ABSTRACT
Although few reliable or universal models currently exist for predicting the pressure drop for gas-solid flows in pipelines, models for the single phase flow of a gas are well established. Once again, although discussion will generally be in terms of air, the models presented will work equally well with the appropriate value of the specific gas constant for the particular gas being considered. Empty conveying pipeline pressure drop values, for air only, will provide a useful datum for both the potential capability of a system for conveying material and the condition of the pipeline. Air only pressure drop values for the conveying pipeline also provide a basis for some first approximation design methods for the conveying of materials.
