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@article{Basbug:2018:10.1002/aic.16096,
author = {Basbug, S and Papadakis, G and Vassilicos, C},
doi = {10.1002/aic.16096},
journal = {AIChE Journal},
pages = {1485--1499},
title = {Reduced power consumption in stirred vessels by means of fractal impellers},
url = {http://dx.doi.org/10.1002/aic.16096},
volume = {64},
year = {2018}
}

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TY  - JOUR
AB  - 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 timeaverage 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.
AU  - Basbug,S
AU  - Papadakis,G
AU  - Vassilicos,C
DO  - 10.1002/aic.16096
EP  - 1499
PY  - 2018///
SN  - 0001-1541
SP  - 1485
TI  - Reduced power consumption in stirred vessels by means of fractal impellers
T2  - AIChE Journal
UR  - http://dx.doi.org/10.1002/aic.16096
UR  - https://aiche.onlinelibrary.wiley.com/doi/full/10.1002/aic.16096
UR  - http://hdl.handle.net/10044/1/58652
VL  - 64
ER  -

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