Papers – Page 39 – TechConnect Briefs

Surface Micromachined Viscous Spiral Pump

Kilani M.I., Galambos P.G., Haik Y., Chen C-J., Florida State University, US

This paper introduces a new viscous micropump produced using surface micromachining technology. The pump consists of a disk with a spiral protrusion that rotates at a close proximity over a stationary plate. Fluid contained in [...]

Modelling Annular Micromixers

Gleeson J.P., Roche O.M., West J., Gelb A., University College Cork, IE

The search for efficient mixing methods in the low Reynolds numbers flows typical of lab-on-a-chip technology has led us to propose an annular magnetohydrodynamic micromixer, currently under construction at the NMRC. In this talk we [...]

Modeling of the Kinetics of Capture of Pathogens Enhanced by a Marangoni Flow

Pham P., Achard J.L., Berthier J., Ginot F., CEA-LETI, FR

Binding of targetted biomolecules, pathogens or analytes on a reactive surface is commonly used for biodiagnostic systems. However the process is slow and inefficient if one relies only on molecular diffusion to transfer the analytes [...]

Low Damping Differential-Capacitive Sensing Comb

Yeon S.C., Jeon Y.K., Kim Y.H., Seoul National University, KR

In the present study, a specially designed sensing comb is proposed for low damping and high capacitance. Many researchers have proposed high aspect ratio single crystal silicon structure to improve sensitivity in capacitive sensing and [...]

Hierarchical Finite Element Simulation of Perforated Plates with Arbitrary Hole Geometries

Råback P., Pursula A., Junttila V., Veijola T., CSC - Scientific Computing, FI

The squeezed-film-damping of micro-electro-mechanical devices may be reduced by creating a number of small holes into the structure. Unfortunately, in the simulation of the devices it is possible to consider only a few holes in [...]

Electroosmotic Pumping of Nonconducting Liquids by Viscous Drag from a Secondary Conducting Liquid

Brask A., Goranovic G., Bruus H., Technical University of Denmark, DK

A novel electroosmotic pump design relying on two-liquid viscous drag to pump nonconducting liquids is presented and analyzed theoretically. A conducting pumping liquid driven by electroosmotic flow (EOF) drags a nonconducting working liquid by viscous [...]

Numerical Simulation of Electroosmotic Flow in Micro Channels with Analytical Integration of Surface Potential

Chen Z., Athavale M., Przekwas A., CFD Research Corporation, US

We have developed a new methodology to simulate electroosmotic flows in micro channels, which allows us to accurately produce the effects of the double layer without resolving it. The method is a subgrid type model [...]

Modeling of Surface Tension in Fluidic MEMS Using the Level-Set Method

Takahashi K., Kyushu University, JP

Mixed state of liquid and gas is frequently seen in fluidic MEMS, for example, ink jet printer, heat exchanger, thermo-capillary optical switch, and so on. The surface tension is the most dominant mechanical effect in [...]

Simulation and Optimization of Tesla Valves

Truong T-Q, Nguyen N-T., Nanyang Technological University, SG

Tesla valve is a no-moving-parts valve. It has many advantages over conventional checkvalves in microscale. However, there has been very few literatures discussing its optimization. Systematic construction of the valve’s geometry has not been reported. [...]

Accurate Analytical Models of Fluid Friction in Rectangular Microchannels

Tchikanda S.W., Nilson R.H., Griffiths S.K., Sandia National Laboratories, US

Liquid flow in microchannels is important to a number of technologies including cooling of microelectronics by heat pipes and capillary pumped loops as well as capillary wetting of channels in molding processes and in chip-based [...]