertink, Rob G.H.; Lohse, Detlef; Huis in 't Veld, Bert; Römer, Gerardus Richardus, Bernardus, Engelina.

Proceedings of the 11th International Symposium on Laser Precision Microfabrication. Stuttgart, Germany : JPLS Japan Laser Processing Society, 2010. p. 1-6.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

TY - GEN

T1 - Ultra fast laser machined hydrophobic stainless steel surface for drag reduction in laminar flows

AU - Radhakrishnan, J.

AU - Pathiraj, B.

AU - Gomez Marin, Alvaro

AU - Arnaldo del Cerro, D.

AU - Lammertink, Rob G.H.

AU - Lohse, Detlef

AU - Huis in 't Veld, Bert

AU - Römer, Gerardus Richardus, Bernardus, Engelina

PY - 2010/6/8

Y1 - 2010/6/8

N2 - Hydrophobic surfaces have attracted much attention due to their potential in microfluidics, lab on chip devices and as functional surfaces for the automotive and aerospace industry. The combination of a dual scale roughness with an inherent low-surface-energy coating material is the pre-requisite factor for the development of an artificial superhydrophobic surfaces. Ultra short pulse laser (USPL) machining/structuring is a promising technique to obtain the dual scale roughness. Moreover, ultra short laser pulses allow machining without or with limited thermal effects. Flat stainless steel (AISI 304L) were laser machined with ultraviolet laser pulses of 6.7ps, at different laser processing parameters. Next, the samples were coated with a monolayer of perfluorinated octyltrichlorosilane (FOTS) to get a superhydrophobic surface. The degree of hydrophobicity was accessed by static contact angle measurement. Laser patterned surface has longitudinal micro channels. Drag reduction in liquid flow can be obtained due to the shear free boundary condition at air-liquid menisci. The geometry of the patterns was analyzed with optical and scanning electron microscopy. Micro-Particle Image Velocimetry (μPIV) has been employed to measure and visualize the flow over such patterns

AB - Hydrophobic surfaces have attracted much attention due to their potential in microfluidics, lab on chip devices and as functional surfaces for the automotive and aerospace industry. The combination of a dual scale roughness with an inherent low-surface-energy coating material is the pre-requisite factor for the development of an artificial superhydrophobic surfaces. Ultra short pulse laser (USPL) machining/structuring is a promising technique to obtain the dual scale roughness. Moreover, ultra short laser pulses allow machining without or with limited thermal effects. Flat stainless steel (AISI 304L) were laser machined with ultraviolet laser pulses of 6.7ps, at different laser processing parameters. Next, the samples were coated with a monolayer of perfluorinated octyltrichlorosilane (FOTS) to get a superhydrophobic surface. The degree of hydrophobicity was accessed by static contact angle measurement. Laser patterned surface has longitudinal micro channels. Drag reduction in liquid flow can be obtained due to the shear free boundary condition at air-liquid menisci. The geometry of the patterns was analyzed with optical and scanning electron microscopy. Micro-Particle Image Velocimetry (μPIV) has been employed to measure and visualize the flow over such patterns

KW - drag reduction

KW - contact angle

KW - laser patterning

KW - METIS-267226

KW - IR-79814

KW - Hydrophobic

KW - Micro-structure

M3 - Conference contribution

SP - 1

EP - 6

BT - Proceedings of the 11th International Symposium on Laser Precision Microfabrication

PB - JPLS Japan Laser Processing Society

CY - Stuttgart, Germany

ER -

Radhakrishnan J, Pathiraj B, Gomez Marin A, Arnaldo del Cerro D, Lammertink RGH, Lohse D et al. Ultra fast laser machined hydrophobic stainless steel surface for drag reduction in laminar flows. In Proceedings of the 11th International Symposium on Laser Precision Microfabrication. Stuttgart, Germany: JPLS Japan Laser Processing Society. 2010. p. 1-6