Fully Stratified Particle-Laden Flow in Horizontal Circular Pipe

Abstract

This article describes the results of an experimental measurement and visualization of coarse-grained fully stratified particle-water mixtures. This article focuses on the study of the carrier liquid velocity field and behavior and local velocities of conveyed particles. Glass balls and graded pebble gravel of 6 mm mean diameter were conveyed by water in a horizontal smooth pipe loop with a transparent pipe viewing section of inner diameter 40 mm. The measurements were performed in the smooth pipe and the pipe with rough stationary bed created by two layers of spherical particles of the same mean diameter as the conveyed particles. Particle movement along the pipe bottom was studied and the effect of the stationary bed on local velocity values of the carrier liquid and conveyed particles were evaluated. It was concluded that in the flow with stationary bed the maximum liquid velocity is markedly shifted from the pipe center to its top. The coarse-grained particles moved principally in a layer close to the pipe invert, for higher flow velocities particle saltation becomes the dominant mode of transport.

Keywords:

• Coarse-grained slurry
• flow structure
• liquid local velocity
• particle velocity
• PIV

Acknowledgments

Article presented at CHoPS 2012—7th International Conference for Conveying and Handling of Particulate Solids, Friedrichshafen, Germany, September 10–13, 2012.

Notes

Color versions of one or more of the figures in the article can be found online at www.tandfonline.com/upst.