An AC Magnetohydrodynamic (MHD) micropump has been demonstrated in which the Lorentz force is used to propel an electrolytic solution along a microchannel etched in silicon. This micropump has no moving parts, produces a continuous (not pulsatile) flow, and is compatible with solutions containing biological ...

. F. Bohringer, "A Ferrofluidic Magnetic Micropump," J. Microelectromech. Syst., vol. 10, pp. 215�221, 2001. [22] A. V. Lemoff and A. P. Lee, "An ac magnetohydrodynamic micropump," Sensors Actuators B, vol magnetohydrodynamic micropump," Sensors Actuators A, vol. 80, pp. ...

ELECTROOSMOSIS AND THERMAL EFFECTS IN MAGNETOHYDRODYNAMIC (MHD) MICROPUMPS USING 3D MHD EQUATIONS D. Patel: Electroosmosis and Thermal Effects in Magnetohydrodynamic (MHD) Micropumps Using 3D MHD in Magnetohydrodynamic (MHD) Micropumps Using 3D MHD Equations by Vaibhav D. ...

/V Power/mW Electrostatic micropump35 200 1 Thermo-pneumatic36 15 450 Magnetohydrodynamic micropump37 10 18 Bubble-type planar micropump38 40 1000 Ionic conductive polymer film Micropump39 1.5 180 Electroactive. Kluge, M. Richter and A. Richter, A bidirectional silicon ...

and thermal effects in magnetohydrodynamic (MHD) micropumps using 3D MHD equations 3 4 Vaibhav Patel, Samuel in revised form 28 April 2006; accepted 4 May 2006 8 Abstract9 Magnetohydrodynamics (MHD) micropumps which micropumps. Based on the numerical framework developed, we investigate ...

pumps,18,19 or catalytic micropumps.20,21 Some of these micropumps, however, are difficult to fabricate. Alternating current (AC) field micropumps have been reported that create net flow over asymmetric electrode on both sides of the channel creates a micropump that is powered by the global ...

Micropumping of biofluids by alternating current electrothermal effects Jie Wu,a Meng Lian, and Kai, effective micropumping and mixing still remain a challenge. Due to high surface/volume ratio at microscale fluids. Here we report a type of micropumps by ac electrothermal ACET effect. Pumping was demonstrated

A magnetohydrodynamic (MHD) micropump and microsensor which utilizes micromachining to integrate the electrodes with microchannels and includes a magnet for producing magnetic fields perpendicular to both the electrical current direction and the fluid flow direction. The magnet can also be micromachined and integrated with the ...

and proteins. AC electroosmotic flow can be utilized to create micropumps for micro-bio- chips [1]. As a result electroosmotic micropumps. ICEO [4] refers to a phenomenon in which a DC or AC electric field induces charge electrokinetic micropumps: The effect of geometrical confinement, Faradaic ...

unsuitable for biological applica- tions. Due to such drawbacks, the use of electrokinetic EK micropumps- clude dc and ac micropumps. In a dc pump electro-osmotic EO flow is induced by an external tangential of directed flow over the activated micropump. For more information on EPAPS, see http://www. aip

, universal decay of the mobility with bulk concentration c0, observed in KCl for ACEO micropumps [11. Lett. 100 058302 [10] Olesen L H, Bruus H and Ajdari A 2006 AC electrokinetic micropumps: the effect and Chang H C 2004 Electrokinetic micropump and micromixer design based on ac Faradaic ...

Orthogonal electrodes have been reported to produce high velocity microflows when excited by ac signals, showing potential for micropumping applications. This paper investigates the microflow reversal phenomena in such orthogonal electrode micropumps. Three types of microflow fields were observed by changing the applied electric ...

