Measurement of permeability of microfluidic porous media with finite-sized colloidal tracers |
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Authors: | Christian Scholz Frank Wirner Yujie Li Clemens Bechinger |
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Institution: | 1. Physikalisches Institut, Universit?t Stuttgart, 70569, Stuttgart, Germany
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Abstract: | We present two methods how the permeability in porous microstructures can be experimentally obtained from particle tracking velocimetry of finite-sized colloidal particles suspended in a liquid. The first method employs additional unpatterned reference channels where the liquid flow can be calculated theoretically and a relationship between the velocity of the particles and the liquid is obtained. The second method takes advantage of a time-dependent pressure drop that leads to an exponential decrease in the particle velocity inside a porous structure. From the corresponding decay time, the permeability can be calculated independently of the particle size. Both methods lead to results comparable with permeabilities derived from numerical simulations. |
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