Micro Fluidics and Nanoscale Transport

Nano-structure and Phase Transitions in the Liquid Phase of Metallic and Non-metallic Elements

Vezzoli G.C., Institute for the Basic Sciences, US

The generally accepted version of the structure of the liquid phase is that of a single "homogeneous" phase, with a structure which is more or less homogeneous throughout the pressure-Temperature (p-T) field in which it [...]

Application of Local Radial Basis Function-based Differential Quadrature Method in Micro Flows

Xu D., Ding H., Shu C., Agency for Science Technology and Research, SG

Numerical simulation of flows in micro geometry is one of the most appealing fields in computational fluid dynamics due to the advent of MEMS. In the present study, a local Radial Basis Function-based Differential Quadrature [...]

Numerical Visualization and Quantification of Chaotic Mixing for Micromixers

Kang T.G., Kwon T.H., Pohang University of Science and Technology, KR

We present a systematic way of visualization and quantification of mixing in chaotic micromixers with a periodic mixing protocol. We name it colored particle tracking method, which consists of three steps. One is flow analysis [...]

A Low Cost Polymer Based Piezo-Actuated Micropump for Drug Delivery System

Liu H., Tay A.A.O., Wan S.Y.M., Lim G.C., Institute of Materials Research & Engineering, SG

This paper presents the design, realization and simulation of a novel polymer based check-valve micropump actuated by piezoelectric disc. Comparing with silicon substrate, polymer materials have such advantages as flexibility, chemical and biological compatibility, 3D [...]

Galilean Invariant Viscosity Term for an Athermal Integer Lattice Boltzmann Automaton in three Dimensions

Geier M.C., Greiner A., Korvink J.G., IMTEK, Albert Ludwigs University Freiburg im Breisgau, DE

The athermal lattice Boltzmann automata (LBA) are promising replacements for Navier Stokes solvers in computational fluid dynamics (CFD). They are inherently parallel, scale exactly linear with the number of computational elements and can be applied [...]

Liquid Disintegration: Investigation of Physics by Simulation

Zeng J., Korsmeyer T., Coventor, Inc., US

Liquid disintegration includes the processes of formation of droplets and droplet fission. It is important in inkjet printing and in the miniaturization of biochemical analytical devices. This paper reports on an investigation of the mechanism [...]

Capillary Passive Valve in Microfluidic System

Cho H., Kim H-Y, Kim T.S., Kang J.Y., Kim H-Y, Kim T.S., Microsystem Research Center, Korea Institute of Science and Technology, KR

This work reports the theoretical and experimental investigations of capillary bust valves to regulate liquid flow in microchannels. The theoretical analysis uses the Young-Laplace equation and geometrical considerations to predict the pressure at the edge [...]

Clogging Pressures of Bubbles in Microchannel Contractions: Theory and Experiments

Jensen M.J., Wang X., Attinger D., Bruus H., Mikroelektronik Centret, DTU, DK

We present a theoretical, numerical, and experimental study of bubbles passing through a microchannel contraction. A certain pressure, the so-called clogging pressure, is needed to push a bubble through a microchannel contraction. We present the [...]

In-Plane Micropump: Design Optimization

Sin J., Lee W.H., Stephanou H.E., RPI, US

This paper presents the fabrication, analysis and optimization of a novel monolithically fabricated diaphragm micropump, referred to as an in-plane micropump. Compared to previous technology, the micropump in this paper is fabricated to have all [...]

Analysis of Blood Extraction from a Lancet Puncture

Kuriger R.J., Romanowicz B.F., CFD Research Corporation, US

A computational model was created utilizing the CFD-ACE+ software to model blood flow from a lancet puncture of the skin. A two-dimensional axisymmetric model was developed and the skin tissue was modeled as a porous [...]

Polymeric Micropump with SU-8 Check Valves Assembled by Lamination Technique

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

This paper presents the first micropumps assembled using polymeric lamination technology. Each pump consists of two 100-m-thick, 10-mm-diameter SU-8 discs; two 1.5-mm-thick, 15-mm-diameter polymethylmethacrylate (PMMA) discs; and one piezo disc. The SU-8 parts were fabricated [...]

Electrokinetic Instability Mechanism of Double-layered Miscible Fluids with Different Electrolyte Concentrations in DC Electric Field

Park J.W., Kang K.H., Huh K.Y., Pohang University of Science and Technology, KR

Interfacial instability has recently been observed for DC-powered electroosmotic flow by Chen and Santiago [1]. So far, no plausible explanation has yet been made since the phenomenon is contrary to common belief of laminar flow [...]

Flow Simulation of a Microfluidic Analog of the Four-Roll Mill

Phelan_Jr. F.R., Hudson S.D., NIST, US

The fluid dynamics of geometries for liquid state materials characterization in microfluidic devices are investigated. A pressure driven device using microchannels is sought that has an adjustable flow type, approximating the function of the four-roll [...]

SOI Processing of a Ring Electrokinetic Chaotic Micromixer

Zhang Y.T., Chen H., Mezic I., Meinhart C.D., Petzold L., MacDonald N.C., university of california, santa barbara, US

Micromixing has been an active research area in the past decade due to the rapid expanding application of the lab-on-a-chip system in life science. Using the silicon bulk micromachining technology, a ring electroosmotic micromixer, which [...]

Spacific Flow Control Systems Using IR Laser Induced Sol-Gel Transfer of Hydrogel

Tanaka J., Shirasaki Y., Tatsuoka M., Funatsu T., Watabe S., Shoji S., Edura T., Mizuno J., Wada Y., Waseda University, JP

High efficient IR laser induced sol-gel transfer of hydrogel is applied for the microfluidic systems. High performance biomolecules sorting systems using T-shaped microchannel including IR absorbers were realized. By using Mebiol GelTM as the carrier, [...]

Optimization of Mixing in an Active Micromixing Device

Mathew G., Mezic I., Serban R., Petzold L., university of california, santa barbara, US

Microscale mixers can be divided into two broad classifications - passive and active. Passive mixers rely on geometric properties of the channel shape whereas active mixers rely on time-dependent perturbation of the fluid flow to [...]

Droplet Movement Induced by Nano Assembled Molecules And Micro Textures

Tseng F-G, Chien S.C., National Tsing Hua University, ESS Dept., TW

This paper introduces a droplet movement method on top of a surface prepared by gradient nano-scale self-assembled molecules on micro sized textures. Experimental results demonstrate the contact angles on hydrophobic surfaces without/with micro posts increase [...]

Analysis of AC-Driven Electroosmotic Flow in a Microchannel Packed with Microspheres

Kang Y.J., Yang C., Huang X.Y., Nanyang Technological University, SG

This paper presents a theoretical study on the AC-driven electroosmotic flow in both open and closed cylindrical microchannels packed with uniform microspheres. The time-periodic oscillating electroosmotic flow in an open microchannel in response to the [...]