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The Effect of Agitator Impeller Design on Maximum Shear Stress, and the Resulting Impact on the Flocculation Process
Author(s) -
Griffiths S.
Publication year - 1996
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/j.1747-6593.1996.tb00060.x
Subject(s) - agitator , impeller , flocculation , shear stress , shear (geology) , process (computing) , process engineering , engineering , mechanical engineering , environmental science , materials science , computer science , environmental engineering , composite material , operating system
Although 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.