Magnetic resonance imaging of flow and mass transfer in electrohydrodynamic liquid bridges

Here we report on the feasibility and use of magnetic resonance imaging based methods to the study of electrohydrodynamic (EHD) liquid bridges. High speed tomographic recordings through the longitudinal axis of water bridges were used to characterize the mass transfer dynamics, mixing, and flow stru...

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Bibliographic Details
Published in:arXiv.org 2016-03
Main Authors: Wexler, Adam D, Drusova, Sandra, Fuchs, Elmar C, Woisetschläger, Jakob, Reiter, Gert, Fuchsjäger, Michael, Reiter, Ursula
Format: Article
Language:English
Subjects:
Anolytes
Electrohydrodynamics
Feasibility studies
Heavy water
Light water
Liquid bridges
Magnetic resonance imaging
Mass transfer
NMR
Nuclear magnetic resonance
Nuclei (nuclear physics)
Phase contrast
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Summary:Here we report on the feasibility and use of magnetic resonance imaging based methods to the study of electrohydrodynamic (EHD) liquid bridges. High speed tomographic recordings through the longitudinal axis of water bridges were used to characterize the mass transfer dynamics, mixing, and flow structure. By filling one beaker with heavy water and the other with light water it was possible to track the spread of the proton signal throughout the total liquid volume. The mixing kinetics are different depending on where the light nuclei are located and proceeds faster when the anolyte is light water. Distinct flow and mixing regions are identified in the fluid volumes and it is shown that the EHD flow at the electrodes can be counteracted by the density difference between water isotopes. MR phase contrast imaging reveals that within the bridge section two separate counter propagating flows pass one above the other in the bridge.
ISSN:2331-8422