Comparison Between Numerical & PIV Experimental Results for Gas-Solid Flow in Ducts

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Gas-solid flows are present in many industries such as Oil & Gas and Chemical Processes, and can be measured experimentally or by numerical simulations. This work presents the results of both.

The experiments were conducted in a test facility where vertical and horizontal sections of a pipe were selected as probing stations with radial profiles for axial solid velocities, obtained using Particle Image Velocimetry (PIV) technique. The test operating conditions behaved as a dilute flow and the solid particles had similar diameter compared to those applied in FCC units. The numerical simulations were run in STAR-CCM+ and a Grid Convergence Index (GCI) study was performed using Roache's approach. The refinement factor between the consecutive hexahedral meshes given by the directed mesher was accomplished with the help of HEEDS MDO. Turbulence in the gas phase was modeled with the standard k-epsilon and Reynolds Stress models whereas on the solid phase, a few different approaches were made for the model closure, such as the inviscid model and the Kinetic Theory of Granular Flows (KTGF).

Results showed that both inviscid and KTGF models produced good agreement with the experiments among the stations, particularly in regions of developed flow.

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Fabio Kasper
Oil and GasOil and Gas - Technology