Study On The Flow Resistance Of Porous Media Based On Pore Throat Model And Flow Around Model

Porous media,on the macro level,are solids that do not fill every part of the interior of the frame closely,and are everywhere around us,piles of wood,puffs of soil,down feathers inside our jackets,the materials on which we make our clothes,and so on.In addition,the trisection of porous media is common in the production of various links in industry and agriculture,so it is necessary to study the trisection of porous media.In this paper,the problem of flow resistance loss in porous media is mainly studied.In fluid mechanics,the flow resistance itself is a cross-century problem,especially the turbulence problem,and it is more difficult to study the flow loss through porous media on the basis of porous media.Due to the randomness,irregularity and complexity of boundary effects of porous media,the influence on the flow mechanism of incoming flow has been difficult to study.Thirdly,due to the complexity of the structure of porous media itself,it is very difficult to observe the flow field in experimental research.Even for porous media made of transparent material,the observation error of experimental observation will be caused due to the difference of refractive index when the fluid flows through the porous media.In the study of flow resistance in porous media,the traditional theory and the latest fractal theory are mainly used in this paper.In the classical study of porous media resistance models,there are two main models: pipe flow and flow around.In this paper,the inertial resistance of porous media flow is treated as the flow resistance,so capillary tube flow model and cross-drain flow model are established,and the traditional solutions and fractal solutions of flow resistance of porous media are derived respectively on the basis of these models.Secondly,the flow around model was improved by adding the pore throat model,and the local resistance calculation was added due to the effect of expansion and contraction caused by the change of pore throat radius.The traditional and fractal solutions derived in this paper do not contain any empirical constants and each parameter has definite physical significance.Then in this paper,27 groups of experimental data were applied to the derivation company for comparison and verification,and the classical Ergenequation was combined for comparison and verification.The conclusion was that the derived equation was closer to the experimental data than the Ergun equation,with a wide range of application,indicating that the model was scientific and reasonable.Then for the pore-throat model,it is found that the flow resistance is not negligible under low Reynolds number.The cross-drain flow model,capillary flow model and pore throat model are three simple models which can be used to study the flow resistance of porous media,but it still needs a lot of work to calculate the flow resistance of all types of porous media.This paper is only a small step in the study of flow resistance in porous media,and there is still a long way to go.