Fluidization and wall slip of soft-glassy materials by controlled surface roughness
arXiv:1611.01980 · doi:10.1103/PhysRevE.95.052602
Abstract
The motion of soft-glassy materials (SGM) in a confined geometry is strongly impacted by surface roughness. However, the effect of the spatial distribution of the roughness remains poorly understood from a more quantitative viewpoint. Here we present a comprehensive study of concentrated emulsions flowing in microfluidic channels, one wall of which is patterned with micron-size equally spaced grooves oriented perpendicularly to the flow direction. We show that roughness-induced fluidization can be quantitatively tailored by systematically changing both the width and separation of the grooves. We find that a simple scaling law describes such fluidization as a function of the density of grooves, suggesting common scenarios for droplet trapping and release. Numerical simulations confirm these views and are used to elucidate the relation between fluidization and the rate of plastic rearrangements.
arXiv comment4 Figures. Supplementary Material. 2 Movies
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- TLBfind: a Thermal Lattice Boltzmann code for concentrated emulsions with FINite-size Droplets
- On the impact of controlled wall roughness shape on the flow of a soft-material
- Measuring arrangement and size distributions of flowing droplets in microchannels through deep learning
- Wall slip and bulk yielding in soft particle suspensions
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