1 Supplementary Information Remotely Powered Self-Propelling Particles and Micropumps Based-268. [4] Debesset, S; Hayden, CJ; Dalton, C; Eijkel, JCT; Manz, A; An AC electroosmotic micropump

... Abstract : The theory of magnetohydrodynamic power generators is presented. ... sectional area flows; end losses; AC generation; cycle efficiencies ...

concentrator, micro-pumps and mixers by ACEO. Electro-osmosis typically refers to using DC potential to moving is important for optimizing the micropump and particle transportation. In contrast to electrophoretic AC Electrochemical Micropump, AIChE annual meeting 2004, Nov. 7 � 12, Austin, TX. 361 #12;

fluids, charged species and polarizable particles. DC electroosmotic micropumps [1, 2] have been employed injections in their analysis of ac electroosmotic micropumps. Induced charge electroosmosis (ICEO) refers micropumps. Sensors and Actuators B- Chemical, 2001. 79(2-3): p. 107-114. 3. Jacobson, S.C., et al., ...

DESIGN AND MODELING OF A PETAL-SHAPE, CONJUGATED POLYMER-ACTUATED MICROPUMP Yang Fang and Xiaobo the micropump, it is important to make the prototypes of different diaphragms for comparisons and predict the performance of the micropump. In this paper, a petal-shape design is proposed for the pump- Proceedings

to stabilize larger volumes (cf Sect. 3). The micropump was programmed by an external com- puter, which triggered the pumping start, controlled its flux and its duration. The micropump was automatically started-coating (b)(a) 10mm micropump Injector tube Fig. 1 a Vertical cross section of the injector tube. b Quasi

--We have developed micropumps for microfluidics that use AC electric fields to drive aqueous fluid motion, micropump I. INTRODUCTION Electrokinetic phenomena are important at micro/nanoscales, and can be used micropumps by taking advantage of these phenomena. IMECE2004-61836 2004 ASME International Mechanical

... 39. Debesset, S., Hayden, CJ, Dalton, C., Eijkel, JCT & Manz, A. An AC electroosmotic micropump for circular chromatographic applications. ...

bearings will be important in the development of micro- coolers, micropumps, microgenerators, and other

Orthogonal electrodes have been reported to produce high velocity microflows when excited by ac signals, showing potential for micropumping applications. This paper investigates the microflow reversal phenomena in such orthogonal electrode micropumps. Three types of microflow fields were observed by changing the applied electric ...

This review surveys the advances of microvalves, micropumps, and micromixers within PCR microfluidic chips over the past ten years. First, the types of microvalves in PCR chips are discussed, including active and passive microvalves. The active microvalves are subdivided into mechanical (thermopneumatic and shape memory alloy), non-mechanical (hydrogel, sol-gel, paraffin, and ...

Lab-on-a-chip devices require integrated pumping and fluid control in microchannels. A recently developed mechanism that can produce fluid flow is an integrated ac-electro-osmosis micropump. However, like most electrokinetic pumps, ac-electro-osmotic pumps are incapable of handling backpressure as the pumping force mechanism acts on ...

A microfluidic pump based on electroosmosis of the second kind was designed and fabricated. Experimental results using DC and AC voltages showed a close to second-order relationship between flow and voltage, in good agreement with theory. The experimental flow rates were considerably lower than the predicted maximum for the micropumps, which can be ...

In this paper, it is described that measurement of fluid flow generated by simultaneous operation of an infrared (IR) laser and AC electric field in a microfabricated channel. When an IR laser (1026 nm) was focused under an intense AC electric field, a circulating flow was generated around the laser focus. The IR laser and the electric field generate two ...

... AC MHD power generation was ... FEASIBILITY STUDIES, POWER, GENERATORS ... NOZZLES, MAGNETOHYDRODYNAMIC GENERATORS ...

Numerical simulations were made of a micro-pump with step electrodes. An AC voltage was applied to each pair of step electrodes. The existing numerical studies using linear assumptions have a limitation that the theory is limited to low external voltage, at most 25mV. However, the present study took into account the Steric effect which is recognized as a ...

Recent experiments have demonstrated that AC electrokinetic micropumps permit integrable, local, and fast pumping (velocities � mm/s) with low driving voltage of a few volts only. However, they also displayed many quantitative and qualitative discrepancies with existing theories. We therefore extend the latter theories to account for three experimentally ...

