The double-pitched blade impeller is a multi-stage counterflow impeller. Developed as an improved version of the conventional paddle impeller, it promotes a large axial circulation of the liquid during operation and can reduce mixing time by 30% compared with conventional pitched-blade impellers. It is generally used in multi-impeller combinations. It is especially suitable for mixing, solid suspension, liquid-liquid dispersion, dissolution, heat transfer, and other operations in the transitional flow regime.
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