The reasons why mechanical stirring tanks are extensively applied to fermentation, gas absorption, waste water treatment and so on are because of its advantages of easily modified operating conditions, effective liquid separation and many more. Its primary function is to effectively separate liquid so as to boost the liquid flowing efficiency. The paper is mainly focused on analyzing the two-dimensional flow field of mixing blades of different sizes at dissimilar rotational speed. The result shows that the baffles of longer length will easily lead to instability of the flow field. However, we also find out that the longer the tank baffle is, the easier the eddy currents will occur, and the pressure generated by the tank baffle is greater as well. It is easier to mix liquids evenly if the length of a mixing blade is longer.
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