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Issue 25, 2018
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Hydrodynamic interaction induced breakdown of the state properties of active fluids

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Abstract

The mechanical pressure of active fluids in which swimmers are modeled by soft run-and-tumble spheres is investigated by dissipative particle dynamics simulations. The incremental pressure (Π) with respect to the system pressure with inactive swimmers comprises the direct contribution of the swimmers (π) and the indirect contribution of fluids associated with hydrodynamic interactions (HIs). The pressure can be determined from the bulk and confining wall and the former is always less than the latter. The π of dilute active dispersions is proportional to their active diffusivity while Π grows generally with propulsive force and run time. However, Π is always substantially less than π because of negative contributions to pressure by HIs. The wall pressure depends on the swimmer–wall interactions, verifying that pressure is not a state function for active spheres due to the HIs. Owing to the distinct flow patterns, Π varies with the swim-type (pusher and puller) subject to the same run-and-tumble parameters at high concentrations.

Graphical abstract: Hydrodynamic interaction induced breakdown of the state properties of active fluids

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Publication details

The article was received on 30 Apr 2018, accepted on 28 May 2018 and first published on 29 May 2018


Article type: Paper
DOI: 10.1039/C8SM00881G
Citation: Soft Matter, 2018,14, 5319-5326
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    Hydrodynamic interaction induced breakdown of the state properties of active fluids

    Y. Chen, Z. Wang, K. Chu, H. Chen, Y. Sheng and H. Tsao, Soft Matter, 2018, 14, 5319
    DOI: 10.1039/C8SM00881G

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