This paper reports dramatic improvements in flow rate over conventional alternating current (ac) electrokinetic micropumps by exploiting asymmetry in electric potentials over the electrodes. A micropump consisting of a planar asymmetric electrode array was tested using ac signals with and without a direct current ...

A comprehensive non-isothermal Lattice Boltzmann (LB) algorithm is proposed in this article to simulate the thermofluidic transport phenomena encountered in a direct-current (DC) magnetohydrodynamic (MHD) micropump. Inside the pump, an electrically conducting fluid is transported through the microchannel by the action of an electromagnetic Lorentz force ...

ac electro-osmosis (ACEO) has emerged recently as a promising strategy for fluid transport at microscale. With an array of planar interdigital electrodes immersed in an electrolyte, different charging mechanisms at electrode/electrolyte interface and electrokinetic surface flows can be induced by nonuniform electrical fields. To implement ACEO micropump, ...

The article discusses the possibilities of changing electrical DC-energy obtained in MHD (magnetohydrodynamic) generators with Hall, Montardy and Faraday connection systems into tri-phase AC energy. It presents diagrams of inverters built from thyristors ...

A microfluidic switch has been demonstrated using an AC Magnetohydrodynamic (MHD) pumping mechanism in which the Lorentz force is used to pump an electrolytic solution. By integrating two AC MHD pumps into different arms of a Y-shaped fluidic circuit, flow can be switched between the two arms. This type of switch can be used to produce ...

Recent experiments have demonstrated that ac electrokinetic micropumps permit integrable, local, and fast pumping (velocities �mm/s ) with low driving voltage of a few volts only. However, they also displayed many quantitative and qualitative discrepancies with existing theories. We therefore extend the latter theories to account for three ...

Magnetohydrodynamic (MHD) pumping has several attractive features including no-moving-parts operation, compatibility with biological solutions, and bi-directional pumping capability. In this work, a re-circulating ceramic MHD micropump is described. The MHD operation principle is based on the generation of Lorenz forces on ions within an electrolytic ...

. A slip silicone cover (SA8R-0.5, Grace Bio-Labs, USA) is sealed on the glass slide to form the chamber Erms is applied over a fluid body, energy is dissipated as 2 rmsEP = ( : electrolyte conductivity at high frequency. ACET effect occurs owing to the resistive property of the fluid, so its flow velocity

We present two different designs of electrohydrodynamic micropumps for microfluidic systems. The micropumps have no movable parts, and their simple design allows for fabrication by microsystems technology. The pumps are operated by ac voltages from 1to60V and were tested with aqueous solutions in the conductivity range of 1-112mSm?1 ...

We present two different designs of electrohydrodynamic micropumps for microfluidic systems. The micropumps have no movable parts, and their simple design allows for fabrication by microsystems technology. The pumps are operated by ac voltages from 1 to 60 V and were tested with aqueous solutions in the conductivity range of 1-112 mS ...

We present the design, test and theoretical analysis of a novel micropump. The purpose is to make a pump with large flow rate (approximately 10 microL min-1) and high pressure capacity (approximately 1 bar) powered by a low voltage DeltaV<30 V. The pump is operated in AC mode with an electroosmotic actuator in connection with a full wave rectifying ...

A micropumping device has been developed, which may find application in different areas such as blood pumping and chemical reagents dosing in bioengineering or as an efficient thermal management solution scheme in space-constrained electronic devices, due to some of their unique properties such as lower noise generation and ease of miniaturization. In this presentation, liquid ...

This paper deals with the mathematical modeling of traveling-wave ac electro-osmotic micropumps with a zig-zag arrangement of microelectrodes. A mathematical model based on the Poisson-Nernst-Planck-Navier-Stokes description is used in this study within the physically relevant ranges of the model parameters. We present an extensive set of parametrical ...

