This work concerns the evaluation of a numerical model of a scaled circulating fluidized bed (CFB) with a square cross section. The evaluation consists of a comparison of the numerical results with measurements achieved using laser Doppler anemometry (LDA) and pressure taps. The CFB is fluidized using metal particles, which enable the laboratory-scale CFB to be operated under scaled conditions of a full-scale CFB. The numerical part is based on a three-dimensional multiphase computational fluid dynamics (CFD) model that uses an Eulerian description for the gas and solid phases. The conservation equations for the solid phases are based on the kinetic theory for granular flow, which provides adequate modeling of the solid phase when the Eulerian approach is used. Three-dimensional simulations. are found to be superior to two-dimensional simulations in comparisons to the experimental findings.