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Network Analysis of Grain Bulk Pore Structure Using High Resolution X-ray Computed Tomography Images

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:   No Citation available.
Authors:   S Neethirajan, D S Jayas
Keywords:   pore network, airflow resistance, grain bulks, 3D image analysis, X-ray CT, connectivity

The knowledge of distribution of pore space inside grain bulks is essential for determining the effect of porosity on the airflow resistance of grains. In this study, the geometry of pore structure and the 3D-distribution of void spaces inside the grain bulks were studied using high resolution X-ray computed tomography (CT) images. The quantitative analysis of the architecture, geometry and spatial continuity of the pore network inside grain bulks was done using image processing algorithms. Image analysis methods were applied to the binary 3D X-ray CT images on the spatial distribution of voids to generate the connected, individualized pore objects of different size and shapes. Morphometric parameters such as 3D air path volume distribution, air path thickness, Euler number, fragmentation index, structure model index were calculated three dimensionally based on hexahedral marching cubes volume model and marching cubes 3D surface construction algorithm. The results showed that the connectivity of airspace and the non uniform distribution of void space inside grain bulks were responsible for the difference in resistance to airflow of grain bulks between horizontal and vertical directions.

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