MEMS Heat Exchangers

Mathew, Bobby; Weiss, Leland

doi:10.1002/9781119083887.ch3

Cited by 12 publications

(3 citation statements)

References 58 publications

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“…Microfluidic devices are those devices with flow passages smaller than 1000 μm, and this brings about certain advantages including a reduced need for sample and reagents, reduced power consumption, portability, and small footprint [ 1 , 2 ]. Additionally, microfluidic devices allow for enabling phenomena that are often not practically realizable in any device of conventional length scales [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Dielectrophoretic Microfluidic Device for Separating Microparticles Based on Size with Sub-Micron Resolution

et al. 2020

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This article details the mathematical model of a microfluidic device aimed at separating any binary heterogeneous sample of microparticles into two homogeneous samples based on size with sub-micron resolution. The device consists of two sections, where the upstream section is dedicated to focusing of microparticles, while the downstream section is dedicated to separation of the focused stream of microparticles into two samples based on size. Each section has multiple planar electrodes of finite size protruding into the microchannel from the top and bottom of each sidewall; each top electrode aligns with a bottom electrode and they form a pair leading to multiple pairs of electrodes on each side. The focusing section subjects all microparticles to repulsive dielectrophoretic force, from each set of the electrodes, to focus them next to one of the sidewalls. This separation section pushes the big microparticles toward the interior, away from the wall, of the microchannel using repulsive dielectrophoretic force, while the small microparticles move unaffected to achieve the desired degree of separation. The operating frequency of the set of electrodes in the separation section is maintained equal to the cross-over frequency of the small microparticles. The working of the device is demonstrated by separating a heterogeneous mixture consisting of polystyrene microparticles of different size (radii of 2 and 2.25 μm) into two homogeneous samples. The mathematical model is used for parametric study, and the performance is quantified in terms of separation efficiency and separation purity; the parameters considered include applied electric voltages, electrode dimensions, outlet widths, number of electrodes, and volumetric flowrate. The separation efficiencies and separation purities for both microparticles are 100% for low volumetric flow rates, a large number of electrode pairs, large electrode dimensions, and high differences between voltages in both sections.

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Section: Introductionmentioning

confidence: 99%

Dielectrophoretic Microfluidic Device for Separating Microparticles Based on Size with Sub-Micron Resolution

et al. 2020

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“…Microfluidic devices are those that employ flow passages with small hydraulic diameters ( < 1 mm) (Mathew & Weiss, 2015). There are several advantages in employing in microscale flow passages including reduced requirement for sample and reagents, small footprint and portability, and minimal power consumption (Mark et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Magnetophoretic microdevice for size-based separation: model-based study

Alnaimat

Mathew

2020

Engineering Applications of Computational Fluid Mechanics

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This article proposes a novel a magnetophoretic microfluidic device for separation of magnetic microparticles based on size and subsequently carries out simulation-based parametric analysis of the same. The microfluidic device is constructed with two inlets as well as two outlets and employs a soft magnetic element subjected to a uniform magnetic field to create the desired spatially varying magnetic field inside the microchannel. The first inlet introduces the sample while the second inlet is for introducing sheath flow to focus the microparticles close to the microchannel's bottom surface prior to being deflected by magnetophoresis to the appropriate outlets. Parameters such as location of outlets, microchannel height, fluid velocity, and ratio of inlet and of outlet flow rates influence the movement of microparticles inside the microchannel and the associated performance metrics. Parametric study, carried out using 1 and 10 µm magnetic microparticle suspended in water, revels that the best performance metrics occur when flow rate ratios are maintained as low as possible. In addition, the performance metrics are examined for different designs to determine the optimal value of the location of the outlet associated with large microparticles.

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“…Microfluidic devices employ channels with hydraulic diameters smaller than 1 mm and this brings about certain advantages such as low sample and reagent requirement, small footprint, portability, and low power consumption [1,2]. Microfluidic devices are used for several applications including type- and size-based separation of microparticles [3].…”

Section: Introductionmentioning

confidence: 99%

Nozzle-Shaped Electrode Configuration for Dielectrophoretic 3D-Focusing of Microparticles

2019

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An experimentally validated mathematical model of a microfluidic device with nozzle-shaped electrode configuration for realizing dielectrophoresis based 3D-focusing is presented in the article. Two right-triangle shaped electrodes on the top and bottom surfaces make up the nozzle-shaped electrode configuration. The mathematical model consists of equations describing the motion of microparticles as well as profiles of electric potential, electric field, and fluid flow inside the microchannel. The influence of forces associated with inertia, gravity, drag, virtual mass, dielectrophoresis, and buoyancy are taken into account in the model. The performance of the microfluidic device is quantified in terms of horizontal and vertical focusing parameters. The influence of operating parameters, such as applied electric potential and volumetric flow rate, as well as geometric parameters, such as electrode dimensions and microchannel dimensions, are analyzed using the model. The performance of the microfluidic device enhances with an increase in applied electric potential and reduction in volumetric flow rate. Additionally, the performance of the microfluidic device improves with reduction in microchannel height and increase in microparticle radius while degrading with increase in reduction in electrode length and width. The model is of great benefit as it allows for generating working designs of the proposed microfluidic device with the desired performance metrics.

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MEMS Heat Exchangers

Cited by 12 publications

References 58 publications

Dielectrophoretic Microfluidic Device for Separating Microparticles Based on Size with Sub-Micron Resolution

Dielectrophoretic Microfluidic Device for Separating Microparticles Based on Size with Sub-Micron Resolution

Magnetophoretic microdevice for size-based separation: model-based study

Nozzle-Shaped Electrode Configuration for Dielectrophoretic 3D-Focusing of Microparticles

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