Papers – Page 693 – TechConnect Briefs

Numerical simulation of the droplet generation mode transition of the co-flowing liquids in micro-channel

Hua J.S., Cheng M., Liu T.G., Institute of High Performance Computing, SG

A front tracking method based multiphase flow simulation (Unverdi and Tryggvason, 1992) is adopted to investigate the transition mechanism of droplet formation modes of dripiing and jetting. The numerical method solves a single set of [...]

Drop formation mechanisms in piezo-acoustic inkjet

Wijshoff H.M.A., Océ Technologies B.V., NL

Drops are generated with a piezo inkjet device. A piezo actuator drives each channel. Drops are measured with stroboscopic illumination or high-speed camera recordings. The phenomena inside the channels are hard to measure. Modeling give [...]

Numerical Analysis of Nonlinear Deformation and Breakup of Slender Microjets with Application to Continuous Inkjet Printing

Furlani E.P., Eastman Kodak Company, US

Liquid microjets are inherently unstable and can be modulated in a controlled fashion to create steady streams of picoliter-sized droplets at frequency rates in the hundreds of kilohertz. Such modulation has been achieved using CMOS/MEMS [...]

Novel Electro Magnetic Micro Pump

Feldmann M., Demming S., Büttgenbach S., Institute for Microtechnology, DE

The mergence of partial aspects and functional components of micro actuators and micro fluidic technology allows the development of complex micro systems. This enormous potential is shown in this article by the realization of an [...]

A Rapid Prototyping and Mass-Production Platform of Microfluidic Devices

Craig Kung P., Kung Y.L., Holcombe D., Grace R.H., Ungelenk G., Piechotka E., Seiferth W., Optotrack, Inc., US

Microfluidic chips, disposable biosensors, and micro-optical devices have been primarily manufactured from silicon- or glass-based substrates for years. This approach involves sophisticated production tools, tedious development processes, and clean-room conditions. Given today’s fierce competition in [...]

Particle Electrophoresis in Closed-both-end Capillary and Likely Charged Particle Aggregation Induced by AC Electric Field

Qiu Z.Y., Shen Y., City College of New York, US

Electroosmosis flow (EOF) is a critical issue in electrophoresis separation techniques. The magnitude of EOF problems and difficult level of its solution are demonstrated by 33 issued US Patents on different methods to suppress or [...]

Fixed-Valve Micropump Simulation and Optimization

Forster F.K., Walter T., University of Washington, US

Membrane pumps with fixed-geometry valves are ex- tremely simple to fabricate and have the potential to be highly reliable and cheap due to their simplicity. We have recently implemented a means of optimizing design parameters [...]

Chaotic mixing using periodic and aperiodic sequences of mixing protocols in a micromixer

Kang T.G., Singh M.K., Kwon T.H., Anderson P.D., Eindhoven University of Technology, NL

We conducted a numerical study on mixing in a barrier embedded micromixer with an emphasis on the effect of periodic and aperiodic sequences of mixing protocols on mixing performance. A mapping method was employed to [...]

Microfluidic Valve-Controllable Magnetic Bead Receptacle: A Novel Platform for DNA Sequencing

Esfandyarpour H., Davis R.W., Stanford Genome Technology Center, US

In this paper, a novel and effective microfluidic platform for DNA Sequencing, particularly for sequencing-by-synthesis methods such as Pyrosequencing, based on valve-controllable PDMS channel system contains micrometer magnetic beads . Additionally, the proposed picoliter micofluidic [...]

Filtration and emulsification with nanoengineered membranes

van Rijn C.J.M., Nijdam W., University of Wageningen, NL

With microengineering techniques it is possible to manufacture very precise perforated membranes. The pores, which are well defined by photolithographic methods, allow accurate separation of particles by size. The membrane thickness is usually smaller than [...]