Effect of high frequency ultrasound on micromixing efficiency in microchannels

Faryadi, Mahboubeh; Rahimi, Masoud; Safari, Sahar; Moradi, Negin

doi:10.1016/j.cep.2014.01.001

Cited by 36 publications

(22 citation statements)

References 41 publications

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“…It is observed the highest mixing efficiency is attainable at the lowest Reynolds number (Re = 5). Second, the mixing index of T‐micromixer was found better than that of Y‐micromixer, which agrees well with the findings in Sarkar et al and Faryadi et al . Third, it is obvious that the mixing phenomena of both micromixers enhance with the decrease of Reynolds number, exhibiting similar characteristics with the previous studies .…”

Section: Resultssupporting

confidence: 90%

“…To demonstrate the proposed method, the mixing performances of fabricated micromixers with two different designs, namely T‐ and Y‐micromixers, were evaluated as shown in Figure . These two types of micromixers are often employed for benchmarking purposes . The total mixing length of the micromixers is 40 mm.…”

Section: Methodsmentioning

confidence: 99%

“…These two types of micromixers are often employed for benchmarking purposes. 6,7,9,14,[34][35][36] The total mixing length of the micromixers is 40 mm. The procedure to fabricate both micromixers is illustrated in Figure 7.…”

Section: Microfluidic Devices Fabricationmentioning

confidence: 99%

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Method for determining mixing index in microfluidics by RGB color model

Mahmud

Tamrin

2020

Asia-Pacific J Chem Eng

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Microfluidic mixing is a key process in miniaturized analysis system. Achieving adequate mixing performance is considerably difficult in microfluidic micromixer, as the flow is always associated with unfavorable laminar flow and dominated by molecular diffusion. The mixing performance of these micromixers are generally characterized as a function of mixing index based on dispersion (homogeneity) information, leading to either an overestimated or underestimated mixing index. This paper presents a new method for determining the mixing index of micromixers based on RGB color model by decoding mixing images to their respective red, green, and blue pixel intensities. Several digital composite images were used to perform initial benchmarking, and the proposed method accurately quantified the mixing index significantly better than previously adopted methods. The practicality of the method was further demonstrated by characterizing mixing of well‐known micromixers, namely T‐ and Y‐ micromixers, at varying Reynolds numbers of 5 ≤ Re ≤ 100. The results show that the mixing index decreases with the increase in Reynolds number, whereas the mixing index of the T‐micromixer was superior to that of Y‐micromixer, both agreeing well with the literature. The mixing index of these micromixers at varying Reynolds numbers of 5 ≤ Re ≤ 100 calculated using other methods were also compared and discussed. The proposed method is foreseen handy and robust in characterizing mixing in real time for gradient mixing in networked microchannels and multivortex mixing for the manipulation of fluids, particles, and biological substances.

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Section: Resultssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

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Method for determining mixing index in microfluidics by RGB color model

Mahmud

Tamrin

2020

Asia-Pacific J Chem Eng

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“…Considering this, mixing is a very important issue in MCRs design [8]. In micromixers, fluid deformation through convection is generated by variations in the geometry of a channel, e.g., channel confluence, bend, and twist can influence the mixing performance [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

LASP and Villermaux/Dushman protocols for mixing performance in microchannels: Effect of geometry on micromixing characterization and size reduction

Rahimi

Valeh-e-Sheyda

Parsamoghadam

et al. 2014

Chemical Engineering and Processing: Process Intensification

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“…The most interesting ones include: tubular reactors (Bałdyga and Henczka, 1997), static mixers (Fang and Lee, 2001;, jets (Baldyga et al, 1994), centrifugal pumps (Bolzern and Bourne, 1985), membrane reactors (Baccar et al, 2009;Jia et al, 2006), sonoreactors (Faryadi et al, 2014;Lee et al, 2014;Monnier et al, 1999;Monnier et al, 2000;Parvizian et al, 2011;Parvizian et al, 2012), reactors with torus shape (Nouri et al, 2008), reactors for polymerisation (Kunowa et al, 2007). Diazo-coupling reactions, ester hydrolysis reactions, and Villermaux-Dushman reaction were applied in these investigations.…”

Section: Other Systemsmentioning

confidence: 99%

Test Reactions to Study Efficiency of

Jasińska¹

2015

Chemical and Process Engineering

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Effects of mixing on the course of fast chemical reactions are relatively well understood, especially in homogeneous systems. This enables to design and operate chemical reactors with the goal to achieve a high yield of a desired product and use systems of complex reactions as a chemical probe (chemical test reactions) to identify progress of mixing and quality of mixture. Recently, a number of studies have focused on the application of chemical test reactions to identify energy efficiency of mixing, being a convenient way of comparing mixers and reactors in terms of their mixing efficiency. This review offers a presentation of chemical test reactions available in the literature and methods of applications of test reactions to identify the energy efficiency of mixing. Also methods to assess the extent of micromixing by measuring product distribution or segregation index, and to determine the time constant for mixing are presented for single phase homogeneous systems and two-phase liquid-liquid systems.

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Effect of high frequency ultrasound on micromixing efficiency in microchannels

Cited by 36 publications

References 41 publications

Method for determining mixing index in microfluidics by RGB color model

Method for determining mixing index in microfluidics by RGB color model

LASP and Villermaux/Dushman protocols for mixing performance in microchannels: Effect of geometry on micromixing characterization and size reduction

Test Reactions to Study Efficiency of

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