- 作者： 黃定加; 蔡繁男
- 作者服務機構： 國立成功大學化工系
- 中文摘要：
本研究係由各種條件下電透析之極限電流密度之測定，以求Reynolds數，Schmidt數和
電透析槽形狀因素對於離子傳送速率之影響。
本實驗曾在各種Reynolds數，Schmidt數，電透析槽形狀因素及恆溫下，將電解液流入由
陽離子交換膜Selemion CMV與陰離子交換膜Selemion AMV所組成之平面流動電透析槽
，並由電壓一電流之測定曲線，求得各種條件下電透析之極限電流密度。
由層流範圍之實驗結果，得知在 25＜Re＜2000，344＜Sc＜2200，0.06＜de/ L＜0.36及
25 C恆溫下，使用0.03N NaCI溶液電透析時，離子傳送速率可用下列實驗式表示：（Nu）exp．
=3．58 Re0.329Sc0.392（de./L)0.354，顯示實驗結果與理論式所預測者相?合。
渦狀流動範圍時，Re對於離子傳送速率之影響，亦由在一定Sc, de/L及2000
狀電透析槽在渦狀流動下電透析之實驗式相符合。
r - 英文摘要： The effects of Reynolds number Re, Schmidt number Sc, and the shape factorof electrodialysis cell de/L, on the ionic mass transfer rate (Nu)exp. in ion exchangemembrane electrodialysis are obtained from the measurement of the limitingcurrent densities at various conditions. In this investigation, the electrolyte solu-tions are flown into a plane electrodialysis channel which is composed of anionexchange membrane Selemion AMV and cation exchange membrane Selemion CMV‧The limiting current densities of electrodialysis at constant temperature (25 C) andvarious Re, Sc, and de/L are measured from the voltage-current curves. Theexperimental results within laminar flow region show that the ionic mass trans-fer rate can be expressed by the empirical equation (Nu)exp．=3.58 Re0.329Sc0.392(de/L)0.354 in the range 25 Re〈2000, 344＜Sc〈2200, and 0.06＜de/L〈0.36 for 0.03 N NaCl solution at 25C．It is found that the experimental results arecoincident with the results predicted from the theoretical equation. The effects of Re on limiting current density in turbulent flow region are mea-sured at constant Sc and de/L in the range 2000＜Re＜2800. The ionic mass: tran-sfer rate can be expressed by (Nu)exp. =K Re0.78. This empirical equation issimilar to the equation obtained from fully developed turbulent mass transfer in anannulus electrodialysis cell．
- 中文關鍵字： --
- 英文關鍵字： --
