Abstract: A system for generating a plasma discharge in liquid utilizes first and second electrodes spaced apart in an interior space of a vessel holding the liquid. A channel can be defined in certain embodiments at least partially by at least one of the first and second electrodes, and an inlet in fluid communication with the interior space is configured to generate a vortical fluid flow in the vessel. A method for generating a plasma discharge in liquid is also provided.

Abstract: A system and method for stretching the discharge of plasma in a liquid utilizes in certain embodiments a first, second and third electrode within a liquid holding container, a gas injection conduit for introducing a gas such as air or oxygen into the container, and a power supply electrically coupled to at least the second and third electrodes. In certain embodiments, a seed plasma generated by a first and second electrode is stretched, and a larger plasma is generated by a first and third electrode. In certain embodiments, a fourth electrode can be used to further stretch the plasma. An increase in gas introduction flow rate can also be utilized to facilitate the stretching of plasma.