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Close‐clearance helical impellers: A physical model for newtonian liquids at low Reynolds numbers
Author(s) -
Chavan V. V.
Publication year - 1983
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690290202
Subject(s) - impeller , reynolds number , mechanics , mixing (physics) , heat transfer , newtonian fluid , flow (mathematics) , non newtonian fluid , mathematics , thermodynamics , physics , statistical physics , turbulence , quantum mechanics
With simple hydrodynamic concepts, a physical model is developed to describe the flow at the wall close to the impeller blade. The parameters of this model were evaluated from the large amount of data on power consumption and checked with some independent data on velocity profiles. Together with the physical insight provided by the model, it helped to obtain general relationships for power and heat transfer coefficients. Equations for the latter were developed using Lévêque's approximation. Agreement between the predicted results and the literature data of several independent studies was rather good. A method to analyze mixing or blending results is also suggested.