This paper deals with the mathematical modeling of traveling-wave ac electro-osmotic micropumps with a zig-zag arrangement of microelectrodes. A mathematical model based on the Poisson-Nernst-Planck-Navier-Stokes description is used in this study within the physically relevant ranges of the model parameters. We present an extensive set of parametrical ...

A microfluidic pump and mixer design based on ac faradaic polarization is proposed. Unlike ac electrokinetic devices based on capacitive charging of the electrodes, the design yields a net electro-osmotic flow for high-conductivity electrolytes at high voltages and frequencies without producing gas bubbles or generating pH gradients. The average velocity, ...

A magnetohydrodynamic generator using a nuclear material in the working fluid which is passed through a magnetic field during fission, is designed for the production of a-c power. The generator is similar to that described in British Patent 928,836, except that a-c is produced by cyclically varying the fission rate or the ...

The medical devices such as a micropump to extract blood through a tube have a structure which needle and pump part are mutually separated. Therefore, it is not easy to make smaller than the conventional pump. In this research, we aim to develop the pump combined with a tube as a final purpose. In this study, ring type PZT elements are mounted on the surface of the silicone ...

An all-polymer micropump was realized using the conductive polymer poly (3,4-ethylenedioxythiophene) (PEDT) as the active component. The pumping effect originated from an ac potential applied to an asymmetric array of interdigitated electrodes. The PEDT electrodes were fabricated using optical lithography and reactive ion etching, and dimensions down to 2 ...

An AC electrokinetic funnel flow is generated by a planar micro-coil resister design capable of sustaining 3500V without Faradaic reactions. The final line of the serpentine coil exhibits a transverse electro-osmotic slip velocity exceeding 1 cm/sec. Due to side boundaries, a large back pressure is established in the slip direction to produce an intense vortex cylinder. As the ...

AC electrokinetics has shown great potential for microfluidic functions such as pumping, mixing and concentrating particles. So far, electrokinetics are typically applied on fluids that are not too conductive (<0.02 S/m), which excludes most biofluidic applications. To solve this problem, this paper seeks to apply AC electrothermal (ACET) effect to ...

TrFE)] copolymer, based actuation micropump diaphragm (PAMPD) have been ... A lot of micropumps have been developed using several actuation methods such as ...

micropump which will be converted to a high pressure rise, long ... applications that require reliable, efficient micropumps include chemical ...

This paper investigates the phenomenon of Faradaic charging in ac electrokinetics. Faradaic reactions were suggested as a key effect responsible for the reversal of pumping direction in ac micropumps. However, this hypothesis has yet to be proven convincingly and directly. Here we present an ion detection strategy to determine the ...

Moving and manipulating bio-particles and fluids on the microscale is central to many lab-on-a-chip applications. Techniques for pumping fluids which use electric fields have shown promise using both DC and AC voltages. AC techniques, however, require the use of integrated metal electrodes which have a low resistance but can suffer from unwanted chemical ...

� ample, the operating frequency of a micropump chamber may be limited by the feasibility of phys� ical the behavior of the micropump since it determines the micropump flow rate. The major parts of the check valve h s L h Figure 2: Schematic view of the open valve of a micropump. The behavior of the cantilever

Analytical analysis of a circular PZT actuator for valveless micropumps Shifeng Li, Shaochen Chen the behavior of a piezoelectric microactuator for micropump applications. However, there is no reliable micropump. In this paper, a linear strain distribution is assumed across the thickness of the passive plate

Page 1. 71# FT-T-62 -1301 299673 TRANSLATION P-FCBLE4S OF X~'E'& R~-AC ID F=-UY. D-' Yx:CS Il FOREIGN TECHNOLOGY iii , DIVISONRA ...

Experimental and modeling work on the use of magnetohydrodynamic forces for separating particulate impurities from molten metals is described. Several experimental systems are described, which use ac or dc electromagnets and, thereby, either induced or direct currents to produce the required forces. Recommendations are made for further optimization of the ...

Microchannels, Micropumps, and. Integrated microcooling system. Silicon wafer ... of micropump technology. "02: Design, fabrication and testing of complete ...

