Modeling method for dynamic flow potential of porous medium converter
A technology of porous media and flowing potential, applied in the field of porous media, can solve the problems of less analysis and increase of electrokinetic effect, etc.
Active Publication Date: 2020-07-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[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 The electric layer assumption is no longer applicable, and the influence of the thickness of the electric double layer on the charge distribution needs to be considered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 dynamic flow potential of a porous medium converter. When the dynamic flow potential model of the porous medium converter is established, the influence ofthe thickness of double electric layers on current and potential distribution is considered, and the dynamic flow potential model can be suitable for analysis under different solution properties dueto the fact that the type and the concentration of the solution are important factors influencing the thickness of the double electric layers. According to the modeling method, a dynamic flow potential model is established, so that the model can be utilized to analyze dynamic properties, such as changes of flow potential coupling coefficients when different frequencies are input, and the dynamic flow potential model is of great significance to sensor performance analysis using the porous medium converter as an important sensitive element; and the dynamic flow potential model relates to a plurality of parameters of the porous medium converter, such as a capillary equivalent average radius, so that the dynamic flow potential model can be utilized to analyze the influence of the parameter change on a flow potential coupling coefficient of the porous medium converter.
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