Experimental analysis of velocity reduction in bends related to vertical pipes in dilute phase pneumatic conveying

Abstract

Abstract The behavior of particles in dilute phase pneumatic conveying is a rather complex phenomenon. For example, particle velocities and their trajectories owing to particle-particle and particle-wall collisions are unpredictable. In this study, we focus on particle velocity reduction in horizontal-vertical (H-V) and vertical-horizontal (V-H) bends. A new terminology, ‘bend point’, is introduced to compare different bends on common measures. A broad range of materials (Archimedes numbers\u202f=\u202f102 to 106) was investigated using six different bends (blind-T, R/D\u202f=\u202f1.5, 4.5, 6.6, 10, and 20) and wide range of conveying velocities (10\u202fm/s