... Punp ..... 28 6.4 Micropump Gear Type Fuel Pump ..... 28 ... by Micropump which will be discussed later. ...

We have built a dedicated lab on a chip to study the performance of an integrated electrokinetic micropump, driven by a low voltage AC signal. This micropump consists of an array of interdigitated electrodes and is here integrated in a microfluidic loop. We demonstrate that this device can pump continuously and reproducibly electrolyte ...

It is important to generate fast fluid flow yet maintain low temperature rise for ac electrothermal (ac ET) pumping in microsystems with conductive fluids. This has been generally the limitation of ac ET driven micropump applications. We present an enhanced ac ET pumping mechanism using low ...

We are developing AC electrokinetic micropumps to drive electrically conductive biological fluids in microchannels. These pumps work on the principles of Induced Charge Electroosmosis (ICEO) and flow Field Effect Transistor (flowFET) phenomena. AC (as well as DC) electric fields can induce electrical double layer on a polarizable ...

We have developed 2 different micropumping methods for transporting ionic fluids through microchannels. The first method is based on Induced Charge Electroosmosis (ICEO) and AC flow field-effect. We used an AC electric field to produce a symmetric ICEO flow on a planar electrode, called `gate'. In order to break the symmetry of ICEO, ...

ii The goal of the present thesis has been to investigate ways of controlling and manipulating fluids and suspensions in microfluidic systems. In particular, we focus on a theoretical description of AC electroosmotic micropumps with asymmetric electrode arrays, that have recently been demonstrated to permit fast pumping (velocities ? mm/s) with low driving ...

For the phenomenological description of magnetohydrodynamic turbulence competing models exist, e.g., Boldyrev [Phys. Rev. Lett. 96, 115002 (2006)] and Gogoberidze [Phys. Plasmas 14, 022304 (2007)], which predict the same Eulerian inertial-range scaling of the turbulent energy spectrum although they employ fundamentally different basic interaction mechanisms. A relation is ...

An internal combustion, liquid metal (LM) magnetohydrodynamic (MHD) engine and an alternating current (AC) magnetohydrodynamic generator, are used in combination to provide useful AC electric energy output. The engine design has four pistons and a double duct configuration, with each duct containing sodium ...

An internal combustion, liquid metal (LM) magnetohydrodynamic (MHD) engine and an alternating current (AC) magnetohydrodynamic generator, are used in combination to provide useful AC electric energy output. The engine design has-four pistons and a double duct configuration, with each duct containing sodium ...

Micropumps are important components of advanced microfluidic systems. Here, polyimide (PI) as an advantageous structural material for flexible micropumps was focused on. This is because PI has many advantageous properties such as high thermal stability and superior mechanical strength. However, the difficulty in realizing an all-PI ...

Sensors and Actuators A 127 (2006) 94�103 CFD modeling of an ion-drag micropump J. Darabi, C an electrohydrodynamic (EHD) micropump. The micropump consists of an array of interdigitated electrodes along the top and bottom of the micropump channel. The focus of the simulations was to study the effects of electrode ...

The various possible systems of a-c magnetohydrodynamic power generation using electrodes or inductive coupling with stationary or alternating magnetic fields are examined and compared with the d-c case. It is shown that with gas temperatures below 3000 deg K and an alternating magnetic field the cost of coil driving equipment is likely to be ...

A dextran-ferrite magnetic fluid was successfully tested as magnetic resonance imaging (MRI) contrast agent. The same magnetic fluid was then combined with Melphalan, a chemotherapeutic drug, and used for magnetohydrodynamic thermochemotherapy of different tumors. The placement of the tumors in an AC magnetic field led to hyperthermia at 46 �C for 30 ...

The basic physical principles of magnetohydrodynamic generation are described, and the electrodynamics and thermodynamics are discussed. The interaction is controlled by the plasma conductivity, which is low, and methods of increasing it are mentioned. The quasi-one-dimensional flow equations are presented, and methods of solution are outlined. The practical ...

