A. Weddemann, A. Hütten, S. Herth, and M. Schilling
Universität Bielefeld, Fakultät für Physik, Bielefeld
In this work, a system for magnetic and hydrodynamic manipulation of magnetic beads is modelled. A geometry is introduced to assure a good separation behaviour with respect to the magnetic moment of the particles. Different separation mechanisms will be discussed and an estimation of the minimal difference of separable magnetic moments will be given. Further it will be shown, that the ...
A. M. Morega1, J. C. Ordonez2, and M. Morega1
1Politehnica University of Bucharest, Bucharest, Romania
2Florida State University, Tallahassee, FL, USA
In this paper, we present a FEM model of a mixing MEMS μTAS device. A quasistatic magnetic field, produced by sequentially switched DC currents advected through conductors embedded in the device substrate beneath the flow channel, is used to mix the working magnetic fluid, while it is forced to flow through a rib walled channel. The body forces in the magnetized fluid perturb the otherwise ...
N. Al Cheikh, P. Xavier, J. Duchamp, and K. Schuster
Institute of Microelectronics, Electromagnetism and Photonics (IMEP-LAHC), Grenoble, France
Institute of Millimetrics Radio Astronomy (IRAM), Grenoble, France
Superconducting GHz electronics circuits are frequently used in Radio Astronomy instrumentation. The features of these instrumentations can be significantly improved by using tuneable capacitances, which can be realized by electrically actuated, micromechanical bridges (MEMS) made of superconducting Niobium (Nb). In order to analyze the electromechanical behavior of such devices and the intrinsic ...
D. Krizaj, I. Iskra, Z. Topcagic, and M. Remskar
University of Ljubljana, Faculty of Electrical Engineering, Ljubljana, Slovenia
Institut Jozef Stefan, Ljubljana, Slovenia
We are developing nanoparticle detector for airborn particles. The detection principle is based on condensation of nanoparticles forming micron sized water droplets and detection of the droplets by a capacitive type nanodetector. We have successfully performed some experimental evaluations of the detection principle and are in the stage of optimization of several parts of the system. As shown ...
F. Wittbracht, A. Weddemann, A. Auge, and A. Hütten
Department of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany
In this work, we show that dipolar magnetic coupling can be used to control the particle flow through microfluidic structures without changing the state of motion of the carrier liquid. Also no external magnetic gradient fields are employed; the total external magnetic force applied is therefore zero. The theoretical idea will be tested experimentally. Here, additional effects originating from ...
B.P. Cahill, M. Quade, G. Gastrock, K. Lemke, J. Metze, and D. Beckmann
Institut für Bioprozess und Analysenmesstechnik e.V., Rosenhof, Heilbad Heiligenstadt, Germany
This paper presents a simulation of the operation of a new type of droplet generation probe. This probe, consisting of two concentrically-arranged tubings, is immersed in a beaker of cell medium so that oil is pumped through the outer tubing at a pumping speed less than fluid is drawn into the inner tubing. In this way, droplets of cell medium are entrained into the outlet tubing forming a ...
S. Nelson, and M. Guvench
University of Southern Maine, Gorham, Maine, USA
COMSOL Multiphysics is employed to model, simulate and predict the performance of a high Q, in-plane rotational resonating MEMS sensor. The resonating sensor disk is driven by thermal expansion and contraction of the support tethers due to AC joule heating. The resonant frequency is sensed by stationary contacts. For cost reduction, the relatively simple, low cost SOIMUMPS fabrication process is ...
Pryor Knowledge Systems, Inc., Bloomfield Hills, MI, USA
COMSOL Multiphysics software, when properly configured, can readily solve modeling problems in the laminar flow regime using the standard Navier-Stokes equations or in the fully turbulent flow regime using the kappa-epsilon model. Failure to solve a particular model is typically manifested by instability in the calculation and a failure of the model to converge. This paper presents a new approach ...
H. Lee, and J.V. Clark
Purdue University, West Lafayette, IN, USA
In this paper we present a method to mitigate the effect of thermally-induced noise in Micro-Electro-Mechanical Systems (MEMS) through a force feedback circuit. Inherent noise-induced vibrations, which would be inconsiderable in macro scale, are considered as a limitation in micro- and nano- scale since it diminishes the high performance of MEMS devices. For instance, depending on the stiffness ...
Middle East Technical University
In this study, a detailed finite element model coupling the motion dynamics and electromagnetics of a diaphragm based MEMS vibration energy harvester is presented. The energy harvester converts low frequency vibrations to high frequency response by magnetic actuation of a diaphragm carrying coils. AC/DC, Solid Mechanics and Moving Mesh (ALE) modules are coupled together in one 3-D model to ...