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The characteristics of the electric double layer formed at a negatively charged metal electrode in contact with pure water are explored in this article. Based on the electric field distribution of the Modified Poisson Boltzmann (MPB) model, which contains the activity corrections only, the study evaluates the effects of finite ion size, polarization, image potential and field dissociation on the distribution of the hydronium ion concentration.

Ionic wind devices or electrostatic fluid accelerators are becoming of increasing interest as tools for thermal management, in particular for semiconductor devices. In this work, we present a numerical model for predicting the performance of such devices; its main benefit is the ability to accurately predict the amount of charge injected from the corona electrode. Our multiphysics numerical model consists of a highly nonlinear, strongly coupled set of partial differential equations including the Navier-Stokes equations for fluid flow, Poisson's equation for electrostatic potential, charge continuity, and heat transfer equations. To solve this system we employ a staggered solution algorithm that generalizes Gummel's algorithm for charge transport in semiconductors. Predictions of our simulations are verified and validated by comparison with experimental measurements of integral physical quantities, which are shown to closely match. [ABSTRACT FROM AUTHOR]

A model for the axially blown cylindrical arc is derived to determine the dependence of the maximum interruptible current rate, (dI/dt)(sub L), on the pressure, on the parallel capacitance, and on the line impedance for an SF(sub 6) arc. It is found that the arc resistance, at current zero with current rate equal to (dI/dt)(sub L), is pressure independent.