Experiments on the flow of air-solids mixtures through long straight lengths of brass and nylon pipe, under choking conditions, are described. The powders conveyed are polystyrene, silica, and steel shot. Experimentally determined pressure distribution curves are used to compute the variation of gas and solids, velocities, and temperatures along the pipes, taking into account the size distribution of each powder. The predicted values of gas and solids velocities are compared with experimental values obtained by pitot tube traversing, and a highspeed photographic technique, respectively.
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