_final stable_final 1 1 10 20 R R R= ~ Nanostructured Nanofibers High Voltage Supplier Micropump Collector Shielded Heating Unit Guided Chamber with Heating Controller R High Voltage Supplier Micropump Collector

, micropumps and microvalves. These microstruc- tures (e.g. microfluidic) are divided in two different, and by operating them in different phases, a peristaltic micropump could be created � this is very useful in cases for electronic fertility control to micropumps for nanolitre drug delivery become foreseeable. The basic

Jan 22, 2011 ... dc.subject.other, peristaltics micropump valves flow metering eutectic bonding ... dc.title, Micropump Technology and Applications, en_US ...

Jan 22, 2011 ... Title: MicroPump Technology for Spacecraft and Commercial Applications. Authors: Hartly, F. T.. Issue Date: 21-Oct-1997 ...

through microchannels by a micropump. Microchannel heat exchangers have been ... and micropump technologies. This paper presents background on the need for ...

... 11 4.1.2 Water-Powered, Osmotic Micropump.....17 4.1 ... Figure 28: SEM micrograph of the micropump ...

Specifically, micropump and microvalve components for such a system will be ... The micropump and microvalve devices will be engineered for integration with ...

the impact of this factor and that of the suction-purriping micropump ..... attaching a micropump capable of operating in both positive and negative (air in ...

... 15 1.4 The passive valve micropump . . . . . ... 21 1.4.3 Conclusions from the micropump development . . . . . ...

Micropump Technology and Applications. Frank T. Hartley. Jet Propulsion Laboratory, California Institute of Technology. 4800 Oak Grove Drive, Pasadena CA 9 ...

Jan 22, 2011 ... Title: Micropump Technology and Applications. Authors: Hartley, F. Issue Date: 29-Oct-1999. Citation: Design, Characterization and Packaging ...

The proposed micropump-feed Direct Methanol Fuel Cell (DMFC) will provide a commercial product for use on multiple NASA manned missions, micro satellites, ...

... The �Actuator�: Integrated Gas Micropump � Concluding Remarks, Future Trends Page 4. ... 22 � Goal: Develop a miniature micropump for the µGC: ...

micropump; it provides many advantages over passive thermal control concepts ... microchannel configurations, working uids, and micropump technologies. ...

... a 2r Page 22. 2mm Micropump One Dime 3D Valveless Micropump � Truly 3D cavity structure to optimize the design � High ...

�m) was not demonstrated as a good pumping element in microfluidic systems. A valveless micropump was observed with the developed micropump in spite a bulky and external actuation device was required

... Fuel ejection & droplet formation � Micropump operation (especially, the valving) ... L Performance Modeling � TDA's Quasi 1-D Micropump Model ...

Also, the micro-pump itself might function as a valve. 3. COMPONENTS. FOR FLUID. HANDLING ... micropump, and a microvalve specially designed for integration ...

lasers, miniature gas chromatographs and high- frequency fluidic control systems. Micropumps are used involve fluid flows, but the present review will focus on the ones that do. Microducts, micropumps

... 1.1. Electrostatically actuated micropump with check valves.....3 ... Fig. 1.1 Electrostatically actuated micropump with check valves. ...

... The use of piezoelectric stacks to actuate a micropump has previously been demonstrated by Shoji et al [3]. In this implementation, micropumps ...

Nov 24, 2008 ... A highly efficient, robust, long-life micropump will have applications in the next generation of small space craft thermal control systems. ...

Sep 16, 2008 ... A highly efficient, robust, long-life micropump will have applications in the next generation of small space craft thermal control systems. ...

... The dye circulation system consisted of a micropump, a mesh filter, a dye reservoir, ... For 1 Hz UV dye laser operation, the micropump, having 40 ...

... Scheme 2 was developed to test a micropump using the bearing mechanism (27). The micropump device was also used ...

... (Author). Descriptors : (*MAGNETOHYDRODYNAMICS, MATHEMATICAL MODELS), (*NUCLEAR EXPLOSIONS, MAGNETOHYDRODYNAMICS ...