Direct Numerical Simulation of the Settling of a Charged Colloidal Particle
In many industrial processes it is necessary to control the interactions between particles and the ambient electrolyte in which they are dispersed. In this paper we consider the sedimentation of a single charged colloidal particle in a Newtonian electrolyte to study the basic physical effects of this process. We investigate the settling of the particle by direct numerical simulation. This approach finally leads to the Stokes-Poisson-Nernst-Planck system, a system of coupled partial differential equations. For the numerical approximation of the solution we use the finite element method. We show that the settling velocity does not solely depend on the ion concentration of the electrolyte, but also has a significant dependence on the particle Reynolds number. In the case of small particle Reynolds numbers our results are in good agreement with the existing literature. We have further developed a new zeta potential expansion that is capable of describing the whole range of particle Reynolds numbers in the Stokes limit.
Sedimentation Electrochemical Double Layer Zeta Potential Expansion
Florian Keller Markus Feist Willy Dorfler Hermann Nirschl
Institut fttr Mechanische Verfahrenstechnik und Mechanik, Universitat Karlsruhe (TH), Germany Institut fur Angewandte und Numerische Mathematik, Universitat Karlsruhe (TH), Germany
国际会议
西安
英文
781-788
2009-07-11（万方平台首次上网日期，不代表论文的发表时间）