考研 化工原理 必备课件第三章 机械分离与固体流态化（PubMed Chemical Principle courseware, the third chapter of mechanical separation and solid fluidization）.docVIP

考研 化工原理 必备课件第三章 机械分离与固体流态化（PubMed Chemical Principle courseware, the third chapter of mechanical separation and solid fluidization） PubMed Chemical Principle courseware, the third chapter of mechanical separation and solid fluidization.Txt This paper consists of 821240550 contributions Ppt documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view. The third chapter is mechanical separation and fluidization of solids 3.1, particle and granular bed characteristics, 3.2, 3.3, 3.4, 3.5 sedimentation process, filtration centrifuge, solid fluidization Characteristics of 3.1 particle and granular bed (1) the porosity of a fixed bed in a fixed bed is expressed in terms of porosity. The porosity is defined as follows: E = Void volume, bed volume, V, particle size, V, v = 1, bed volume, bed volume, V, V The size of epsilon reflects the degree of tightness of the particles in the bed and has a great influence on the resistance of fluid flow Epsilon sigma down, f = H. Epsilon 1 . Characteristics of 3.1 particle and granular bed (2) integral rate of free cross section of bed A = A0 . A flow cross-sectional area, bed cross-sectional area, A- particles accounted for an average cross-sectional area of A, P = 1, P, bed cross-sectional area, bed cross-sectional area, A, A What is the relationship between airborne rate and the rate of free bed fraction in bed? It is assumed that the bed particles are uniformly stacked (i.e., the bed is isotropic). Imagine the force from the bed to the middle of the uniform compaction, the particles are pressed to the middle diameter of L long column (the column is equipped with voids). Epsilon = 1? V, D = 1, 4 = 1, 1, PI, 2, V, D, D, L, 4 PI D1 L Two Two 2, D12, AP, D1, 4, A0 = 1, = 1, = 1, PI, 2, A, D, D 4 PI Therefore, the uniform accumulation of particles on the bed (isotropic bed) is numerically Epsilon = A0 Characteristics of 3.1 particle and granular bed (3