Abstract
An experimental study of the conveying of coal as a plug at low air velocity in a horizontal pipe and 45° inclined pipe were completed. The pressure drop and the plug velocity were measured at various air velocities and plug lengths Within the range of study, the pressure drop varied linearly with the plug length and it was essentially independent of the air velocity. Also, the plus velocity was independent of the plug length under the conditions studied. A model to predict the pressure drop was proposed and was found to be in good agreement with the experimental results. Both in the horizontal and inclined flows, the model suggested that the wall shear was controlling the flow. The failure was passive, that is, the radial compression stress was greater than the axial compression stress.
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