How Can I Increase Electrostatic Force in the Grinding Wheel Industry?

[abrohit]

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How to increase electrostatic force?
I am from grinding wheel industry, on one process grains are placed on the belt conveyor. Below this conveyor aluminum sheet is connected with 11 KV power supply. Then backing disc is brought near the conveyor. then grains are lifted towards the backing disc by electrostatic force. i am actually facing the problem of grain lifting problem in heavy grains. Can anybody help in this. how to increase this electrostatic force? i can't increase the voltage.

Additional Details
Is there any way of charging these grains initially that may also help in lifting these grains

 

[m.s.j]

I am not sure about your problem, but generally the electrostatic forces is subjected to electrical field density ( E= F/Q) and you can increase E ( with changing of conductor shape) without any change in conductor voltage.

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[abrohit]

I am not sure about your problem, but generally the electrostatic forces is subjected to electrical field density ( E= F/Q) and you can increase E ( with changing of conductor shape) without any change in conductor voltage.

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Creative thinking is breezy, Then think about your surrounding things and other thought products. http://electrical-riddles.com

what changes in shape, we are using aluminum sheet of rectangular shapes.

 

[m.s.j]

As I said I don't know detail your problem, I just try to submit some explanation about related electrostatic theory.
It is often assumed that a voltage V between two electrodes may be adequately insulated by placing a homogeneous insulating material of breakdown strength Eb which is considered as a characteristic constant of the material, between these electrodes. The necessary separation d may then simply be calculated as d = V/Eb. Although the electrodes are usually well defined and are limited in size and shape ( cylindrical, spherical , rectangular and so on).
The selection of a discharge electrode form for a specific duty demands careful consideration, since each form of electrodes has its own specific emission characteristic. Although the controlled emission electrode has excellent high corona current capabilities, making them ideal for handling fine particles by helping to overcome space charge or corona suppression effects, in the absence of suppression conditions, the total corona current developed can be significantly higher than a normal lower emission type. This not only means that the transformer rectifier equipment must be much larger, but the power consumption will also be significantly higher, for the same level of efficiency.
Qualitatively, the following equation represents the breakdown potential of such a system, where the radius of the inner electrode, r, is very much smaller than R, the radius of the outer passive electrode, i.e. r << R:
E = A + C/r ^1/3
where E is the electrical breakdown field, r is the radius of the inner electrode, and A and C are experimental constants.


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