Mixing of Plastic Fluid with Large Paddle Impeller

To study the mixing mechanism of various large paddle impellers developed by Japanese mixer companies, the authors evaluated the streak line patterns of the impellers in Newtonian fluid; however, streak line data in non-Newtonian fluids is not available. A larger distance between the liquid free surface and the upper edge of impeller was better for improving the mixing performance of Newtonian fluid with the large paddle impellers. However, it was found that a shorter distance between the liquid free surface and the upper edge of impeller is better in order to produce stress exceeding the yield stress in the mixing of non-Newtonian fluids and expand the cavern area to the entire liquid volume.