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

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• 作者：Adam D. Wexler ; Sandra Drusová ; Elmar C. Fuchs…
• 关键词：Floating water bridge ; Electrohydrodynamic flow ; Magnetic resonance imaging ; Water isotope mixing
• 刊名：Journal of Visualization
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：20
• 期：1
• 页码：97-110
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering Fluid Dynamics; Computer Imaging, Vision, Pattern Recognition and Graphics; Classical and Continuum Physics; Engineering Thermodynamics, Heat and Mass Transfer;
• 出版者：Springer Berlin Heidelberg
• ISSN：1875-8975
• 卷排序：20

文摘

AbstractHere, 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.