Measurement of permeability of microfluidic porous media with finite-sized colloidal tracers
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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.
KeywordsParticle Velocity Microfluidic Device Outer Segment Microfluidic Channel Particle Tracking Velocimetry
We would like to thank Valentin Blickle, Hans-Jürgen Kümmerer and Gerd E. Schröder-Turk for inspiring discussions.
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