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Hi: need help on electro-rotation studies

Posted 18 mar 2013, 23:45 GMT-4 Version 4.3a 2 Replies

Prateek Benhal
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Hi I work on electro-rotation studies through dielectrophoresis(DEP).

Problem involves lot of variables, however I would like to know a way to obtain rotational simulation due to DEP?

Currently we got electromechanics which comes close enough but its hard to solve any electro-rotation problems.

Attached is the file consisting of model along with boundary conditions, basically DEP torque is dependent upon frequency of the applied field, complex permittivity and conductivity of the material and the surrounding medium.

I cant solve time dependent study because time goes to constant/ singularity due to the overlapping of phase varying AC sine waves. If I want to use frequency domain study then I dont know how to define the time-frequency varying voltage!! I cant use waveform in frequency study because now, voltage is a function of frequency instead of time like sine(2*pi*freq*t+phase).

Please guide me on this.
Thanks with Regards
Prateek Benhal
PhD candidate, Department of Mechanical Engineering
Division of applied biotechnology and micro-robotics
University of Canterbury, NZ
prateek.benhal@pg.canterbury.ac.nz
Phone: +64-3-364-2987 7228(ext.)
2 Replies Last Post 8 mag 2013, 21:39 GMT-4
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Hello Prateek Benhal

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Gilbert Jiang
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Posted: 1 decade ago 27 apr 2013, 11:56 GMT-4
Hi Prateek,

I am working on the same problem as well. So far I can only get the potential distribution of the spherical particle under a rotational AC field. By the way, my model is 3D. I've looked at your model but I am not quite sure why it does not converge. Are you having any progress?

Gilbert
Hi Prateek, I am working on the same problem as well. So far I can only get the potential distribution of the spherical particle under a rotational AC field. By the way, my model is 3D. I've looked at your model but I am not quite sure why it does not converge. Are you having any progress? Gilbert
Prateek Benhal
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Posted: 1 decade ago 8 mag 2013, 21:39 GMT-4
Hi Gilbert,

Thanks for the reply. I am currently not too much worried about the convergence, it can be fixed by having boundary mesh options...

Major point is how to show a spherical object rotating in DEP field?

If we look at the basics of electro-rotaion, space charge density plays a vital role too... so we need to consider a spherical object as either linear dielectric material or so.. not sure about this though.

3D model takes huge time and reach singularity, I am not sure how you got it going? Also not sure how to define rotating system in electrostatic/electric current/electromechanics physics in COMSOL?

Please let me know if you got any updates.

Regards,
-Prateek
Hi Gilbert, Thanks for the reply. I am currently not too much worried about the convergence, it can be fixed by having boundary mesh options... Major point is how to show a spherical object rotating in DEP field? If we look at the basics of electro-rotaion, space charge density plays a vital role too... so we need to consider a spherical object as either linear dielectric material or so.. not sure about this though. 3D model takes huge time and reach singularity, I am not sure how you got it going? Also not sure how to define rotating system in electrostatic/electric current/electromechanics physics in COMSOL? Please let me know if you got any updates. Regards, -Prateek

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