HR: 11:35h
AN: H42C-06    [Abstracts]
TI: Evaluation of segmentation algorithms for x-ray-based microtomographic imaging of multi- phase flow in porous media
AU: * Wildenschild, D
EM: dorthe@engr.orst.edu
AF: Dept. of Chemical, Biological and Environmental Engineering Oregon State University, 102 Gleeson Hall, Corvallis, OR 97330,
AU: Porter, M L
EM: porterma@engr.orst.edu
AF: Dept. of Chemical, Biological and Environmental Engineering Oregon State University, 102 Gleeson Hall, Corvallis, OR 97330,
AB: Significant strides have been made in recent years in imaging fluid flow in porous media using x-ray computerized microtomography (CMT) with 1-20 micron resolution; however, one of the remaining hurdles is precise quantification of the results. Tomographic imaging was for many years focused on volume rendering and the more qualitative analyses necessary for rapid assessment of the state of a patient's health. In recent years, many highly quantitative CMT-based studies of fluid flow processes in porous media have been reported; however, many of these analyses are made difficult by the complexities in processing the resulting grey-scale data into reliable applicable information such as pore network structures, phase saturations, interfacial areas, and curvatures. Yet, relatively few rigorous tests of these analysis tools have been reported so far. The work presented here was designed to evaluate segmentation and surface generation algorithms as they were applied to CMT images of gas-fluid configurations in a number of glass capillary tubes. Interfacial areas calculated with these algorithms were compared to actual interfacial geometries and we found very good agreement between actual and measured surface and interfacial areas. (The test images used are available for download at the website listed below)
UR: http://cbee.oregonstate.edu/research/multiphase_data/index.html
DE: 0540 Image processing
DE: 1894 Instruments and techniques: modeling
DE: 1895 Instruments and techniques: monitoring
DE: 3252 Spatial analysis (0500)
SC: Hydrology [H]
MN: 2007 Fall Meeting