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International Society for Industrial Process Tomography

8th World Congress on Industrial Process Tomography

Shape-Aware Parametric Reconstruction of Stratified Liquid-Gas Flow

N. Wrasse, H. L. de Moura, D. R. Pipa, M. J. da Silva Department of Electrical Engineering – CPGEI

Federal University of Technology – Parana (UTFPR) Av. Sete de Setembro, 3165, Curitiba-PR aluisio@alunos.utfpr.edu.br.

ABSTRACT

The knowledge of the phase distribution is of great interest for a safe and efficient operation of the plants in petroleum industry and in development of physical models in academic area. This work presents an improvement of an image reconstruction technique based on Electrical Capacitance Tomography (ECT) inspired sensor. Results from experimental data of a horizontal stratified liquid-gas flow show a deformation in the liquid interface caused by the surface tension between the liquid and the pipe wall. In an earlier parametric reconstruction applied in an ECT inspired sensor the interface is considered a straight line. In this work, we apply Stolt Migration to deform the XY rectangular coordinate pair of the parametrization (which forms each pixel in the ECT reconstructed image) to better match the shape of the gas-liquid interface with reality. First, the new algorithm is evaluated in a static air-water mixture where controlled amount of water (representing a specific liquid height) was injected at the pipe and then in a dynamic stratified air-water flow. The reconstructed images enable the identification of liquid height in both experiments and the deformation on water interface shows a better representation of reality. Results from dynamic experiment are compared with a known technique in literature and show a good agreement.

Keywords ECT, Image reconstruction technique, Stolt Migration, Stratified two-phase flow, Surface Tension.

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