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Abstract: Surface effects become important in microfluidic setups because the surfaceto volume ratio becomes large. In such setups the surface roughness is not anylonger small compared to the length scale of the system and the wettingproperties of the wall have an important influence on the flow. However, theknowledge about the interplay of surface roughness and hydrophobicfluid-surface interaction is still very limited because these properties cannotbe decoupled easily in experiments.We investigate the problem by means of lattice Boltzmann LB simulations ofrough microchannels with a tunable fluid-wall interaction. We introduce an``effective no-slip plane- at an intermediate position between peaks andvalleys of the surface and observe how the position of the wall may change dueto surface roughness and hydrophobic interactions.We find that the position of the effective wall, in the case of a Gaussiandistributed roughness depends linearly on the width of the distribution.Further we are able to show that roughness creates a non-linear effect on theslip length for hydrophobic boundaries.



Autor: Christian Kunert, Jens Harting

Fuente: https://arxiv.org/







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