基于多孔介质理论的折褶滤芯数学模型研究
发布时间：2018-08-15 15:52
【摘要】：折褶滤芯过滤器以其颗粒收集效率高,使用寿命长,制造工艺流程简单,易清洗更换等优点广泛应用于各种自动化、医药卫生、原子能工业和压缩机等领域。但是对于流体介质为液体的折褶滤芯数学模型研究较少。因此,研究流体在多孔介质中的流动和杂质颗粒在流体介质中的流动规律,从而研究折褶滤芯渗透率等参数的数学模型尤为重要。这对于今后折褶滤芯的设计和制造具有重要作用。本文利用D2Q9格子玻尔兹曼模型研究折褶滤芯的渗透率。利用滤芯折褶率数学模型研究折褶滤芯两侧压力降和周围流场变化情况。并且运用数学语言描述杂质颗粒的布朗运动和对流运动以及自身重力导致的杂质颗粒沉积现象。(1)介绍格子玻尔兹曼离散方法和其D2Q9速度离散模型以及分子动理论基本原理。明确了格子玻尔兹曼方法本质是粒子之间的碰撞与迁移,利用原理为动量守恒、能量守恒和质量守恒。利用D2Q9格子玻尔兹曼模型进行渗透率公式的分析与验证。(2)介绍计算流体力学(CFD),建立表示折褶高与折褶宽之间关系的滤芯折褶率数学模型。研究具有不同折褶率滤芯两侧压力降变化和周围的流场变化情况。(3)根据滤芯能够完成过滤工作的本质是杂质颗粒的对流和扩散运动(布朗运动)。运用数学语言描述了杂质颗粒在其它杂质颗粒和自身重力作用下造成的在多孔介质表面和内部的沉积现象。研究具有杂质颗粒沉积层的V型折褶滤芯两侧压力降变化和流场变化情况。
[Abstract]:Folded filter is widely used in many fields, such as automation, medicine, hygiene, atomic energy industry and compressor, because of its advantages of high particle collection efficiency, long service life, simple manufacturing process and easy cleaning and replacement. It is very important to study the mathematical model of the parameters such as the permeability of folded filter element, which is very important for the design and manufacture of folded filter element in the future. In this paper, the permeability of folded filter element is studied by using D2Q9 lattice Boltzmann model. The pressure drop on both sides of the folded filter and the variation of the flow field around it are studied. The Brownian motion and convection of impurity particles and the deposition of impurity particles caused by gravity are described by mathematical language. (1) The lattice Boltzmann discretization method, its D2Q9 velocity discretization model and the basic principle of molecular motion theory are introduced. Lattice Boltzmann method is essentially the collision and migration between particles. The principle is momentum conservation, energy conservation and mass conservation. The permeability formula is analyzed and verified by using D2Q9 lattice Boltzmann model. (2) Computational Fluid Dynamics (CFD) is introduced to establish the mathematical model of filter core folding, which shows the relationship between folding height and folding width. (3) According to the fact that the filter element can complete the filtering work is the convection and diffusion movement of impurity particles (Brownian motion). Mathematical language is used to describe the porous media caused by impurity particles under the action of other impurity particles and gravity. The pressure drop and flow field on both sides of V-shaped folded filter core with impurity grain deposits are studied.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.85
本文编号：2184684
[Abstract]:Folded filter is widely used in many fields, such as automation, medicine, hygiene, atomic energy industry and compressor, because of its advantages of high particle collection efficiency, long service life, simple manufacturing process and easy cleaning and replacement. It is very important to study the mathematical model of the parameters such as the permeability of folded filter element, which is very important for the design and manufacture of folded filter element in the future. In this paper, the permeability of folded filter element is studied by using D2Q9 lattice Boltzmann model. The pressure drop on both sides of the folded filter and the variation of the flow field around it are studied. The Brownian motion and convection of impurity particles and the deposition of impurity particles caused by gravity are described by mathematical language. (1) The lattice Boltzmann discretization method, its D2Q9 velocity discretization model and the basic principle of molecular motion theory are introduced. Lattice Boltzmann method is essentially the collision and migration between particles. The principle is momentum conservation, energy conservation and mass conservation. The permeability formula is analyzed and verified by using D2Q9 lattice Boltzmann model. (2) Computational Fluid Dynamics (CFD) is introduced to establish the mathematical model of filter core folding, which shows the relationship between folding height and folding width. (3) According to the fact that the filter element can complete the filtering work is the convection and diffusion movement of impurity particles (Brownian motion). Mathematical language is used to describe the porous media caused by impurity particles under the action of other impurity particles and gravity. The pressure drop and flow field on both sides of V-shaped folded filter core with impurity grain deposits are studied.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.85
【参考文献】
相关期刊论文 前1条
1 巴鹏;刘彭;欧周华;张鹏飞;;褶型滤芯过滤阻力与结构参数关系的研究[J];液压与气动;2012年10期
，本文编号：2184684
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