Papers – Page 31 – TechConnect Briefs

Simulation of Electro-Osmotically Driven Microsythesis Systems

Oosterbroek R.E., Goedbloed M., van den Berg A., University of TWente, NL

Modeling, optimization, and the realization of an electroosmotically driven chemical microsynthesis system for Wittig reactions are presented. Essential for good functioning of the chemical liquid reaction system is controllability of the supplied chemicals, independently of [...]

Electroosmotic Flow and Zone Broadening in Microfluidic Channels of Variable Cross-Section and Wall Charge

Ghosal S., Lu Z., Northwestern University, US

Electroosmotic flow is often the method of choice for generating fluid flows in micro fluidic devices. The resulting flow has a characteristic at profile which has the advantage of very low axial dispersion. This is [...]

Squeezing Flow of Particles and Large Molecules Suspended in a Liquid Through Nanochannels

Acrivos A., Khusid B., Koplik J., Drazer G., New Jersey Institute of Technology, US

The presentation addresses the status of current understanding of the hydrodynamic phenomena accompanied the motion of a nanometer-sized particle through a nanotube.

Simulation of Electrically-Excited Flows in Microchannels for Mixing Application

Meisel I., Ehrhard P., Forschungszentrum Karlsruhe GmbH, DE

In the present paper we propose a method for improved mixing in microchannels. The basic idea is to excite a secondary vortex flow around an obstacle within the micromixer by applying an external oscillatory electrical [...]

A Compact Model for Flowrate and Pressure Computation in Micro-fluidic Devices

Qiao R., Aluru N.R., University of Illinois at Urbana-Champaign, US

A compact model to compute flowrate and pressure in micro-fluidic devices is presented. The micro-fluidic flow can be driven by either an applied electric field or by a pressure gradient or both. In the proposed [...]

Simulation of Hydrodynamic Dispersion in Gas/Liquid Microreactors

Hardt S., Doffing F., Pennemann H., Institut für Mikrotechnik Mainz GmbH, DE

Dispersion and spreading of concentration signals in gas/liquid microreactors is studied with methods of computational fluid dynamics (CFD). It is shown that conventional reactor designs exhibit a broad residence-time distribution due to convective signal dispersion. [...]

System Performance Evaluation with SystemC for Two PCR Microelectrofluidic Systems

Zhang T., Chakrabarty K., Fair R.B., Cadence Design Systems, Inc., US

We present a performance comparison between two types of microfluidic systems - continuous-flow systems and droplet-based systems. The comparison based on a specific microfluidic application - a polymerase chain reaction (PCR) system. The modeling and [...]

Novel Microfluidic Jet Deflection: Significant Modeling Challenge with Great Application Potential

Delametter C.N., Trauernicht D.P., Chwalek J.M., Eastman Kodak Company, US

A novel method is described for deflecting a liquid jet emanating from an orifice having a diameter of approximately ten microns. While awkward mechanical valves or unwieldy electrodes can be used to deflect a jet, [...]

Numerical Modeling of Ferrofluid Flow Instabilities in a Capillary Tube at the Vicinity of a Magnet

Berthier J., Ricoul F., LETI, FR

The use of ferrofluids is now foreseen to be important for microfluidic systems and biotechnological microsystems as microvalves, micropumps or for the control and synchronization of the flow. The advantage lies in the possibility of [...]

Numerical Analysis of a Microfluidic Oscillator Flowmeter Operating with Gases or Liquids

Simões E.W., Furlan R., Pereira M.T., Laboratório de Sistemas Integráveis - Escola Politécnica da Universidade de São Paulo, BR

We analyzed microfluidic oscillators operating with liquids (water, isopropilic alcohol, and acetone) or gases (nitrogen, argon, and carbon dioxide), using numerical simulation. The possible applications include rapid measurement and control of low fluid flows in [...]