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Electrical resistance tomography (ERT) allows to measure hydrocyclone internal flow dynamics in situ. A dual‐plane high‐speed ERT system is proposed to map two‐phase distributions with varying operational parameters. Experimental results are presented in terms of air‐core diameter and its size variation for various feed flow rates and design variables. The total variation algorithm provides the best results compared to Tikhonov and Gauss‐Newton algorithms. The influence of finite element method mesh size on air‐core resolution is evaluated. High‐speed video imaging and a volume‐of‐fluid‐based two‐phase computational fluid dynamics (CFD) model are adopted to determine the air‐core size. Cross validation of air‐core size and shape is performed by ERT measurements with CFD simulations and high‐speed video imaging.

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