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MHD Electrolyte Flow Driven by a Sinusoidal Electric Field in an Inter-electrode Gap within a Constant Magnetic Field

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Technical Report

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Combat Capabilities Development Command Armaments Center, Bent Laboratories Watervliet United States

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Pulsed electrochemical machining is a necessary extension to traditional ECM for small geometries and some high-performance materials like super alloys. Electrical current density is one of the limiting factors. The electrolyte flow in the inter-electrode gap can be assisted using a magnetic field to allow higher currents, but this creates a complex magnetohydrodynamic flow. This paper presents an experimental and computational study of electrolyte flow velocity driven by a sinusoidal electric field in an inter-electrode gap IEG within a constant magnetic field. The electrochemical impedance spectroscopy EIS experiments used a 7075 aluminum anode in an NaNO3 electrolyte that showed the effects of magnetic field intensity and input voltage frequency on the current within the electrochemical cell. Computational analysis of the electrochemical cell showed the relation between the electromagnetic inputs and flow velocity. By incorporating the experimental results into another computational analysis, the final simulation shows potential optimal operating conditions for magnetically assisted pulsed ECM.

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

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