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- W1918783780 abstract "Due to large surface to volume ratios in microfluidic setups, the roughness of channel surfaces must not be neglected since it is not any longer small compared to the length scale of the system. In addition, the wetting properties of the wall have an important influence on the flow. Even though these effects are getting more and more important for industrial and scientific applications, the knowledge about the interplay of surface roughness and hydrophobic fluid-surface interaction is still very limited because these properties cannot be decoupled easily in experiments. We investigate the problem by means of lattice Boltzmann (LB) simulations of rough microchannels with tunable fluid-wall interaction. We introduce an no-slip plane'' at an intermediate position between peaks and valleys of the surface and observe how the position of the wall may change due to surface roughness and hydrophobic interactions. We find that the position of the effective wall, in the case of a Gaussian distributed roughness depends linearly on the width of the distribution. Further we are able to show that roughness creates a non-linear effect on the slip length for hydrophobic boundaries." @default.
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- W1918783780 date "2008-01-01" @default.
- W1918783780 modified "2023-09-23" @default.
- W1918783780 title "Boundary effects in microfluidic setups" @default.
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