Micro & Bio Fluidics, Lab-on-Chip – Page 55

Finite Element Modeling of a Microhotplate for Microfluidic Applications

Manginell R.P., Rosato D.A., Benson D.A., Frye-Mason G.C., Sandia National Laboratory, US

A hand-held chemical laboratory (mChemLab) is being developed that utilizes a silicon- nitride-supported microhotplate in the front-end, gas sampling and preconcentration stage. Device constraints include low-power (<200mW at 5V), rapid heating (<20msec), and a relatively [...]

Modeling of the Piezoelectric Micropump for Imporving the Working Parameters

Nedelcu O.T., Moagar-Poladian V., IMT-Bucharest, RO

In this paper a modeling for the flow of viscous liquids and a way to improve the piezoelectric micropump efficiency are described, in order to find the most convenient set of hydraulic parameters. The main [...]

Nanosecond Range Heating and Temperature Measurement on Thin Layers Experiment and Simulation

Moritz W., Roth U., Heyde M., Rademann K., Reichling M., Hartmann J., Humboldt Universitat zu Berlin, DE

A chemical semiconductor sensor for oxygen gas was activated by thermal treatment. The thin Pt layer of the n-Si/SiO2/Si3N4/LaF3/Pt field effect structure was used as the gate electrode for sensitivity measurements, heating resistance and temperature [...]

Development of CAD Model for MEMS Micropumps

Arik M., Zurn S.M., Bar-Cohen A., Nam Y., Markus D., Polla D., Univeristy of Minnesota, US

This paper describes development of a Computer Aided Design Model for MicroElectroMechanical Systems. Finite Element Analyses have been completed successfully to understand the physical nature of the sample MEMS devices. Numerical results have been supported [...]

Applications: Micropumps, Heaters, Coolers

Numerical Simulations of Flat-Walled Diffuser Elements for Valveless Micropumps

Olsson A., Stemme E., Stemme G., Stemme E., Stemme G., Royal Institute of Technology, SE

The flow directing capability of micromachined flat-walled diffuser elements for valve-less micropumps have been investigated. The diffuser element is a small angle flow channel with a rounded inlet and a preferably sharp outlet. The diverging-wall [...]

The Valveless Diffuser Pump-A Numerical Design Study Using MATLAB

Olsson A., Stemme E., Stemme G., Stemme E., Stemme G., Department of Signals, Sensors and Systems, SE

A lumped-mass model is used to improve the design of the valveless diffuser pump. The model is implemented using MATLAB and tested for different previously reported pumps. The flow-pressure characteristics are predicted for different excitation [...]

Characterization of DNA Flow through Microchannels

Shrewsbury P.J., Muller S.J., Liepmann D., University of California-Berkeley, US

Advances in silicon fabrication technology enable the reproduction of laboratory apparatus, and theoretically biochemical processes, on a microscale. The implementation of this technology, however, necessitates additional study as fluid dynamics change at this scale and, [...]

Simulation of Micro-Channel Heat Sinks for Optoelectronic Microsystems

Kreutz E.W., Pirch N., Ebert T., Wester R., Ollier B., Loosen P., Poprawe R., Rheinisch-Westfälische Technische Hochschule Aachen, DE

Water-cooled heat sinks are investigated both experimentally and theoretically as model systems to simulate the energy and mass transport in devices used for cooling of diode lasers. The design of the micro-channel heat sinks yields [...]

Coupled Fluid-Thermal-Structural Simulations in Microvalves and Microchannels

Athavale M.M., Yang H.Q., Przekwas A.J., CFD Research Corporation, US

This paper presents the results of high-fidelity, 3-D simulations of coupled flow, heat-transfer and structural mechanics simulations of microchannels, micropumps, microvalves, and time-accurate simulations of a microoscillator. In each of these cases, the simulated results [...]