Abstract
AbstractAlthough it is extensively researched, flocculation in the water‐treatment industry lacks a design procedure to assess accurately the performance of the different types of agitator impeller which are available. New high‐efficiency, hydrofoil‐type impellers offer substantial potential for flocculation duties in many areas, provided that they are applied correctly. This paper highlights the importance of the ‘velocity gradient’and the distribution of shear within the agitation system. The objective of the paper is to help engineers to evaluate different types of proprietary impeller designs, using various techniques to examine the shear distribution applied to the system.
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