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 ...
DOE Information Bridge
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 specimens. micropump, using the Lorentz force as ...
... Abstract : The theory of magnetohydrodynamic power generators is presented. ... sectional area flows; end losses; AC generation; cycle efficiencies ...
DTIC Science & Technology
... AC MHD power generation was ... FEASIBILITY STUDIES, POWER, GENERATORS ... NOZZLES, MAGNETOHYDRODYNAMIC GENERATORS ...
/s)U O ACEO (AC electroosmosis) #12;AC electroosmotic pump Advantages � ~1V (less than 5V) DCEO pump ACEO
E-print Network
A magnetohydrodynamic pump for pumping a fluid. The pump includes a microfluidic channel for channeling the fluid, a MHD electrode/magnet system operatively connected to the microfluidic channel, and a system for promoting flow of the fluid in one direction in the microfluidic channel. The pump has uses in the ...
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 ...
National Technical Information Service (NTIS)
and sensitivity can be increased significantly. This paper discusses how AC electro-osmosis (ACEO) is applied). AC electroosmosis (ACEO) is a newly developed microfluidic technology, and this paper presents how. AC ELECTROOSMOSIS MECHANISM AC electroosmosis is based on the fundamental principle ...
In microfluidic devices, it is necessary to propel samples and reagents from one part of the device to another, stir fluids, and detect the presence of chemical and biological targets. Given the small size of these devices, the above tasks are far from trivial. Magnetohydrodynamics (MHD) offers an elegant means to control fluid flow in microdevices without ...
PubMed
PubMed Central
mixer uses ac electric field-induced dielectro- phoretic (DEP) forces.17 DEP forces fold and stretch
A microfabricated instrument for detecting and identifying cells and other particles based on alternating current (AC) impedance measurements. The microfabricated AC impedance sensor includes two critical elements: 1) a microfluidic chip, preferably of glass substrates, having at least one microchannel therein and with electrodes ...
to be applicable to bio-particles collection. Keywords AC electroosmosis � Microfluidic � Particle trapping � micrometers. On the other hand, AC electroosmosis (ACEO) generates fluid motion to convey particles, hence and preliminary tests were performed. 2 Particle trapping by AC electroosmosis ...
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 ...
Energy Citations Database
An understanding of all fluid dynamic time scales is needed to fully understand and hence exploit the capabilities of fluid flow in microfluidic systems. We propose the use of harmonically oscillating microfluidics as an analytical tool for the deduction of these time scales. Furthermore, we suggest the use of system-level equivalent circuit theory as an ...
NASA Astrophysics Data System (ADS)
We introduce droplet jumping by resonant AC electrowetting (DJ-RACE) to transport droplets to vertical direction, envisioning three-dimensional digital microfluidics. Inphase oscillatory actuation by resonant AC electrowetting allows droplets to store sufficient energy for jumping on their stretched surfaces by conventional ...
Micromixing is a crucial process within microfluidic systems such as micro total analysis systems (?TAS). A state-of-art review on microstructured mixing devices and their mixing phenomena is given. The review first presents an overview of the characteristics of fluidic behavior at the microscale and their implications in microfluidic mixing processes. ...
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 ...
. 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. 84�89, 2000. [24] P. H. Paul, D. W. Arnold, and D. J
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 ...
The AC electrokinetic movement of fluids has its origin in two different physical mechanisms: AC electroosmosis, the interaction of the Electrical Double Layer induced on microelectrodes by an applied potential and the generated electric field; and electrothermal Electro-hydrodynamics, the interaction of an electric field with gradients in polarisability ...
This paper details the development of an integrated AC electro-osmotic (ACEO) microfluidic pump for dilute electrolytes consisting of a long serpentine microchannel lined with three dimensional (3D) stepped electrode arrays. Using low AC voltage (1 V rms, 1 kHz), power (5 mW) and current (4.5 mA) in water, the pump is capable of ...
