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http://dx.doi.org/10.9713/kcer.2021.59.4.626

Dynamics Transition of Electroconvective Instability Depending on Confinement Effect  

Lee, Seungha (Department of Chemical and Biological Engineering, Jeju National University)
Hyun, Cheol Heon (Department of Chemical and Biological Engineering, Jeju National University)
Lee, Hyomin (Department of Chemical and Biological Engineering, Jeju National University)
Publication Information
Korean Chemical Engineering Research / v.59, no.4, 2021 , pp. 626-631 More about this Journal
Abstract
One of the nonlinear electrokinetic phenomena around ion exchange membrane is electroconvective instability which can be found in various electrokinetic applications such as electrodialysis, electrochemical battery, microfluidic analysis platform, etc. Such instability acts as a positive transport mechanism for the electrodialysis via amplifying mass transport rate. On the other hands, in the electrochemical battery and the microfluidic applications, the instability provokes unwanted mass transport. In this research, to control the electroconvective instability, the onset of the instability was analyzed as a function of confinement effect as well as applied voltage. As a result, we figured out that the dynamic behavior of electroconvective instability transited as a sequence of stable regime - static regime - chaotic regime depending on the applied voltage and confinement effect. Furthermore, stability curves about the dynamic transition were numerically determined as well. Conclusively, the confinement effect on electroconvective instability can be applied for effective means to control the electrokinetic chaos.
Keywords
Electroconvective instability; Ion-exchange membrane; Confinement effect; Hele-Shaw approximation; Electrokinetic chaos;
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