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Effect of blade modifications on the torque and flow field of radial impellers in stirred tanks

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Steiros, Bruce, Buxton, Vassilicos (2017) - PRF paper.pdfAccepted version2.06 MBAdobe PDFView/Open
Title: Effect of blade modifications on the torque and flow field of radial impellers in stirred tanks
Authors: Steiros, K
Bruce, PJK
Buxton, ORH
Vassilicos, JC
Item Type: Journal Article
Abstract: We perform both high- and low-speed particle image velocimetry and torque measurements to characterize eight radial impeller types in an unbaffled stirred tank. The blade types consist of a set of regular flat blades, used as a baseline, regular blades of increased thickness, perforated blades, and fractal blades. We find a qualitative correlation between the blades' torque coefficient and both vortex coherence and turbulent kinetic energy, possibly explaining the torque differences of the tested impellers. Furthermore, we find that the proposed modifications increase the bulk turbulence levels and mass flow rates while at the same time reducing the shaft torque, showing promise for applications. Finally, we attempt a comparison between fractal and perforated geometries using data from this study and the literature.
Issue Date: 11-Sep-2017
Date of Acceptance: 1-Sep-2017
URI: http://hdl.handle.net/10044/1/53011
DOI: https://dx.doi.org/10.1103/PhysRevFluids.2.094802
ISSN: 2469-990X
Publisher: American Physical Society
Journal / Book Title: PHYSICAL REVIEW FLUIDS
Volume: 2
Issue: 9
Copyright Statement: © 2017 American Physical Society. Phys. Rev. Fluids 2, 094802
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: FP7 - 317269
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
RUSHTON TURBINE
RECTANGULAR CYLINDERS
SCALE
WAKE
PERFORMANCE
TURBULENCE
DYNAMICS
Publication Status: Published
Article Number: ARTN 094802
Appears in Collections:Faculty of Engineering
Aeronautics



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