摘要
为定量研究层状复合体系介电谱,基于微元法思想,提出了数值模拟该体系介电谱的方法,即将体系内电参数非均匀分布层分割为若干个电参数均匀分布的薄层,通过求解体系的复电导而得到体系的介电谱的数值解。以层内电导率和介电常数呈线性分布的介电谱为例,研究结果表明,数值模拟结果与理论解析结果一致。浓差极化层的压力驱动膜分离体系的模拟显示,该数值模拟方法可以研究复杂电参数分布情况时体系的介电谱,并发现该体系电导的频率依存性受原料液通量变化影响显著,体系弛豫个数随着通量的增加而减少。
The dielectric spectroscopy of multi-layer composite systems was calculated using the differential element method. The simulation separated the layers with non-uniform distributed electrical properties into multiple sub-layers which were thin enough to treat their electrical properties as constants. The dielectric spectroscopy was then obtained through the complex conductance. The simulated dielectric spectroscopy of a system with a linearly distributed permittivity and conductivity agrees well with theoretical results. Simulation of a pressurized membrane separation dielectric spectroscopy shows that this method can model the dielectric spectroscopy of complex systems with the flow of the bulk solution significantly influencing the frequency dependency of the conductance and the system dielectric relaxation decreasing with the increasing flow.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第9期1565-1568,共4页
Journal of Tsinghua University(Science and Technology)
关键词
介电谱
数值模拟
层状复合体系
dielectric spectroscopy
numerical simulations layered composite system
