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

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Jagdheesh, R. and Pathiraj, B. and Marin, A.G. and Arnaldo del Cerro, D. and Lammertink, R.G.H. and Lohse, D. and Huis in 't Veld, A.J. and Römer, G.R.B.E. (2010) Ultra fast laser machined hydrophobic stainless steel surface for drag reduction in laminar flows. In: 11th International Symposium on Laser Precision Microfabrication (LPM 2010), 7 June 2010 - 10 June 2010 , Stuttgart.

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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
Item Type:Conference or Workshop Item
Faculty:
Engineering Technology (CTW)
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/79814
Conference URL:http://www.myeos.org/events/lpm2010
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