Effect of boundary conditions on pollutant dispersion in 2‐dimensional rivers

Wang, S. T.; McMillan, Alan F.; Chen, B. H.

doi:10.1002/cjce.5450560216

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…At first, the CFD model is corroborated with the literature data of Wang and Gupta et al for air‐water two‐phase flow systems in co‐flow microchannels. For validation with Wang, a tapered co‐flow configuration is simulated. The model predictions of bubble length are found to be in excellent agreement with literature data, as shown in Figure a.…”

Section: Resultssupporting

confidence: 75%

“…(a) Taylor bubble length comparison for different injection lengths (

L_{in}

) for

η_{w}

= 1.003

\times 10^{- 3}

kg/m . s,

Q_{G} = 0.47 μ

L/s, and

Q_{L} = 2.01 μ

L/s with the results of Wang, and (b) comparison of Taylor bubble shape with Gupta et al for air‐water system with

U_{G} = 0.5

m/s,

U_{L} = 0.5

m/s.…”

Section: Numerical Modelsupporting

confidence: 54%

“…where˙ is the applied shear rate, Á 0 represents the dynamic viscosity corresponding to the zero shear rate (˙ → 0), and Á ∞ is the viscosity at infinite shear rate (˙ → ∞), which was assigned as [24] and (b) comparison of Taylor bubble shape with Gupta et al [23] for air-water system with U G = 0.5 m/s, U L = 0.5 m/s. the liquid viscosity.…”

Section: Constitutive Equation Of Continuous Phasementioning

confidence: 99%

“…Gupta et al critically analyzed Taylor bubble flow in a co‐flow device, and provided guidelines to capture thin liquid film around the bubble by imposing refined mesh in the vicinity of wall. Wang also applied the VOF method to understand Taylor bubble flow for an air‐water system in a tapered co‐flow configuration, where the effects of inlet velocities and capillary injection length on Taylor bubble length and formation frequencies were described.…”

Section: Introductionmentioning

confidence: 99%

“…Gupta et al [23] critically analyzed Taylor bubble flow in a co-flow device, and provided guidelines to capture thin liquid film around the bubble by imposing refined mesh in the vicinity of wall. Wang [24] also applied the VOF method to understand Taylor bubble flow for an air-water system in a tapered co-flow configuration, where the effects of inlet velocities and capillary injection length on Taylor bubble length and formation frequencies were described. From the literature, it is apparent that most of the efforts are devoted in understanding and modelling of the Taylor flow hydrodynamics and its characteristics associated with Newtonian liquids at the microscale.…”

Section: Introductionmentioning

confidence: 99%

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CFD study on Taylor bubble characteristics in Carreau‐Yasuda shear thinning liquids

Sontti

Atta

2018

Can J Chem Eng

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In the present study, Taylor bubble formation in two‐phase gas‐non‐Newtonian Carreau liquid flowing through a confined co‐flow microchannel is investigated. Systematic analyses are carried out to explore the influences of rheological properties, inlet velocities, and surface tension on Taylor bubble length, shape, velocity, and liquid film thickness. Aqueous solutions of carboxymethyl cellulose (CMC) with different mass concentrations are considered as the non‐Newtonian liquids to understand the fundamentals of flow behaviour. With increasing solution viscosity and liquid phase inlet velocity, Taylor bubble formation frequency and velocity increased; however, the bubble length was found to decrease. Velocity profiles inside the Taylor bubble and liquid slug were analyzed, and distinct velocity distributions were found for different CMC concentrations. Flow regime maps are developed based on gas and liquid velocities for Carreau liquids in the co‐flow microchannel. This study essentially provides useful guidelines in designing a non‐Newtonian microfluidic system for precise control and manipulation of Taylor bubbles.

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Section: Resultssupporting

confidence: 75%

“…(a) Taylor bubble length comparison for different injection lengths (