A model for predicting axial mixing during gas–liquid Taylor flow in microchannels at low Bodenstein numbers

Salman, W; Gavriilidis, Asterios; Angeli, Panagiota

doi:10.1016/j.cej.2003.10.027

Cited by 47 publications

(28 citation statements)

References 13 publications

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“…Although they ignored the effects of convection in the recirculating region, they showed a good agreement between their mathematical model and experimental results. More recently, Salman et al 23,24 proposed a model based on a one-dimensional convection-diffusion equation. They found that the axial dispersion is in general low and increases with increasing capillary number and slug and bubble lengths.…”

Section: Introductionmentioning

confidence: 99%

A computational study of axial dispersion in segmented gas-liquid flow

2007

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Axial dispersion of a tracer in a two-dimensional gas-liquid flow is studied computationally using a finite-volume/front-tracking method. The effects of Peclet number, capillary number, and segment size are examined. At low Peclet numbers, the axial dispersion is mainly controlled by the convection through the liquid films between the bubbles and channel walls. In this regime, the computational results are found to be in a very good agreement with the existing model due to Pedersen and Horvath ͓Ind. Eng. Chem. Fundam. 20, 181 ͑1981͔͒. At high Peclet numbers, the axial dispersion is mainly controlled by the molecular diffusion, with some convective enhancement. In this regime, a new model is proposed and found to agree well with the computational results. These Peclet number regimes are shown to persist for different slug lengths. The axial dispersion is found to depend weakly on the capillary number in the diffusion-controlled regime. Finally, computational simulations are performed for the cases of six bubbles to mimic bubble trains, and results are compared with the theoretical models.

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Section: Introductionmentioning

confidence: 99%

A computational study of axial dispersion in segmented gas-liquid flow

2007

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“…The separation of the bulk liquid with the bubbles significantly reduces axial mixing in the liquid (Thulasidas et al, 1999;Salman et al, 2004). The film surrounding the bubbles is the only means of communication between two successive slugs and in the majority of cases its thickness is only a fraction of a percentage of the tube diameter.…”

Section: Introductionmentioning

confidence: 99%

On the formation of Taylor bubbles in small tubes

Salman

Gavriilidis

Angeli

2006

Chemical Engineering Science

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“…6.7. For relatively low flow rates, mass transfer by diffusion superimposed on the vortices results in well-mixed conditions inside the slugs [44]. This allows rapid transfer of solute in a moving slug that can far exceed the rates expected for diffusion from slug ends.…”

Section: Dispersed-phase Microcontactorsmentioning

confidence: 98%