The ups and downs of gas-solid flow - a review.

Abstract

The scope of this review is confined to upflow of particulate solids in a tube as occurs in vertical pneumatic conveying and riser reactors; and downflow of particulate solids in a vertical standpipe. The aims are to present a personal view on the status of knowledge of the subjects in a structured framework and to indicate areas where further work is warranted. The scope of the present review does not extend to horizontal gas solid flow or elutriation of fine particles from a fluidized bed. (from author's abstract)