전해질 용액에서 자연대류에 의한 물질전달

이종대; 최창균

HWAHAK KONGHAK, Vol.30, No.6, 692-699, December, 1992

Export Citation

전해질 용액에서 자연대류에 의한 물질전달

Mass Transfer by Natural Convection in an Electrolytic Solution

이종대, 최창균

초록

황산구리-황산용액 중의 구리이온이 구리전극에 도금되는 실험에서 자연대류 발생시점과 물질전달특성을 조사하기 위하여 한계전류기법이 적용되었다. 실험결과로부터 2000≤Sc≤3000, 10⁸≤Re≤10¹²인 범위에서 무차원 임계시간과 Rayleigh수와의 상관관계를 구하였으며, 실험에서 얻은 임계시간은 등온가열시 얻은 임계시간보다 4배 정도 큼을 알 수 있었다. 이러한 차이는 열전달에서의 기존의 실험결과들과 비교할 때 나타난 경향과 유사하다. 전기도금계에서 물질전달 상관식은 본 연구에서 얻은 실험결과 뿐만아니라 기존의 실험결과들과 잘 일치하였다.

In experimental electroplating copper ion on copper electrodes from CuSO₄-H₂SO₄ solution, the limiting current techniique was used in order to investigate the critical time of natural convection and charac-teristics of mass transfer. A correlation of the critical time vs. the Rayleigh number was depicted experimental-ly for 2000≤Sc≤3000 and 10⁸≤Ra≤10¹². It is found that experimental values of the critical time are about four times larger than theoretical values in the isothermal heating system. This trend is consistent with that of heat transfer. The present mass transfer correlation represents favorably not only the experimental data of this study but also the existing experimental data.

[References]

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[21] Wragg AA, Sedahmed GH, El-abd MZ, Mansour IAS, Ahmed AM, J. Appl. Electrochem., 9, 1 (1979)