A previous study from the collaboration between our group and Prof. Müller’s group at ETH Zurich investigated the bubble behavior and particle velocity in 3D freely bubbling fluidized beds with real-time MRI (Industrial & Engineering Chemistry Research 57, 9674). Using these rich data sets as benchmarks, we critically evaluated the accuracy of sub-models in two fluid modeling of fluidized beds, including the drag law and particle stress closure relationships. This new modeling study was recently published in Industrial & Engineering Chemistry Research. The cover art will be featured on the front cover of a future issue of Industrial & Engineering Chemistry Research. Kenan Xi, Qiang Guo, and Chris Boyce are the authors of the paper.