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Solids suspension with up‐pumping pitched‐blade and high‐efficiency impellers
Author(s) -
Myers Kevin J.,
Bakker André
Publication year - 1998
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.5450760313
Subject(s) - impeller , suspension (topology) , power (physics) , torque , turbulence , axial compressor , mechanical engineering , flow (mathematics) , blade (archaeology) , suspended solids , engineering , materials science , automotive engineering , mechanics , physics , waste management , mathematics , quantum mechanics , gas compressor , wastewater , homotopy , pure mathematics , thermodynamics
The use of axial‐flow impellers in the up‐pumping mode has been increasing, but little performance and design information is available. Up‐pumping pitched‐blade and high‐efficiency impellers have been studied in solids suspension applications, and their performance has been compared to and contrasted with that of the more conventional down‐pumping mode. Just‐suspended speed data has been interpreted in terms of two literature correlations that can be used for design purposes. Just‐suspended torque and power requirements are presented, as well as turbulent power number and flow pattern data. In general, the just‐suspended torque and power requirements of up‐pumping pitched‐blade and high‐efficiency impellers are substantially higher than those of the down‐pumping mode. However, if a large impeller diameter is required to avoid critical speed limitations or to achieve sufficient power inputs at high solids loadings, then up‐pumping impellers may be a viable option.