Agitation is used to maintain homogeneity in the system while mixing is used to mix two of more phases in one phase. if we have calcium carbonate and water, initially we have 2 phases, as we start mixing it after some time it will form slurry and this slurry has to be agitated to make its concentration uniform. One more example of agitation is related to curd, when we agitate curd, ghee will come over and the rest yogurt (lassi) will remain below.
For agitation we can use Impellers which are categories in 3: Propeller, Turbine and High efficiency impellers.
Propellers produce axial flow like marine propeller, turbine produce generally radial but also axial like mixture grinder in home and improved of turbine is high efficiency impeller which reduces the power consumption.
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