The typical discharge voltage and current waveforms measured
for the point-to-cylinder and the coaxial rod-to-cylinder
electrode configuration at a solution conductivity of 150 μS/cm
are shown in Fig. 3. The maximum values of the measured
voltage were ∼37 and ∼30 kV for the point-to-cylinder and
the coaxial rod-to-cylinder electrode system, respectively. The
maximum of the measured current for the coaxial rod-tocylinder
electrode system was significantly larger than that of
the point-to-cylinder one at the same solution conductivity. The
maximum of the measured current increased with increasing
the solution conductivity in both electrode configurations. The
dissipated energy per pulse was evaluated from the product of
the discharge voltage and current, and the results are plotted in
Fig. 4. The dissipated energy per pulse increased with increasing
the solution conductivity in both electrode configurations.
At the same solution conductivity, the dissipated energy per
pulse in the coaxial rod-to-cylinder electrode configuration is
about three times larger than that in the point-to-cylinder one.
This result indicates that the rod-to-cylinder electrode has an
advantage over the point-to-cylinder one in injecting energy
into the water bulk