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Reduced power consumption in stirred vessels by means of fractal impellers
File | Description | Size | Format | |
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1707.01730v1.pdf | Accepted version | 4.33 MB | Adobe PDF | View/Open |
AICHE_accepted.pdf | Accepted version | 4.93 MB | Adobe PDF | View/Open |
Title: | Reduced power consumption in stirred vessels by means of fractal impellers |
Authors: | Basbug, S Papadakis, G Vassilicos, C |
Item Type: | Journal Article |
Abstract: | Earlier studies have shown that the power consumption of an unbaffled stirred vessel decreases significantly when the regular blades are replaced by fractal ones. In this paper, the physical explanation for this reduction is investigated using Direct Numerical Simulations at Re = 1600. The gaps around the fractal blade perimeter create jets that penetrate inside the recirculation zone in the wake and break up the trailing vortices into smaller ones. This affects the time‐average recirculation pattern on the suction side. The volume of the separation region is 7% smaller in the wake of the fractal blades. The lower torque of the fractal impeller is equivalent to a decreased transport of angular momentum; this difference stems from the reduced turbulent transport induced by the smaller trailing vortices. The major difference in the turbulent dissipation is seen in the vicinity of trailing vortices, due to fluctuations of velocity gradients at relatively low frequencies. |
Issue Date: | Apr-2018 |
Date of Acceptance: | 24-Nov-2017 |
URI: | http://hdl.handle.net/10044/1/58652 |
DOI: | 10.1002/aic.16096 |
ISSN: | 0001-1541 |
Publisher: | Wiley |
Start Page: | 1485 |
End Page: | 1499 |
Journal / Book Title: | AIChE Journal |
Volume: | 64 |
Issue: | 4 |
Replaces: | 10044/1/55772 http://hdl.handle.net/10044/1/55772 |
Copyright Statement: | © 2018 American Institute of Chemical Engineers. This is the accepted version of the following article: Başbuğ, S. , Papadakis, G. and Vassilicos, J. C. (2018), Reduced power consumption in stirred vessels by means of fractal impellers. AIChE J., 64: 1485-1499, which has been published in final form at https://doi.org/10.1002/aic.16096 |
Sponsor/Funder: | Commission of the European Communities |
Funder's Grant Number: | FP7 - 317269 |
Keywords: | Science & Technology Technology Engineering, Chemical Engineering DNS trailing vortices radial impeller power consumption pressure coefficient unbaffled RUSHTON TURBINE FLOW TANK EFFICIENCY VORTEX physics.flu-dyn physics.flu-dyn Chemical Engineering 0904 Chemical Engineering 0914 Resources Engineering and Extractive Metallurgy |
Publication Status: | Published |
Online Publication Date: | 2018-01-18 |
Appears in Collections: | Aeronautics Faculty of Engineering |