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  Active control of dispersion within a channel with flow and pulsating walls

Marbach, S., & Alim, K. (2019). Active control of dispersion within a channel with flow and pulsating walls. Physical Review Fluids, 4(11): 114202. doi:10.1103/PhysRevFluids.4.114202.

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Marbach, S., Author
Alim, Karen1, Author           
Affiliations:
1Max Planck Research Group Biological Physics and Morphogenesis, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2266692              

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 Abstract: Channels are fundamental building blocks from biophysics to soft robotics, often used to transport or separate solutes. As solute particles inevitably transverse between streamlines along the channel by molecular diffusion, the effective diffusion of the solute along the channel is enhanced, an effect known as Taylor dispersion. Here we investigate how the Taylor dispersion effect can be suppressed or enhanced in different settings. Specifically, we study the impact of flow profile and active or pulsating channel walls on Taylor dispersion. We derive closed analytic expressions for the effective dispersion equation in all considered scenarios providing hands-on effective dispersion parameters for a multitude of applications. In particular, we find that active channel walls may lead to three regimes of dispersion: either dispersion decrease by entropic slow down at small Peclet number, or by dispersion increase at large Peclet number dominated either by shuttle dispersion, or by Taylor dispersion. This improves our understanding of solute transport, e.g., in biological active systems such as blood flow, and opens a number of possibilities to control solute transport in artificial systems such as soft robotics.

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Language(s): eng - English
 Dates: 2019-11-152019
 Publication Status: Issued
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 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevFluids.4.114202
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Title: Physical Review Fluids
Source Genre: Journal
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Pages: 30 Volume / Issue: 4 (11) Sequence Number: 114202 Start / End Page: - Identifier: -