Papers:
Analytical Analysis of a Squeeze Film Dominated MEMS Fluid Ejector
We present an analytical model for predicting the behavior of a squeeze film dominated MEMS fluid ejector. The device consists of a piston that moves parallel to an orifice plate, with a thin film of [...]
A Miniature Laser Interferometer for Noninvasive Viscometry
A miniature laser interferometer consisting entirely of an optical fiber held in close proximity to a fluid surface is described. The total path difference in this interferometer is less than a millimeter. The interferometer may [...]
Optimal Shape Design of Pressure-Driven Curved Micro Channels with Hydrophilic and Hydrophobic Walls
In microfluidic applications such as LOC, 90-deg. and 180-deg. curved channels are frequently used to supply long flow passage in a compact volume. In most curved channels, the part connecting two straight channels is made [...]
Accurate Analytical Models of Fluid Friction in Rectangular Microchannels
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 [...]
Simulation and Optimization of Tesla Valves
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. [...]
Modeling of Surface Tension in Fluidic MEMS Using the Level-Set Method
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 [...]
Numerical Simulation of Electroosmotic Flow in Micro Channels with Analytical Integration of Surface Potential
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 [...]
Electroosmotic Pumping of Nonconducting Liquids by Viscous Drag from a Secondary Conducting Liquid
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 [...]
Hierarchical Finite Element Simulation of Perforated Plates with Arbitrary Hole Geometries
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 [...]
Low Damping Differential-Capacitive Sensing Comb
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 [...]
Modeling of the Kinetics of Capture of Pathogens Enhanced by a Marangoni Flow
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 [...]
Modelling Annular Micromixers
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 [...]
Surface Micromachined Viscous Spiral Pump
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 [...]
A Simple Description of Turn-induced Transverse Field Dispersion in Micrlfluidic Channels for System-Level Design
This abstract shows a simple analytical model for turn-induced dispersion that captures an essential aspect of the transition field from uniform to circumferential that has been ignored in prior simple descriptions. The model applies directly [...]
A Computational Model for Simulation of Electroosmotic Flow in Microsystem
Electroosmotic flow is created by applying an external electrical field on the electrical double layer (EDL) formed due to the interaction of an electrolyte solution with dielectric surfaces. This kind of flow plays an important [...]
Modular Silicon Micropump
A new micropump mechanism has been created that consists of two silicon/silicon oxide dies with vias and dome-shaped membranes. The membranes are bonded face-to-face to form variable-volume domed liquid chambers. The membranes increase and decrease [...]
Simulation and Optimization of Colloidal Micropumps
A fast algorithm for particulate microflows has been used to simulate the 3D micro-colloidal pumps tested in the experiments conducted by Terray et al. The Force-Coupling Method and a penalty method were implemented in a [...]
Numerical Simulation of Field Amplified Sample Stacking in Microfluidic System
In this paper we developed a numerical simulation method that solves the transport phenomenon associated with sample stacking in microchip-based separation system. The model is based on thin double layer approximation where the electrostatic force [...]
Numerical Simulation of Microfluidic Flow Using a Combination of Micro and Macro Computational Techniques: Scaling Issues
Recent literature has demonstrated the possibilities of using configurable surfaces to enhance the flow of fluids in MEMS devices. Not only are surface properties important in fluid delivery, the inherent problems of mixing by diffusion [...]
Simulation of a Polymer Drop in a Shear Field with Dissipative Particle Dynamics Method
In the present study, the dynamics of polymer drops in micro channel under both steady state and transient shear flow conditions are investigated using Dissipative Particle Dynamics method. The polymer drop is made from finitely [...]
Topology Trade-offs in the Synthesis of Chip-based Electrophoretic Separation Systems
Micro-scale electrophoretic separation systems provide a highly effective, versatile and inexpensive method for separating a wide variety of chemical components. Particularly useful applications include separation of biological molecules, chemical sensing, and mobile drub delivery systems. [...]
CFD-based Optimization of Gas/Liquid Microreactors with Droplet and Bubble Transport
Microreactors offer unique opportunities for the control of process parameters unparalleled by macroscopic equipment. A new gas/liquid microreactor is proposed allowing for fast mass transfer and small concentration gradients as well as a very narrow [...]
Quasi-static Motion of Bubbles in Microchannel Contractions
We present a thorough theoretical and computational study of bubble dynamics in icrofluidic channels with contractions. We investigate the effects of geometry and surface physics (friction and contact angle) on the behavior of incompressible bubbles, [...]
Layout Verification by Extraction for Micro Total Analysis Systems
The increasing complexity of MicroTotalAnalysis Systems is leading to a growing need for verification tools for such designs. Numerical simulation of such designs are slow, memory consuming and practically impossible for large designs. Schematic-based simulation [...]
Journal: TechConnect Briefs
Volume: 1, Technical Proceedings of the 2003 Nanotechnology Conference and Trade Show, Volume 1
Published: February 23, 2003
Industry sectors: Medical & Biotech | Sensors, MEMS, Electronics
Topic: Micro & Bio Fluidics, Lab-on-Chip
ISBN: 0-9728422-0-9