Principle of EHD pump

non-uniform electric field applied to the fluid, charge induced in fluid due to the polarization

for “traveling” electric fields
- charges interact with the electric fields -->
- fluid is “dragged along” by the electrode fields

+ + + - - _- + + +

- + + + - - - + +

- - + + + - - - +

0< t

t0< t <2t0

2t0

Electrode 1

Electrode 2

Electrode 3

Electrode 4

Electrode 5

Electrode 6

Direction of the traveling wave voltage

t0 2t0 3t0 4t0 5t0 6t0

- - -- - - - + + + -- - - - -

-- -- + + - - --

dielectric material is polarized in the external electric field