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Study of cavitation in liquid water under the action of inhomogeneous pulsed electric fields: application to sub-nanosecond electrical breakdown



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Fakulta / Pracoviště MU

Přírodovědecká fakulta

Popis Sub-nanosecond electrical breakdown in dielectric liquids is of vital interest. Liquid dielectrics in strong nonuniform electric fields are under influence of electrostrictive force that tents to move the fluid into the regions with higher electric field. If the voltage rise is fast enough, the liquid does not have enough time to set into motion thanks to inertia. Then the poderomotive force induces significant stress in the bulk of the liquid leading to generation of a negative pressure. At certain threshold, the negative pressure causes cavitation ruptures of the fluid. Free electrons then can be produced by emission from the surface inside the cavity and accelerated to energies exceeding the energy for ionization of water and contribute thus to formation of microstreamers.
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