Abstract
The void fraction in a powder packed bed is not uniform and the vertical distribution of void fraction varies with the packing method. However, detailed profile of void fraction distribution and effect of packing method on the distribution have not been discussed. Recently, X-ray micro Computed Tomography was developed and applied to the observation of powder packing structure. We utilized X-ray micro CT Scan to measure the void fraction profiles of powder layer formed by piston compression and centrifugal packing. Our experimental results showed that void fraction increases with the depth of powder layer in piston compression while it decreases with the depth of powder layer in centrifugal packing. The theoretical void fraction profiles, calculated by Janssen's equation with boundary condition of each packing method, well expressed the measured voidage distribution by X-ray micro CT scanning.
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