Pressure Drop in the Pneumatic Conveyance of Granular Materials through a Horizontal Pipe in the Case of High Solids Loadings and Low Air Velocities

For a fully developed flow through a horizontal polyacrylic pipe with inner diameter of 50 mm, a formula giving friction factors for an additional pressure drop attributed to the solids was derived in the case of high solids loadings and low air velocities, and it was confirmed that the formula agrees fairly well not only with authors' experiments but also with the results calculated from the experimental data obtained by Welschof.