Abstract
In the surface filtration process with pores larger than the particle size, the formation of particle bridges plays a crucial role in the filter cake structure and the filtration efficiency throughout the filtration process. First, to understand the microscopic information required for the bridging mechanism, we use the two-way coupling of computational fluid dynamics (CFD)–discrete element method (DEM) to simulate the deposition characteristics of particles in the pores of ceramic membranes. Next, by dynamically observing the deposition morphology and bridging process of particles, the bridging mechanism was revealed at the level of a single hole. Then, we studied the influence of particle concentration and inlet velocity on the bridge erection process. The results show that the bridging function of particles runs through the clean filtration stage and the transition stage. Particle concentration and inlet flow rate have a crucial influence on the formation of particle bridges and filtration efficiency.
Highlights
Study of Bridging Mechanism ofWith rapid economic development, especially in the modern industry based on energy consumption, we suffer from air pollution problems [1]
During the initial stages of filtration, most of the particles pass through the filter media, and only a fraction of them are captured by the ceramic membrane, resulting in a slight increase in pressure drop
The deposited particles will bridge at the entrance of the filter medium channel so that the particles are blocked and deposited on the surface of the filter medium to form a filter cake, entering the filter cake filtration stage
Summary
Especially in the modern industry based on energy consumption, we suffer from air pollution problems [1]. Deshpande et al [22,23] simulated the flow characteristics of particles in a packed bed by the CFD-DEM bidirectional coupling method They studied the influence of monodisperse and monodisperse spherical particles on the filter cake during filtration under different flow conditions and the complex interdependence of particle sphericity, porosity, and pressure drop of filter cake with various fluid conditions. The simulation results are compared with the theoretical calculation model and previous experimental results, and the accuracy of the simulation results is verified In this project, we established a three-dimensional model of the ceram pores and used the CFD-DEM bidirectional coupling method to simulat mechanism of particles in the ceramic membrane pores, considering adhes ditionally, we measured macroscopic parameters such as pressure drop an ficiency and provided the microscopic information needed to understand mechanism. Model and Methods filter cake are analyzed in detail, and the effects of particle concentration and inlet flow rate on theNumerical bridging process are discussed
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