The accuracy of coarse-grid multiphase CFD simulations of fluidized beds may be improved via the inclusion of filtered constitutive models. In our previous study (Sarkar et al., Chem. Eng. Sci., 104, 399-412), we developed such a set of filtered drag relationships for beds with immersed arrays of cooling tubes. Verification of these filtered drag models is addressed in this work. Predictions from coarse-grid simulations with the sub-grid filtered corrections are compared against accurate, highly-resolved simulations of full-scale turbulent and bubbling fluidized beds. The filtered drag models offer a computationally efficient yet accurate alternative for obtaining macroscopic predictions, but the spatial resolution of meso-scale clustering heterogeneities is sacrificed.
Revised: September 23, 2014 |
Published: March 1, 2014
Citation
Sarkar A., X. Sun, and S. Sundaresan. 2014.Verification of sub-grid filtered drag models for gas-particle fluidized beds with immersed cylinder arrays.Chemical Engineering Science 114.PNNL-SA-101111.doi:10.1016/j.ces.2014.04.018