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Effect of solids loading on agitator just‐suspended speed
Author(s) -
Myers Kevin J.,
Janz Eric E.,
Fasano Julian B.
Publication year - 2013
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.21763
Subject(s) - exponent , agitator , total dissolved solids , range (aeronautics) , suspended solids , total suspended solids , materials science , power law , thermodynamics , mathematics , physics , composite material , statistics , engineering , philosophy , linguistics , chemical oxygen demand , environmental engineering , wastewater , viscosity , waste management
Data taken with six solids at numerous Zwietering loadings ranging from near zero to 67 have been used to determine the just‐suspended speed Zwietering loading exponent ( N js ∝ X n where n is the Zwietering solids loading exponent). When only the loadings range similar to that studied by Zwietering [Zwietering, Chem. Eng. Sci . 1958 , 8 , 244] is considered (0 < X < 18), the solids loading exponent averaged over all solids is equal to 0.12, essentially the same as the 0.13 reported by Zwietering. However, when the entire loading range is considered (0 < X ≤ 67), a higher average exponent of 0.17 is found and a single power‐law correlation does not accurately describe the experimental data. A piecewise fit of the data indicates that the solids loading exponent increases from an average value of 0.097 at low solids loadings (0 < X ≤ 5) to 0.22 at intermediate loadings (5 ≤ X ≤ 25) and 0.34 for the highest loadings (25 ≤ X ≤ 67).