Shear-induced transport of a particle layer along a porous wall

✍ Scribed by Robert H. Davis; David T. Leighton

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 873 KB
• Volume: 42
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(87)85057-1

✦ Synopsis

A theory is presented which describes the transport of a concentrated layer of particles along a porous wall under laminar flow conditions. A shear-induced hydrodynamic diffusion mechanism is proposed to describe the lateral migration ofparticles away from the porous wall as the layer is sheared. At steady state. the particie diffusion within the layer is balanced by the convective flux of particles toward the poro& wali due to the fluid Bow into the wall. This model predicts the nonlinear velocity and concentration profiles within the sheared particle layer, as well as the layer thickness and the wall doncentration. In addition, a criterion is found for predicting whether or not a stagnant particle layer will form on the porous wall. The application of this theory to crossflow microfiltration is discussed.