Papers – Page 1034 – TechConnect Briefs

Non-Isothermal Gas Flow Through Rectangular Microchannels

Sharipov F., Universidade Federal do Parana, BR

The mass flow rate of a rarefied gas through a long rectangular channel caused by both pressure and temperature differences has been calculated applying the S model kinetic equation. The calculations have been carried out [...]

Numerical Simulation of Boiling in a Porous Medium by Using Two-Phase Approach

Bourbon C., Milisic V., MASTER-ENSCPB Laboratory, FR

The paper presents the results of a numerical study of heat and mass exchanges inside a porous matrix. The porous medium is in contact with a solid surface heated over boiling point and steeped in [...]

Hydrodynamic Dispersion of a Neutral Non-Reacting Solute in Electroosmotic Flows

Griffiths S.K., Nilson R.H., Sandia National Laboratory, US

To investigate hydrodynamic dispersion in electroosmotic ?ow, we have derived an asymptotic series solution for the problem of two-dimensional species transport in a tube or channel. This solution is applicable to the late-time diÆusive and [...]

Microvalve Analysis: Wall Shear and Diffuser Effects

Carmona M., Marco S., Samitier J., Acero M.C., Plaza J.A., Esteve J., University of Barcelona, ES

This work deals with the analysis of silicon passive microvalves. The analysed microvalves consist of a circular central mass suspended by two flexible beams anchored on a pyrex substrate. The mechanical and fluidic analysis are [...]

Dynamics in a Thermal Ink Jet: A Model for Identification and Simulation

Rembe C., aus der Wiesche S., Hofer E.P., University of Ulm, DE

In this paper a newly developed model for identification and simulation of dynamic phenomena in a thermal ink jet is presented. As a result of the modeling the calculation of the pressure propagation in the [...]

Prediction of the Pressure Drop Through Micromachined Particle Filters

Yang J.M., Yang X., Yang J.M., Yang X., Ho C-M., Tai Y-C., UCLA, US

Micro-filters are fabricated using MEMS technology, and both measurements and numerical calculations are carried out in order to estimate the power requirement in a micron-size particle collection process using the micro-filter. In order to numerically [...]

Modelling and Optimization of a Vaporizer for Inhalation Drug Therapy

de Heij B., de Rooij N.F., van der Schoot B., de Heij B., de Rooij N.F., Bo H., Hess J., University of Neuchätel, CH

We present a piezo-electrically driven droplet generator with a large number of nozzles working in parallel and operating in the Drop On Demand mode. This device is build as part of a system for Inhalation [...]

Simulation of (Self-) Priming in Capillary Systems Using Lumped Models

Sesterhenn M., Mellmann J., Löhr M., Stierle B., Strobelt T., Sandmaier H., University of Stuttgart, DE

In this paper, a toolbox of lumped models for simulating (self-)priming and emptying of complex capillary networks is presented. Each model is a kind of an all-in-one-model, that considers inertia, friction, gravitation and capillarity and [...]

Computer Simulations of Electrokinetic Mass Transport in Microfabricated Fluidic Devices

Ermakov S.V., Jacobson S.C., Ramsey J.M., Oak Ridge National Laboratory, US

A mathematical model and computer code for simulat-ing electrokinetic fluid and sample manipulations in micro-fabricated fluidic devices (microchips) are described. The model accounts for mass transport mechanisms such as electrophoretic migration, bulk fluid motion due [...]

Stability Criterion for Microscale Concentric Flow of Two Immiscible Liquids

Ho L.W., Marchetti J., Gallegos C., IntelliSense Corporation, US

This paper addresses the establishment of a stability criterion for isothermal laminar concentric flow of two immiscible liquids. Using the approach of combined non-dimensional group anlysis and numerical simulations, it is established that the inner [...]