In this work, four different flowability powder tests – angle of repose measuring, flow from hopper simulation, classical tube method and evaluation of flow functions using FT4 powder rheometer - were compared. The TiO2 powders with different content of nanoparticle were used for these comparisons. These powders were characterized by basic mechanical-physical parameters such as particle size distribution, density, moisture etc. The first flowability method (angle of repose measuring) uses stand with vibration feeder of fine powder material. Flow simulation method is based on powder flow from the hopper. Both mentioned test stands were created in Bulk Solids Centre Czech Republic. Third classical tube method is based on free pouring of powder on the pad. These three methods named above are evaluated on a static angle of repose. The fourth test is based on the calculation of the flow function as ratio major principal stress and unconfined yield strength measured using FT4 powder rheometer. Flowability methods of TiO2 powder have been compared. The advantages and disadvantages of the individual methods and the areas of their use have been identified.Keywords: Flow, powders, angle of repose, titanium white, FT4 powder rheometer
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