Microfluidic analysis of CO2 bubble dynamics using thermal lattice-Boltzmann method

Fei, K.; Chen, W. H.; Hong, Che–Wun

doi:10.1007/s10404-007-0232-x

Cited by 25 publications

(6 citation statements)

References 19 publications

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“…Values of contact angles used in simulation match closely water/PEO and water/polycarbonate static contact angles verified through numerical calibration. Investigation of wall wettability on the two-phase flow using the LBM modeling method was also previously conducted by Fei et al 23 Properties of species, water and air, as well as their interactions with solids were adopted from Huang et al 21 In all cases, when a liquid film was initialized between the bubble and channel wall, Eq. 6 was used based on a relation provide by Aussillous and Qu er e. …”

Section: Methodsmentioning

confidence: 99%

Effect of PEO coating on bubble behavior within a polycarbonate microchannel array: A model for hemodialysis

et al. 2015

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Obstruction of fluid flow by stationary bubbles in a microchannel hemodialyzer decreases filtration performance and increases damage to blood cells through flow maldistribution. A polyethylene oxide (PEO)-polybutadiene (PB)-polyethylene oxide surface modification, previously shown to reduce protein fouling and water/air contact angle in polycarbonate microchannel hemodialyzers, can improve microchannel wettability and may reduce bubble stagnation by lessening the resistive forces that compete with fluid flow. In this study, the effect of the PEO-PB-PEO coating on bubble retention in a microchannel array was investigated. Polycarbonate microchannel surfaces were coated with PEO-PB-PEO triblock polymer via radiolytic grafting. Channel obstruction was measured for coated and uncoated microchannels after injecting a short stream of air bubbles into the device under average nominal water velocities of 0.9 to 7.2 cm/s in the channels. The presence of the PEO coating reduced obstruction of microchannels by stationary bubbles within the range of 1.8 to 3.6 cm/s, average nominal velocity. Numerical simulations based on the lattice Boltzmann method indicate that beneficial effects may be due to the maintenance of a lubricating, thin liquid film around the bubble. The determined effective range of the PEO coating for bubble management serves as an important design constraint. These findings serve to validate the multiutility of the PEO-PB-PEO coating (bubble lubrication, biocompatibility, and therapeutic loading). © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 941-948, 2016.

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Section: Methodsmentioning

confidence: 99%

Effect of PEO coating on bubble behavior within a polycarbonate microchannel array: A model for hemodialysis

et al. 2015

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“…Fei et al (2006) and Fei and Hong (2007) investigated the bubble transport in a micronsized channel by a 2D LB method. In a follow-up paper, they studied heat transfer including Marangoni effects due to a temperature dependent surface tension and found that bubbles moved more rapidly in a divergent microchannel than in a straight or convergent channel (Fei et al 2008). …”

Section: Marangoni Effects and Surfactantsmentioning

confidence: 97%

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

Wörner

2012

Microfluid Nanofluid

370

197

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This article presents a comprehensive review of numerical methods and models for interface resolving simulations of multiphase flows in microfluidics and micro process engineering. The focus of the paper is on continuum methods where it covers the three common approaches in the sharp interface limit, namely the volumeof-fluid method with interface reconstruction, the level set method and the front tracking method, as well as methods with finite interface thickness such as color-function based methods and the phase-field method. Variants of the mesoscopic lattice Boltzmann method for two-fluid flows are also discussed, as well as various hybrid approaches. The mathematical foundation of each method is given and its specific advantages and limitations are highlighted. For continuum methods, the coupling of the interface evolution equation with the single-field Navier-Stokes equations and related issues are discussed. Methods and models for surface tension forces, contact lines, heat and mass transfer and phase change are presented. In the second part of this article applications of the methods in microfluidics and micro process engineering are reviewed, including flow hydrodynamics (separated and segmented flow, bubble and drop formation, breakup and coalescence), heat and mass transfer (with and without chemical reactions), mixing and dispersion, Marangoni flows and surfactants, and boiling.

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“…Oscillation of two-phase flow in microchannels for cooling applications was studied and a control method by using an adjustable inlet orifice was presented [26]. The studies of bubble dynamics in the microfluidic circumstances with numerical methods were also suggested [27,28]. Some other properties of the gas-liquid two-phase flow in microchannels were studied under different circumstances [29,30].…”

Section: Introductionmentioning

confidence: 98%

Dynamic Characterization of a Valveless Micropump Considering Entrapped Gas Bubbles

Li¹,

Liu

Jiang

2013

Journal of Heat Transfer

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Unexpected gas bubbles in microfluidic devices always bring the problems of clogging, performance deterioration, and even device functional failure. For this reason, the aim of this paper is to study the characterization variation of a valveless micropump under different existence conditions of gas bubbles based on a theoretical modeling, numerical simulation, and experiment. In the theoretical model, we couple the vibration of piezoelectric diaphragm, the pressure drop of the nozzleldiffuser and the compressibility of working liquid when gas bubbles are entrapped. To validate the theoretical model, numerical simulation and experimental studies are carried out to investigate the variation of the pump chamber pressure influenced by the gas bubbles. Based on the numerical simulation and the experimental data, the outlet flow rates of the micropump with different size of trapped gas bubbles are calculated and compared, which suggests the influence of the gas bubbles on the dynamic characterization of the valveless micropump.

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Microfluidic analysis of CO2 bubble dynamics using thermal lattice-Boltzmann method

Cited by 25 publications

References 19 publications

Effect of PEO coating on bubble behavior within a polycarbonate microchannel array: A model for hemodialysis

Effect of PEO coating on bubble behavior within a polycarbonate microchannel array: A model for hemodialysis

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

Dynamic Characterization of a Valveless Micropump Considering Entrapped Gas Bubbles

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