The calculation of κ in the Electrostatics Model

Alice Sun

I tried to estimate the value of k, but there is a big difference between the calculated value and the particle electrostatic force derived from the simulation. I am confused about the meaning of "The last term is the local charge concentration (where n is the number of particles of charge z)".

For a testing case containing one large particle (radius 0.5 mm; charge: 2e-11 C) and 5 small particles (radius 0.2 mm; charge: -5e-12 C), the screening distance is 10Rmin, how to calculate the values of n and z ?

 

Stephen Cole

Hi Alice,

 

I'm not sure myself but it may be detailed more in the orignal refrences:

Casper M.J. (1997) Physical chemistry of surfaces (3rd). Chapter5. Adamson A.W. and Gast A.P., Editors. John Wiley & Sons, Inc.

Hogue M.D.  et al. (2008) Calculating the trajectories of triboelectrically charged particles using Discrete Element Modeling (DEM). Journal of Electrostatics, 66(1): p. 32-38. http://dx.doi.org/10.1016/j.elstat.2007.08.007

 

Regards

Stephen