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Experiments and numerical simulations show how colloidal particles can be trapped permanently in merging flow channels. When two merging colloidal streams contain different solutes, interactions between the particles, solutes, channel wall, and the inlet fluid flow induce a near-wall vortex that leads to stable particle trapping. A unique particle trapping mechanism, potentially found in a wide range of common flow systems, is documented and characterized.
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Shin et al. (2020) studied this question.
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