CFD & AMP Center
Department of Mechanical & Aerospace Engineering
West Virginia University

Experimental & Numerical Study of Roping Phenomenon in Pipe Bends & Modelling Functioning of Axial Cyclone Separators

Simulation and Model Validation for Innovative Energy Concepts (S&V-IEC) Pressure gain combustion - Rotating detonation combustion for power generation
Dr. Ismail Celik
Dr. Steve Rowan
Frank Shaffer
Sai Satish Guda

Executive Summary

Pneumatic conveying, the process of transporting material through pipelines with gas as the carrier, is a commonly used means of material transport in industry. In order to make the plant layouts simple, the materials are transported through ducts with numerous bends and pipe sections. For instance, coal-fired power plants operate on a continuous supply of pulverised coal transported from the mill through these ducts. The piping used in these transport systems commonly includes bends that have a significant effect on the gas-solid flow structure. As a result of centrifugal forces within these pipe bends, the gas and solid particles segregate and the particles form a dense structure known as a rope. This region has relatively high particle concentration. Additionally, deposition of particles occurs due to deceleration of particles. These particle behaviors lead to difficulties for plant operators in maintaining optimal conditions for combustion in furnaces as a result of irregularities in the pulverised fuel supply. The main obljective is to numerically model this roping phenomenon in pipe bends. Simultaneously experiments are being perfomed in the laboratory supported by high speed imaging . Additional work is also being done on modelling Axial cyyclone separators which separate coarse particles from fine particles.

Visualization of roping phenomena after a pipe bend for particle-gas flows. Video

Particle trajectories colored by particle diameter, 3D CFD simulaions

Particle trajectories colored by particle ID, obtained from high speed imaging.