Abstract
This paper compares experimental results (differencesof potential), obtained with a 16-electrodeelectrical resistance tomography (ERT) device using theadjacent-electrode pair measurement strategy, with finite-element method (FEM) simulations in two and three dimensions.In the first part of the paper, ERT measurements made on ahomogeneous medium are compared with two- and three-dimensional FEM simulations.It is shown that the dependence of the electrical fieldon the axial coordinate cannot be neglected.Consequently, only the three-dimensional FEM simulations are able to fit the experimental results.In the second part of the paper, ERT measurements on staticphysical phantoms immersed in water evidence that ERT issignificantly more sensitive to non-symmetrical distributionsthan to symmetrical ones. This observation is confirmed by three-dimensionalFEM simulations performed on numerical phantoms that mimic the physical ones.In the last part of the paper, an attempt to use three-dimensional simulationsto determine the characteristics (diameter and gas content) ofa gas core created by injecting a gas flow from a single-orifice gas sparger leads to promising results.
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