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DNS investigation of the dynamical behaviour of trailing vortices in unbaffled stirred vessels at transitional Reynolds numbers
File | Description | Size | Format | |
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PoF_Manuscript_final_accepted.pdf | Accepted version | 7.12 MB | Adobe PDF | View/Open |
Title: | DNS investigation of the dynamical behaviour of trailing vortices in unbaffled stirred vessels at transitional Reynolds numbers |
Authors: | Basbug, S Papadakis, G Vassilicos |
Item Type: | Journal Article |
Abstract: | Flow in an unbaffled stirred vessel agitated by a four-bladed radial impeller is investigated by using direct numerical simulations at Re = 320 and 1600. We observe fluctuations in the power consumption with a peak frequency at ca. three times the impeller rotational speed for both Reynolds numbers. It is discovered that these fluctuations are associated with a periodic event in the wake of the blades, which involves alternating growth and decay of the upper and lower cores of the trailing vortex pair as well as up-and-down swinging motion of the radial jet. Moreover, the phase relation between the wakes of the different blades is examined in detail. Further studies using fractal-shaped blades show that the exact blade shape does not have a strong influence on this phenomenon. However, the wake interaction between the blades, hence the number of blades, has a direct influence on the unsteadiness of trailing vortices. |
Issue Date: | 1-Jun-2017 |
Date of Acceptance: | 1-May-2017 |
URI: | http://hdl.handle.net/10044/1/48435 |
DOI: | https://dx.doi.org/10.1063/1.4983494 |
ISSN: | 1089-7666 |
Publisher: | AIP Publishing |
Journal / Book Title: | Physics of Fluids |
Volume: | 29 |
Copyright Statement: | © 2017 The Authors. Published by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Fluids and may be found at http://aip.scitation.org/doi/abs/10.1063/1.4983494?af=R |
Keywords: | Fluids & Plasmas 01 Mathematical Sciences 02 Physical Sciences 09 Engineering |
Publication Status: | Published |
Article Number: | 064101 |
Appears in Collections: | Aeronautics Faculty of Engineering |