Journal
CHEMICAL ENGINEERING JOURNAL
Volume 306, Issue -, Pages 352-361Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2016.07.059
Keywords
Magnetic particle; Magnetic actuation; Micro reactor; Mass transfer
Categories
Funding
- European Research Council (ERC) [279867]
- Russian Science Foundation [15-13-20015]
- Russian Science Foundation [15-13-20015] Funding Source: Russian Science Foundation
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The effect of periodic changes in particle velocity on mass transfer to the reacting surface of a magnetic particle with a diameter 225 mu m in laminar flow has been investigated in a microfluidic reactor. The periodic particle motion in a fluid was investigated under a sinusoidal magnetic field generated by a quadrupole arrangement of electromagnets around the reactor. The effect of operating frequency of the rotating magnetic field, intensity of the magnetic field, and phase shift between the two sets of magnets on particle dynamics has been studied. Three particle motion modes have been observed depending on the frequency of the applied field. The mass transfer rate was estimated under steady velocity and variable velocity of the particle using a mass transfer correlation by Feng and Michaelides (2001). The validity of this correlation for the case of variable particle velocity has been confirmed with a 2D numerical model, describing actual hydrodynamics and mass transfer towards the particle surface. The mass transfer coefficient depends both on the mean particle velocity and the deviation of velocity from the mean value. The periodic movement with variable particle velocity reduces the mass transfer coefficient by 7.6% as compared to steady state motion with the same mean velocity. Crown Copyright (C) 2016 Published by Elsevier B.V. All rights reserved.
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