ECT Images Reconstruction of Freely Falling Particles Concentration Distribution in Vertical Pipe Using GVSPM

• Published in: Nihon Kikai Gakkai rombunshuu. B hen Vol. 72; no. 723; pp. 2652 - 2659
• Main Authors: TAKEI, Masahiro, SAITO, Yoshifuru, OCHI, Mitsuaki
• Format: Journal Article
• Language: Japanese; English
• Published: The Japan Society of Mechanical Engineers 2006
• Subjects: Electrical Computed Tomography; Generalized Sampled Pattern Matching Method; Ill Posed Inverse Problem; Image Reconstruction; Multiphase Flow
• ISSN: 0387-5016; 1884-8346
• DOI: 10.1299/kikaib.72.2652

A new reconstruction method called Generalized Vector Sampled Pattern Matching (GVSPM) was applied to the image reconstruction of an electrical capacitance computed tomography (ECT) in freely falling particles in a vertical pipe. This new method is able to achieve stable convergence without the use of an empirical value. Experiments were carried out using three particle types with various electric charges and four particle flow rates to measure the capacitance of a pipe cross section. The three particle types were polyethylene pellets (PP), silica sand (SS) and polyvinyl chloride (PVC). Four flow rate settings were used resulting in a volume flow rate ranging from3.08×10-5 to 1.04×10-3 [m3/s]. The GVSPM method is compared with conventional methods in terms of volume fraction, residual capacitance, and capacitance correlation. Overall, the GVSPM method proved superior to conventional methods in the case of polyethylene pellets with high electric charge. GVSPM achieves accurate reconstruction by using an objective function that is calculated as the inner product calculation between the experimental capacitance and the reconstructed image capacitance.