Flow of spheres and near spheres in cylindrical vessels, Part IV - individual flow paths in recirculated random packings.
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Date
1973-12
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Publisher
Australian Atomic Energy Commission
Abstract
An experimental investigation was made of the transit of individual pebbles in recirculated random packings of equal spherical or aspherical pebbles. Pebbles of 1.0 inch or 0.75 inch nominal diameter and 3.0 or 3.4 specific gravity are used to form beds in a 30 inch diameter vessel with a concave base and single axial outlet. The pebbles flow downwards under the influence of gravity through a rotating extractor in the base. A radio-actively tagged pebble is inserted at the top of the bed and as it descends with the pebble packing its position is detected and recorded at intervals using a tracking device. In this way tracks and velocities of pebbles seeded in the bed for various combinations of seeding radius, bed and pebble parameters are determined, and are found to be generally of 'streamline' form. The extractor rotation has very little effect on the motion of the pebbles in the bed. Using the tracks of tagged pebbles, patterns and effects of flow zones are deduced. Transit numbers of tagged pebbles are found to be in good agreement with the results of similar experiments recorded in Part III of this report series.
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Keywords
Cylinders, Fuel assemblies, Fuel elements, Pebble bed reactors, Reactor fueling, Spheres
Citation
Gatt, F. C. (1973). Flow of spheres and near spheres in cylindrical vessels. part iv. individual flow paths in recirculated random packings (AAEC/E273). Lucas Heights, NSW: Research Establishment, Australian Atomic Energy Commission.