Factors contributing to streamer morphology

Hebner, Robert E.

doi:10.1109/icdl.2002.1022718

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Moreover, the predicted behavior is that as the electric field is reduced and/or the electron density is increased, the streamers become bushier. This is consistent with experimental observations in streamers from point cathodes [17]. This correlation suggests that the model may be equally valid for anode and cathode streamers.…”

Section: Discussionsupporting

confidence: 81%

Modeling the Growth of Streamers During Liquid Breakdown

Kim

Hebner

Hallock

2008

IEEE Trans. Dielect. Electr. Insul.

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Earlier work by Fowler, Davaney, and Hagedorn showed that the morphology of an anode streamer could be modeled as stochastic growth of a branching fractal tree in point-plane geometry. This investigation reproduces the results of that earlier study. Because one of the concerns about the earlier work is that the electric field dependence appeared to be unphysical, the model was modified to operate under assumptions that are consistent with those that have proven useful in earlier investigations. Specifically, linear electric field dependence was assumed and there is an assumed variability in the number density of available electrons. Computations using this assumption also produce the same range of morphologies that has been measured in experiments. In addition, some assessments of sensitivity to other possible variables are made. First, the sharp cutoff in the electric field strength is replaced with a presumably more realistic exponential dependence on energy. Under this assumption, it is also possible to simulate the experimentally observed behavior of anode streamers. It is shown that three possible refinements to the model have small, and likely negligible, effects. The first is using variable streamer step lengths in the calculation rather than the fixed step length used in the earlier work. The second is to assume growth at one point in the streamer makes growth in other parts somewhat less likely. The third is the assumption that the probability of a streamer making the next step in growth is influenced by the distance of the inter-electrode gap that has already been traversed.

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Section: Discussionsupporting

confidence: 81%

Modeling the Growth of Streamers During Liquid Breakdown

Kim

Hebner

Hallock

2008

IEEE Trans. Dielect. Electr. Insul.

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“…The third set of experiments involved the addition of a chemical additive to the test liquid [10]. In these studies, the streamer initiated from a point anode.…”

Section: Experimental Backgroundmentioning

confidence: 99%

Stochastic Modeling of Streamer Transitions

Kim¹,

Murphy

Hebner

2008

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Abstract-Simulations of the growth of streamers using a model based on the stochastic growth of a branching fractal tree have shown good fidelity in matching the morphology of streamers in liquids. An important aspect that has not yet been simulated is the transition between Type 1 and Type 2 streamers. This work explores the effect of a variation of the applied voltage during streamer growth as well as the effect of differing amounts of available electrons during growth. Neither of these assumptions produced the experimentally observed transitions. These results produced a possible approach that could modify the step length in the simulation in relation to the electric field that may trigger the transition. It also points out that the transition might be due to hydrodynamic instabilities that are not captured by the model.

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Factors contributing to streamer morphology

Cited by 2 publications

References 15 publications

Modeling the Growth of Streamers During Liquid Breakdown

Modeling the Growth of Streamers During Liquid Breakdown

Stochastic Modeling of Streamer Transitions

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