Reduced mixing time in stirred vessels by means of irregular impellers

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Title: Reduced mixing time in stirred vessels by means of irregular impellers
Author(s): Papadakis, G
Vassilicos, C
Basbug, S
Item Type: Journal Article
Abstract: Previous research has shown that using fractal-like blades instead of regular ones can result in a significant decrease in the power consumption of an unbaffled stirred vessel with a four-bladed radial impeller. In order to fully assess the mixing efficiency of a fractal-like or just irregular impeller with respect to a regular impeller, the mixing time required to homogenize an injected passive scalar was evaluated for both impeller types at Re = 320 and 1600 using direct numerical simulations. It was observed that the irregular impeller can lead to a considerably shorter mixing time. This result was explained by the differences in characteristics of flow and scalar fields generated by the two impellers. We also assess the effect of Re in the transitional regime. Moreover, a simple mathematical model is proposed which can approximate the decay rate of the passive scalar fluctuations integrated over the tank volume.
Publication Date: 21-Aug-2018
Date of Acceptance: 18-Jul-2018
URI: http://hdl.handle.net/10044/1/62858
DOI: https://dx.doi.org/10.1103/PhysRevFluids.3.084502
ISSN: 2469-990X
Publisher: American Physical Society
Journal / Book Title: Physical Review Fluids
Volume: 3
Issue: 8
Sponsor/Funder: Commission of the European Communities
Funder's Grant Number: FP7 - 317269
Copyright Statement: © 2018 American Physical Society
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
FRACTAL-GENERATED TURBULENCE
LARGE-EDDY SIMULATION
RUSHTON TURBINE
POWER-CONSUMPTION
FLUID-FLOW
TANK
SCALAR
LIQUIDS
CFD
ENHANCEMENT
Publication Status: Published
Article Number: ARTN 084502
Online Publication Date: 2018-08-21
Appears in Collections:Faculty of Engineering
Aeronautics



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