J.H. Park, and P. Krstic
Oak Ridge National Laboratory, Oak Ridge, TN, USA
Ionic current through an electrolyte filling a carbon nanotube (CNT) is characterized by unusually high current values, due to the strong slip of the fluid at the inner surface of the nanotube, as well as of a dominating role of electro-osmotic component. Using COMSOL, we explore the fundamental features of this phenomenon with respect to the CNT length and excess charge inside the tube. COMSOL ...
Characterization of an AlGaN/GaN Electrostatically Actuated Cantilever Using the Finite Element Method
N. DeRoller, M. Qazi, J. Liu, and G. Koley
University of South Carolina, Columbia, SC, USA
AlGaN/GaN heterostructures are unique because the 2DEG at the interface is created by the difference in polarization properties of the AlGaN and the GaN layers; not due to intentional doping. In this work, a 3D model of an electrostatically actuated micro cantilever has been developed using COMSOL for characterization using the finite element method (FEM). The microcantilever has AlGaN/GaN HFET ...
J. Stang, B. Fowlkes, M. Moghaddam, O. Kripfgans, and P. Carson
University of Michigan, Ann Arbor, MI, USA
A transcutaneous thermal therapy system is being developed for the targeted treatment of breast cancer cells using focused microwaves as an adjuvant to surgery, radiation, chemotherapy, and high intensity focused ultrasound (HIFU). Prior imaging studies are used to ascertain the material properties of the breast tissue, and this data is incorporated into a COMSOL Multiphysics model. Time ...
J.V. Clark, F. Li, and A. Shankar
Purdue University, West Lafayette, IN, USA
In this paper we present a computational study on energy harvesting for microid microrobots. We examine the feasibility of extracting energy from the ambient environment through the piezoelectric legs of the microid. Microids are microrobots that have insect like dexterity. The microid’s use in remote locations makes it imperative for it to be able to recharge itself. Clark et al. presented a ...
A. Cyganowski, H. Leidecker, J. Brusse, L. Panashchenko, and T.E. Schmidt
Rensselaer Polytechnic Institute, Troy, NY, USA
NASA Goddard Space Flight Center, Greenbelt, MD, USA
St. Mary's College of Maryland, St. Mary's City, MD, USA
Metal foil resistors are often chosen for NASA space flight applications due to their high precision and stability. COMSOL Multiphysics is used to develop a test that screens out metal foil resistors containing gridline defects. The resistors will be subjected to repeated short duration electrical pulses that induce localized heating and fatigue only in areas with constrained gridlines. The pulse ...
S. Maloney[1,2], Y. Li[1,2], G. Auner, and J. Smolinski
Wayne State University, Detroit, MI, USA
Lawrence Technological University, Southfield, MI, USA
We are working on a microfabricated lysing chip that uses a piezoelectric actuator to provide ultrasonic energy to break apart cells. The device contains pillars with varying dimensions. We hypothesize that increasing the aspect ratio of pillars will increase the efficiency of the transfer of ultrasonic energy into the fluid phase and enhance the lysing efficiency. The fluid structure ...
E. Weststrate, M. Steinback, N. Rensing, and T. Tiernan
Radiation Monitoring Devices Inc., Watertown, MA, USA
Passing alternating current through a wire placed just above a conducting surface induces eddy currents in that surface. Any cracks present in the conductor modify the eddy current distribution, creating a magnetic field signature unique to the crack. This magnetic signature can be detected by placing magnetic field sensors such as magnetoresistive sensors or inductive loop pickups in close ...
P. Mahanti, M. Keebaugh, N. Weiss, P. Jones, M.A. Hayes, and T. Taylor
Arizona State University, Tempe, AZ, USA
Particle velocimetry using image analysis is an effective non-intrusive method used for fluid velocity field estimation in micro-channels. We use COMSOL with MATLAB to generate velocity fields for micro-channel designs and then calculate changes in particle position for given imaging parameters. This is used to simulate images which can then be used to verify an algorithm\'s performance before ...
J. Xiao, and D. Attinger
Columbia University, New York, NY, USA
Convective deposition is a material processing technique where an evaporating meniscus of a colloidal suspension is dragged along a solid substrate to deposit layers of micro or nanoparticles. The process is a typical multiphysics process where fluid dynamics, mass and heat transfer come into play in a small deforming domain. In this work, we describe an Arbitrary Lagrangian-Euler model ...
S. Liu, P. Wang, and H. Sun
University of Massachusetts Lowell, Lowell, MA, USA
In this paper we study the porous media coating (PMC) effect on the surface acoustic wave (SAW) sensor for chemical detection. Intensive research for SAW sensor is focused on using high surface polymer coating such as nanofibrous film to improve the sensitivity and to shorten response time for in situ trace level detections. A theoretical analysis shows the PMC can provide a higher and faster ...