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AC electroosmosis modeling problems
Posted 10 avr. 2017, 05:02 UTC−4 Low-Frequency Electromagnetics, Microfluidics 1 Reply
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I’ve been trying to rebuild Green’s 2D AC-electroosmosis model on comsol.
I use the weak form mode(w) to solve the laplace equation with pde boundary conditions.
The results of electric field are what i expected but the fluid field velocities are zero everywhere.
(1) The models i use:
Weak Form PDE(w) & Laminar flow(spf)
(2) The equations of the Weak Form PDE(w) model:
(i) Weak form equation: weak = -test(phix)*phix-test(phiy)*phiy
(ii) Weak contribution(on electrodes): -(i*ω*C/σ)*test(phi)*(phi-V)
test(phi) is the test function for electric potential “phi”
test(phix) is the test function for tangential electric field “phix”
(3) The boundary condition of the Laminar flow(spf) model:
Slip Velocity (on electrodes)
u = u_slip = -(eΛ/4η)*pd(abs(phi-V)^2, x)
The equations are derived from Green’s article.
Any advice for solving the fluid field problem would be great.
Thanks for your attention.
Reference: N. G. Green, A. Ramos, A. González, H. Morgan, and A. Castellanos,
Phys. Rev. E 66, 026305 – Published 19 August 2002.
journals.aps.org/pre/abstract/10.1103/PhysRevE.66.026305
Hello Eric Tseng
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Do you solve your problems?
Best regards