The bubble to jetting transition mechanism of plasmas in NaNO 3 solutions sustained by pulsed power
Journal
Journal of Physics D: Applied Physics
Journal Volume
45
Journal Issue
41
Date Issued
2012
Author(s)
Abstract
Plasmas in NaNO 3 solutions sustained by pulsed power with T on=10-500£gs are studied. With an applied voltage equal to or lower than 100V, the bubble mode is observed. In this mode, bubbles, a few hundred £gm in diameter, are formed and detached continuously at the electrode surface because of the buoyant force. An increase in the applied voltage to 125V results in a bubble to jetting transition. When this transition occurs, bubbles with diameters smaller than 100£gm are formed and are rapidly jetted away continuously. The examination of various conditions shows that the transition occurs when the power and energy input simultaneously exceed critical values 4.4¡Ñ10 3¡Ó6¡Ñ10 4J and 45¡Ó5W, respectively, within T on. Given the electrode surface area, this critical power is equivalent to a heat flux of 229¡Ó25MWm -2, which is close to the heat flux required, 223MWm -2, for the occurrence of explosive vaporization reported in the literature. Such an observation strongly supports the hypothesis that the bubble to jetting transition is induced by the electrothermal effect. ? 2012 IOP Publishing Ltd.
SDGs
Type
journal article