Convection and Turbulence Effects in Strongly Driven Electrochemical Deposition

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Abstract
We study fast electrodeposition of zinc in a narrow channel using high magnification video microscopy to visualize the activities near the growth tips. We find that streamline and turbulent convection occur for different growth morphologies. In the regime of dendritic growth, we observed space charge fluctuations and the eruption of plumes. We probe the dynamics of such convective dendritic growth by applying an ac voltage on top of the dc deposition voltage. The ac current response shows a broad-band nonlinear behavior, in sharp contrast to the narrow-band linear behavior of diffusion-limited dendritic growth.