Theoretical Considerations Concerning Quantized Magnetic Flux in Superconducting Cylinders

1961 ◽  
Vol 7 (2) ◽  
pp. 46-49 ◽  
Author(s):  
N. Byers ◽  
C. N. Yang
Keyword(s):  
Magnetic Flux ◽  
Theoretical Considerations ◽  
Quantized Magnetic Flux

Electromagnetically Actuated Membrane-Based Micropumps with Integrated Magnetic Yoke

2009 ◽  
Vol 6 (4) ◽  
pp. 205-210
Author(s):  
Thomas Lederer ◽  
Martin Heinisch ◽  
Wolfgang Hilber ◽  
Bernhard Jakoby
Keyword(s):  
Magnetic Flux ◽  
Energy Input ◽  
Electric Energy ◽  
Clinical Diagnostics ◽  
Design Parameters ◽  
Comsol Multiphysics ◽  
Electromagnetic Actuators ◽  
Electromagnetically Actuated ◽  
Theoretical Considerations ◽  
Membrane Deflection

Micropumps are an essential part of laboratory-on-a-chip applications, which are used for cell manipulations, DNA sequencing, and clinical diagnostics, just to name a few. Electromagnetic actuators are used for fluid transportation, because of relatively high forces and high displacements. Most published electromagnetic actuators for micro pumps are designed without a magnetic flux guiding yoke. In our paper, we present electromagnetic micro pumps with two alternative actuation principles, that is, Lorentz forces and reluctance forces, both with an integrated magnetic yoke. The high magnetic permeability and the higher magnetic flux enhance the mechanical force at the same electric energy input or primarily enable the functionality of the reluctance pump. The electromagnetic forces are used to drive a fluid flow via membrane deflection and passive valves without moving parts. The geometry of these passive valves is optimized to via finite element simulations (Comsol Multiphysics). Design parameters and theoretical considerations are discussed in this paper, and fabricated prototypes are presented.

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