Agitation Reactor: Impeller Types, Mixing Regimes and Heat Transfer Design Answering the core question: What is an agitation reactor? An agitation reactor is a vessel in which a mechanically driven impeller, mounted on a central shaft, mixes the contents to achieve blending, heat transfer, gas dispersion or solids suspension during a reaction, rather than relying on the flow from pumps or the reaction itself. The agitator, not the shell, is the heart of the machine, and its