It is shown here that the late hydrodynamic effects of fast spark discharges (dI/dt‖t=0≥1010 A/sec), i.e., after the discharge period, can be described by a point explosion simulation. The solution is not self-similar since counterpressure has to be taken into consideration. This non-self-similar model is confirmed experimentally by shock wave position and velocity measurements.
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Loeb et al. (1985) studied this question.
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