A Modeling Method for Dynamic Streaming Potential of Porous Media Converter
A technology of porous media and streaming potential, applied in the field of porous media, can solve the problems of increasing and less electrokinetic effect analysis
Active Publication Date: 2022-03-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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[0003] At present, the research on microfluidics and electrokinetic effects in porous media converters focuses on the study of steady-state models. However, the analysis of electrokinetic effects in dynamic flow fields is less
Moreover, most of the current research is based on the assumption of a thin electric double layer, that is, it is assumed that the thickness of the electric double layer is much smaller than the pore size of the porous medium. However, when the characteristics of the solution and the characteristic parameters of the porous medium change, the thickness of the electric double layer may increase. The electric layer assumption is no longer applicable, and the influence of the thickness of the electric double layer on the charge distribution needs to be considered
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[0076] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0077] A method for modeling the dynamic flow potential of a porous medium converter of the present invention uses a capillary bundle model to perform equivalent modeling of the porous medium converter, such as figure 1 shown. The porous media material contains a skeleton part and a void part inside, and the structure is complex, so it is difficult to directly conduct quantitative analysis on the internal dynamic flow potential. Therefore, a bundle of curved circular capillaries is used to equivalent it, that is, the capillary bundle of the porous media converter In the model, the radii of these capillaries obey a certain distribution law. Further, according to the particle size distribution of the microbeads in the porous medium converter, the radius distribution law of the non-uniform distribution is calculated, and then the equivalent average radius r ...
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The invention discloses a modeling method for the dynamic streaming potential of a porous medium converter. When establishing the dynamic streaming potential model of a porous medium converter, the influence of the thickness of the electric double layer on the distribution of current and potential is considered. Due to the type of solution and Concentration is an important factor affecting the thickness of the electric double layer, so this model can be applied to the analysis of different solution properties; this paper establishes a dynamic streaming potential model, which makes it possible to use this model to analyze dynamic characteristics, such as when different frequency inputs, the streaming potential The change of the coupling coefficient, which is of great significance for the performance analysis of the sensor using the porous media converter as an important sensitive element; this model involves multiple parameters of the porous media converter, such as the equivalent average radius of the capillary, so this model can be used The influence of changing parameters on the coupling coefficient of flow potential in a porous media converter is analyzed.
Description
technical field [0001] The invention relates to the technical field of porous media, in particular to a modeling method for the dynamic flow potential of a porous media converter. Background technique [0002] The porous medium is sintered by solid microbeads. The internal structure includes the microbead skeleton and the gap between the microbeads. It has the characteristics of small gap size and large specific surface area. The fluid moves in the form of seepage inside. According to the interface electric double layer effect, when the solid and liquid surfaces are in contact, the solid and liquid phases will form charges with equal and opposite electric charges. When the fluid flows through, the charges generated in the pores due to the interface electric double layer effect will be Flowing potential and flowing current are formed when the fluid moves. This process is called the electrokinetic effect. Therefore, the porous media material can be used as a converter to conve...
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IPC IPC(8): G06F30/20
Inventor 王美玲王思劢明丽宁可
Owner BEIJING INSTITUTE OF TECHNOLOGYGY