Roughness-dependent clogging of particle suspensions flowing into a constriction
| Autor: | Gustaf Mårtensson, Chiao-Peng Hsu, Hasan Emre Baysal, Görel Wirenborn, Lisa Prahl Wittberg, Lucio Isa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Microchannel
Materials science 02 engineering and technology General Chemistry Surface finish Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences law.invention Volumetric flow rate ddc Clogging Flow velocity law 0103 physical sciences Surface roughness Particle 010306 general physics 0210 nano-technology Filtration |
| Zdroj: | Soft Matter, 17 (31) |
| ISSN: | 1744-683X 1744-6848 |
| DOI: | 10.3929/ethz-b-000500208 |
| Popis: | When concentrated particle suspensions flow into a constricting channel, the suspended particles may either smoothly flow through the constriction or jam and clog the channel. These clogging events are typically detrimental to technological processes, such as in the printing of dense pastes or in filtration, but can also be exploited in micro-separation applications. Many studies have to date focused on important parameters influencing the occurrence of clogs, such as flow velocity, particle concentration, and channel geometry. However, the investigation of the role played by the particle surface properties has surprisingly received little attention so far. Here, we study the effect of surface roughness on the clogging of suspensions of silica particles under pressure-driven flows along a microchannel presenting a constriction. We synthesize micron-sized particles with uniform surface chemistry and tunable roughness and determine the occurrence of clogging events as a function of velocity and volume fraction for a given surface topography. Our results show that there is a clear correlation between surface roughness and flow rate, indicating that rougher particles are more likely to jam at the constriction for slower flows. These findings identify surface roughness as an essential parameter to consider in the formulation of particulate suspensions for applications where clogging plays an important role. Soft Matter, 17 (31) ISSN:1744-683X ISSN:1744-6848 |
| Databáze: | OpenAIRE |
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