Convective heat transfer enhancement in a pitted microchannel by stimulation of magnetic nanoparticles

Karami, Ehsan; Rahimi, Masoud; Azimi, Neda

doi:10.1016/j.cep.2018.02.023

Cited by 26 publications

(6 citation statements)

References 35 publications

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“…A ferrofluid is defined as a highly stable colloidal suspension of MNP in a liquid carrier (aqueous or organic) [1][2][3][4]. Owing to the great potential of MNP for a wide range of engineering applications, ferrofluids are considered as promising medium for the next generation of mechanical and engineering systems [5]. A magnetite-based ferrofluid is a type of functional fluid whose flow can be controlled by a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Mixing and Mass Transfer in a Micromixer by Stimulation of Magnetic Nanoparticles in a Magnetic Field

2021

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A numerical study on the hydrodynamics of ferrofluid flow and mass transfer characteristics in a Y‐type micromixer is performed. Computational fluid dynamics (CFD) simulation is accomplished to survey the behavior of ferrofluid flow subject to an external magnetic field and to specify its effect on the mass transfer between two immiscible liquid phases. The geometric reconstruction scheme (Geo‐Reconstruct) based on piecewise linear interpolation is applied to reconstruct the two‐phase interface. The results of CFD modeling are validated by experimental data, and good agreements are achieved, with a maximum relative error for the extraction efficiency of about 7.52 %. This research work shows that ferrofluid stimulation by a magnetic field can be an efficient mixing factor in microdevices.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of Mixing and Mass Transfer in a Micromixer by Stimulation of Magnetic Nanoparticles in a Magnetic Field

2021

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“…According to the literature, [ 4,45–47 ] the presence of nanoparticles in the fluid flow causes an increase in the pressure drop due to an increase in the fluid viscosity. Indeed, adding nanoparticles to the carrier fluid has a direct effect on the pressure drop and thus the needed energy amount for mixing.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3] So, micro-technology is currently applied as a fine area for rapid development in numerous applications due to great mass transfer and efficiency of mixing, high product selectivity, safety proficiency, and lower energy usage. [4][5][6][7][8] Indeed, microreactors perform continuous chemical reactions in a micro-scale channel and provide a highly specific surface. Moreover, microreactors are normally three-dimensional configurations with an inner diameter of less than a millimetre, and reaction capacities in the nanolitre to microlitre limits.…”

Section: Introductionmentioning

confidence: 99%

Investigation of mixing performance in a semi‐active T‐micromixer actuated by magnetic nanoparticles: Characterization via Villermaux–Dushman reaction

et al. 2022

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A semi‐active T‐type micromixer is designed to intensify micromixing by actuating magnetic nanoparticles (MNPs). Five permanent magnets in a zig‐zag arrangement are located next to the mixing channel of the micromixer to apply the magnetic field to the fluid flow. Micromixing performance is considered in terms of the segregation index (XS) by the Villermaux/Dushman reaction test. The effects of magnetic flux intensity (B = 380–500 mT), the concentration of MNPs (φ = 0.002–0.01 [w/v]), and flow rate ratios on XS and pressure drop are investigated. By increasing MNPs concentration from φ = 0.002–0.008 (w/v), XS decreased and the rise in φ up to 0.008 (w/v) has not been significant on XS. Maximum mixing efficiency (i.e., minimum XS = 0.0088) is achieved for B = 500 mT and φ = 0.01 (w/v). By applying the magnetic field, the mixing performance increased due to the motion of MNPs, but its negative effect is an increase in the pressure drop along the micromixer reactor. Generally, with the formation of MNPs barriers inside the mixing channel, the main fluid flows through these layers and creates the sinusoidal flow paths compared to no magnetic field conditions, and thus, a superior mixing efficiency could be attained.

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“…Shape memory materials are known to be stimuli‐sensitive smart objects which can regain their programmed shape under specific triggering conditions. [ 1–4 ] These materials can be made of either metals or polymers, based on the required characteristics, whose shape memory effects (SME) may be activated by light, magnetic/electric fields, pH/temperature change, etc. [ 3 ] One of the most important categories of shape memory polymers (SMPs) is undoubtedly thermo‐sensitive SMPs that have been subjected to many academic/industrial investigations.…”

Section: Introductionmentioning

confidence: 99%

Improved thermostimulative shape memory behavior of HDPE/PET immiscible blend‐based polymer nanocomposite using amphiphilic Janus nanoparticles

2022

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In the study, the impact of homogeneously modified (HM) and Janus silica nanoparticles on the thermostimulative shape memory effect of high-density polyethylene/poly(ethylene terephthalate) blend-based polymer nanocomposites (BPN) is investigated. It is shown that the physical/mechanical characteristics of the polymer/polymer interface have a determinative role in defining the shape memory effect of the system. Accordingly, the effect of each nanoparticle type on this region is precisely evaluated and interpreted. The Janus nanoparticles are synthesized via a two-step desymmetrization process in Pickering emulsion, using different polar/apolar silane agents, while a single-step modification procedure is used to perform the homogenous modification. The designing stages of a comprehensive analytical model are discussed which is used to evaluate the corporation level of the HM and Janus nanoparticles in the recovery mechanism of the BPN samples. The results of different characterizing tests (e.g., tensile, recovery, dynamic mechanical thermal analysis, rheology, etc.) are proposed to demonstrate the impact of different types of nanoparticles on the polymer/polymer interface and shape memory effect (SME) in each sample. It is proved that the BPN samples containing Janus nanoparticles have the strongest SME, in both stretching and bending modes, even better than similar systems containing small molecule compatibilizers.

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Convective heat transfer enhancement in a pitted microchannel by stimulation of magnetic nanoparticles

Cited by 26 publications

References 35 publications

Numerical Study of Mixing and Mass Transfer in a Micromixer by Stimulation of Magnetic Nanoparticles in a Magnetic Field

Numerical Study of Mixing and Mass Transfer in a Micromixer by Stimulation of Magnetic Nanoparticles in a Magnetic Field

Investigation of mixing performance in a semi‐active T‐micromixer actuated by magnetic nanoparticles: Characterization via Villermaux–Dushman reaction

Improved thermostimulative shape memory behavior of HDPE/PET immiscible blend‐based polymer nanocomposite using amphiphilic Janus nanoparticles

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