Please use this identifier to cite or link to this item:
|Title:||Boundary effect on slow motion of a composite sphere perpendicular to two parallel impermeable plates|
|Authors:||Chen, S.B. |
|Citation:||Chen, S.B., Ye, X. (2000-07). Boundary effect on slow motion of a composite sphere perpendicular to two parallel impermeable plates. Chemical Engineering Science 55 (13) : 2441-2453. ScholarBank@NUS Repository. https://doi.org/10.1016/S0009-2509(99)00509-6|
|Abstract:||The boundary effect on the perpendicular motion of a composite sphere towards a plane wall or between two parallel plates is investigated under the creeping flow conditions. The composite particle consists of a solid core and a porous shell. No restriction is placed on the shell thickness relative to the core size. The fluid flow inside the porous layer is governed by the Brinkman equation. A boundary collocation method is used to analyze the general case where the shell thickness and separation distance between the particle and the wall can be arbitrary. A lubrication theory is also employed to examine the special case of a particle with a thin permeable layer in near contact with a single plane. A good agreement between the results from both methods is attained. It is found that the hydrodynamic effect of the boundaries on the drag force experienced by a composite sphere or a porous one is weaker than that by a solid particle. While the drag force of a porous particle having a low to moderate permeability is a monotonic, decreasing function of the separation distance, a weak maximum drag may occur for a sphere with a very high permeability at a certain distance from the wall. This behavior agrees qualitatively with what Payatakes and Dassios (1987, Chemical Engineering Communications, 58, 119-138) and Burganos, Michalopoulou, Dassios and Payatakes (1992, Chemical Engineering Science, 117, 85-88) discovered using Darcy's law. (C) 2000 Elsevier Science Ltd. All rights reserved.|
|Source Title:||Chemical Engineering Science|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Nov 13, 2018
WEB OF SCIENCETM
checked on Nov 5, 2018
checked on Nov 10, 2018
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.