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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 23, 2019
Accepted January 20, 2020
Available online May 4, 2020

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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일정 전위 모드에서의 전기와류 불안정성에 대한 시간-분해 해석

Time-resolved Analysis for Electroconvective Instability under Potentiostatic Mode

이효민^†

Hyomin Lee^†

제주대학교 생명화학공학과, 63243 제주시 제주대학로 102

Department of Chemical and Biological Engineering, Jeju National University, 102 Jejudaehak-ro, Jeju-si, Jeju-do, 63243, Korea

fluid@jejunu.ac.kr

Korean Chemical Engineering Research, May 2020, 58(2), 319-324(6)
https://doi.org/10.9713/kcer.2020.58.2.319

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Abstract

전기와류 불안정성은 전기투석 장치, 갈바니 전지, 전해 전지 등의 이온-선택성 이동 현상계에서 발견되는 비선형 이동 현상이다. 이 불안정성은 이온-선택성 표면 근처 공간 전하층의 요동에 의해 발생하며, 불안정성의 발현은 물질전달 속도를 증가시켜 준다. 따라서 전기와류 불안정성은 물질 전달 측면에서 중요한 의미를 가진다. 최근의 실험적 기법들이 불안정성의 직접적 가시화를 가능하게 해주었으나, 실험적 한계점에 의해 불안정성의 원론적 연구는 제한된 영역에서만 이루어지고 있다. 본 연구에서는 일정 전위 모드에서의 전기와류 불안정성에 대한 수치 해석을 진행하여 전류-시간 곡선과 불안정성의 거동 간의 상관관계를 밝히고자 하였다. 시간-분해 해석을 통하여, 불안정성의 발달 거동을 SCL 형성 . 전기와류 불안정성의 성장 . 정상 상태 도달로 구분 지었다. 더불어, 인가 전위에 따른 전이 시간들의 크기 법칙 또한 수치적으로 유도하였다.

Electroconvective instability is a non-linear transport phenomenon which can be found in ion-selective transport system such as electrodialysis, Galvanic cell and electrolytic cell. The instability is triggered by the fluctuation of space charge layer in adjacent of ion-selective surface, leading to increase of mass transport rate. Thus, in the aspect of mass transport, the instability has an important meaning. Although recent experimental techniques have opened up an avenue to direct visualize the instability, fundamental investigations have been conducted in limited area due to several experimental limitations. In this work, the electroconvective instability under potentiostatic mode was solved by numerical method in order to demonstrate correlation between current-time curve and the instability behavior. By rigorous timeresolved analysis, the transition behaviors can be divided into three stages; formation of space charge layer - growth of electroconvective instability - steady state. Furthermore, scaling laws of transition time were numerically obtained according to applied voltage as well.

Keywords

Electroconvective instability Ion-selective transport Potentiostatic mode Time-resolved analysis Transition time

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