Comments on: 如何模拟离子交换膜和唐南电位 - //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials 发布博客 Wed, 28 Aug 2024 00:35:48 +0000 hourly 1 https://wordpress.org/?v=5.7 By: D 陈 //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials/#comment-34633 Wed, 28 Aug 2024 00:35:48 +0000 http://cn.staging.comsol.com/blogs?p=194341#comment-34633 In reply to Yi Fan Wang.

O(∩_∩)O好的

]]> By: Yi Fan Wang //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials/#comment-34593 Tue, 27 Aug 2024 07:45:24 +0000 http://cn.staging.comsol.com/blogs?p=194341#comment-34593 In reply to D 陈.

是的，您可以参阅案例“//www.denkrieger.com/model/vanadium-redox-flow-battery-14153”。其中使用了唐南电位的边界条件，并且施加了1000A/[m^(2)]的电流。

]]> By: D 陈 //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials/#comment-34503 Thu, 22 Aug 2024 02:25:56 +0000 http://cn.staging.comsol.com/blogs?p=194341#comment-34503 对了，我还想请问一下，根据文章中的推导过程，唐南平衡似乎也适用于非平衡态（比如VFB模型中有一定大小的电流流过的情况）？

]]> By: D 陈 //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials/#comment-34493 Thu, 22 Aug 2024 02:01:45 +0000 http://cn.staging.comsol.com/blogs?p=194341#comment-34493 In reply to yongchao wang.

好的谢啦

]]> By: yongchao wang //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials/#comment-34453 Wed, 21 Aug 2024 02:46:41 +0000 http://cn.staging.comsol.com/blogs?p=194341#comment-34453 In reply to D 陈.

一般的“来自电中性”的物质选择原则，一般选择惰性、不参与反应的物质，浓度占比比较大的物质，模型中在膜中考虑了硫酸的自电离过程，所以认为膜中包含SO42-，如果您认为膜中不包含SO42-可以将该物质在“离子交换膜”接口中去除，并且将电离反应禁用。

]]> By: D 陈 //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials/#comment-34323 Fri, 16 Aug 2024 03:40:16 +0000 http://cn.staging.comsol.com/blogs?p=194341#comment-34323 您好，我想请问一下，在三次电流分布中的“来自电中性”的物质，应该按什么标准选择呢？
比如对于全钒液流电池，隔膜是阳离子交换膜，文献10.1149/2.017209jes提到“SO42− is not present in the membrane because it is assumed that the dissociation of HSO4− is completely suppressed by the presence of the fixed charge in the membrane.”那HSO4-可以认为是隔膜中唯一的阴离子了。但是为什么案例库中的全钒液流电池的“三次电流分布，能斯特-普朗克（离子交换膜）”中的“来自电中性”仍然选择了SO42-呢？
我也试了一下改成HSO4−，案例结果只有很微小的变化。是不是“来自电中性”选择任意一个含量微小的物质都可以呢？

]]> By: yongchao wang //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials/#comment-32193 Tue, 18 Jun 2024 07:39:20 +0000 http://cn.staging.comsol.com/blogs?p=194341#comment-32193 In reply to R T.

出现警告的原因是由于“二次电流分布”中，未给定参考电位，在“编译方程时”，会报“无限多解”的警告，这个不影响后续计算，因为二次电流分布与另外两个三次电流分布进行耦合，会得到唯一解；这种建模方式可以扩展到三维。

]]> By: R T //www.denkrieger.com/blogs/how-to-model-ion-exchange-membranes-and-donnan-potentials/#comment-31783 Fri, 07 Jun 2024 08:58:51 +0000 http://cn.staging.comsol.com/blogs?p=194341#comment-31783 Why is there a warning stating “Secondary current distribution has undefined potential conditions” after performing calculations in a fully blocked model? Is it still possible to use ion exchange membrane boundary nodes to couple the tertiary current distribution with the secondary current distribution in two-dimensional or three-dimensional models?

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