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Abstract

In electrically stimulated fabric filtration, the presence of an applied electric field reduces the pressure drop across the filter. One possible explanation involves an observed (electric field induced) shift in dust cake mass distribution towards upstream regions of the fabric where the porosity is greater. This paper hypothesizes that the greater pore sizes in these regions can accommodate more mass without plugging, thereby reducing the overall resistance of the filter. A mathematical model based on the Happel cell model is developed to calculate the pressure drop across a fibrous filter of nonuniform packing density and cake mass distribution. Both the model and experimental results are consistent with the hypothesis.

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