Rapid mixing between ferro-nanofluid and water in a semi-active Y-type micromixer

Tsai, Tsung-Han; Liou, Dar-Sun; Kuo, Long-Sheng; Chen, Ping‐Hei

doi:10.1016/j.sna.2009.05.004

Cited by 93 publications

(34 citation statements)

References 11 publications

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“…This can lead to long waiting times and poor completion of those reactions. For this reason, especially in the realm of microfluidics, there has been an increasing interest in devising ways to accelerate these processes and it turns out that one of the most promising avenues to alleviate this shortcoming is with active ferromagnetic particles [13,35]. A colloid of ferromagnetic particles is called a ferrofluid which, as mentioned in the Introduction, can be described with the micropolar Navier Stokes equations.…”

Section: Convergence Tests For the First Order Schemementioning

confidence: 99%

Convergence Analysis of Fractional Time-Stepping Techniques for Incompressible Fluids with Microstructure

Salgado

2014

J Sci Comput

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We present and analyze fully discrete fractional time stepping techniques for the solution of the micropolar Navier Stokes equations, which is a system of equations that describes the evolution of an incompressible fluid whose material particles possess both translational and rotational degrees of freedom. The proposed schemes uncouple the computation of the linear and angular velocity and the pressure. We develop a first order scheme which is unconditionally stable and delivers optimal convergence rates, and an almost unconditionally stable second order scheme.

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Section: Convergence Tests For the First Order Schemementioning

confidence: 99%

Convergence Analysis of Fractional Time-Stepping Techniques for Incompressible Fluids with Microstructure

Salgado

2014

J Sci Comput

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“…4,5 Other applications include separation of diamagnetic particles, 6,7 rotating seals, 8 loudspeakers, 9 and microlens arrays. 10,11 Usually, permanent magnets [12][13][14] or electromagnets 15,16 are placed adjacent to LOC devices to produce a magnetic field gradient. Alternatively, micro magnets are directly fabricated and embedded in LOC chips by micro fabrication techniques (e.g., sputter deposition and soft-lithography) to produce magnetic (e.g., Ni) thin films with the required geometry.…”

Section: Introductionmentioning

confidence: 99%

Spreading of a ferrofluid core in three-stream micromixer channels

et al. 2015

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Spreading of a water based ferrofluid core, cladded by a diamagnetic fluid, in threestream micromixer channels was studied. This spreading, induced by an external magnetic field, is known as magnetofluidic spreading (MFS). MFS is useful for various novel applications where control of fluid-fluid interface is desired, such as micromixers or micro-chemical reactors. However, fundamental aspects of MFS are still unclear, and a model without correction factors is lacking. Hence, in this work, both experimental and numerical analyses were undertaken to study MFS. We show that MFS increased for higher applied magnetic fields, slower flow speed of both fluids, smaller flow rate of ferrofluid relative to cladding, and higher initial magnetic particle concentration. Spreading, mainly due to connective diffusion, was observed mostly near the channel walls. Our multi-physics model, which combines magnetic and fluidic analyses, showed, for the first time, excellent agreement between theory and experiment. These results can be useful for lab-on-a-chip devices. C 2015 AIP Publishing LLC. [http://dx.

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“…In such devices, the mixing of small microorganisms with fluids is often insufficient [1]. Traditionally, the active mixers are often used to enhance the mixing, while they are rather expensive and energy-intensive in fabrication.…”

Section: Introductionmentioning

confidence: 99%

Lie Group Analysis of a Nanofluid Bioconvection Flow Past a Vertical Flat Surface With an Outer Power-Law Stream

2015

Journal of Heat Transfer

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In this paper, an analysis on a bioconvection flow of a nanofluid past a vertical flat plate in the presence of an out power-law stream is made. The passively controlled nanofluid model is used to approximate this flow problem, which is believed to be physically more realistic than previously commonly used actively controlled nanofluid models. The Lie group transformation method is introduced to seek similarity solutions of such nanobioconvection flows for the first time. The reduced governing equations are then solved numerically with a finite difference technique. Besides, the influences of various parameters such as the Grashof number, the Prandtl number, the bioconvection Rayleigh number, the Lewis number, the bioconvection P eclet number, and the Schimdt number on the distributions of the density of motile micro-organisms profiles, as well as the local skin friction coefficient, the local Nusselt number, the local wall mass flux, and the local density of the motile micro-organisms are analyzed and discussed.

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Rapid mixing between ferro-nanofluid and water in a semi-active Y-type micromixer

Cited by 93 publications

References 11 publications

Convergence Analysis of Fractional Time-Stepping Techniques for Incompressible Fluids with Microstructure

Convergence Analysis of Fractional Time-Stepping Techniques for Incompressible Fluids with Microstructure

Spreading of a ferrofluid core in three-stream micromixer channels

Lie Group Analysis of a Nanofluid Bioconvection Flow Past a Vertical Flat Surface With an Outer Power-Law Stream

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