Experimental Research of the Resistance Characteristics of High-concentration Fine Powder Stratified Flow in a Horizontal Pipe

With a progressively better understanding of the advantages of a high-concentration fine powder conveying system the latter has recently become an object under extensive study by numerous scholars. A stratified flow in a horizontal pipe represents the most important form of high-concentration powder transport flow. In view of this the study of its resistance characteristics is of great significance. On the basis of a review of their work in this area over the past fifty years the authors have analyzed the merits and demerits of empiric formulas presented by various scholars. Through a series of tests on a test rig of high-concentration pneumatic conveying system, deduced is a formula for calculating the resistance characteristics of a high-concentration fine powder stratified flow in a horizontal pipe. An error analysis indicates that the above-mentioned formula can well meet the relevant requirements of general engineering design.