Non-uniform electro-osmotic flow drives fluid–structure instability
Boyko E., Eshel R., Gat A.D. & Bercovici M. (2020)
Physical Review Letters 124, 024501 (Main_pdf, SI_pdf, Link to Journal)
| We demonstrate the existence of a fluid-structure instability arising from the interaction of electro-osmotic flow with an elastic substrate. Considering the case of flow within a soft fluidic chamber, we show that above a certain electric field threshold, negative gauge pressure induced by electro-osmotic flow causes the collapse of its elastic walls. We combine experiments and theoretical analysis to elucidate the underlying mechanism for instability and identify several distinct dynamic regimes. The understanding of this instability is important for the design of electrokinetic systems containing soft elements. | . |
see also
Boyko, E., Eshel, R., Gommed, K., Gat, A.D. & Bercovici, M. (2019) “Elastohydrodynamics of a pre-stretched finite elastic sheet lubricated by a thin viscous film with application to microfluidic soft-actuators,” J. Fluid Mech. 862, 732-752. (pdf).
Boyko, E., Bercovici, M. & Gat A.D. (2017) “Viscous-elastic dynamics of power-law fluids within an elastic cylinder,” Physical Review Fluids 2, 073301. (pdf_main, pdf_supp)
Rubin, S., Tulchinsky, A., Gat A.D. & Bercovici, M. (2017) “Elastic deformations driven by non-uniform lubrication flows,” J. Fluid Mech. 812, 841-865. (pdf)
Boyko, E., Bercovici, M. & Gat A.D. (2016) “Flow of Power-Law Liquids in a Hele-Shaw Cell Driven by Non-Uniform Electroosmotic Slip in the Case of Strong Depletion,” J. Fluid Mech. 807, 235-257 (pdf).
Tulchinsky A. & Gat A.D. (2016) “Transient Dynamics of Elastic Hele-Shaw Cell Due to External Forces with Application to Impulse Mitigation,” J. Fluid Mech. 800, 517-530. (pdf)