Using a multi-parameter particle shape description to predict the motion of non-spherical particle shapes in swirling flow

摘要

A new three-parameter particle shape description is introudced, to replace the standard single parameter (particle diameter) shape description used in the majority of CFD codes. The description is based on the superellipsoid, allowing for three variable parameters: the minor axis, the aspect ratio and the supereliptic exponent. The shape description has been incorporated into an extended modeling framework, which still allows for spheres whilst at the same time also allowing for more complex shapes, such as ellipsoids or cylinders, giving the model large flexibility. As the speed and accuracy of the new model are very similar to existing models of spheres, it represents significant benefits compared to standard models, particularly in engineering applications. The model has been tested on tubular combustor test rig, and a number of significant parameters compared for various shapes and sizes under the same isothermal flow conditions. These indicate the importance of not taking into account non-spherically when considering gas-particle systems.