Particle Image Velocimetry combined with image processing method is used to measure the liquid-solid two phase flows with crystallization phenomenon in three different impellers. The experimental results indicate that: there is not any crystal particle during the delay period, and the performance of pump is not affected. After the delay period, the crystal nuclei are born from the supersaturating solution and growing larger with temperature decreasing. And it was found solid particles tend to move towards blade pressure surface. It is also observed that collision between solid particles with tail part of blade pressure surface is more intensive in impeller with large blade outlet angle.

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