Effect of wall contact angle and carrier phase velocity on the flow physics of gas–liquid Taylor flows inside microchannels

Vivekanand, S. V. B.; Raju, V. Ramachandra

doi:10.1007/s11696-018-0668-3

Cited by 13 publications

(7 citation statements)

References 58 publications

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“…A larger surface tension contributes to a more stable phase boundary, which hinders the breakup of bubbles (the formation of bubbly flow) or the enlargement of gas bubbles by coalescence (formation of Taylor–annular flow) . The strong impact of surface tension on bubble length in Taylor flow, i.e., the transition to bubbly flow, was also verified in several studies …”

Section: State-of-the-artmentioning

confidence: 66%

Gas–Liquid Flow Regime Prediction in Minichannels: A Dimensionless, Universally Applicable Approach

Haase

Bauer

Graf

2020

Ind. Eng. Chem. Res.

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Apparatus containing micro-or minichannels are seen as promising tools to intensify several chemical engineering processes. For gas−liquid systems, the apparatus should operate in the Taylor flow regime due to its excellent mass transfer coefficients and low back-mixing. The presence of the regime depends on several geometric and operational parameters as well as material properties. To the best knowledge of the authors, the available information stored in flow maps for specific conditions has never been generalized. This work presents novel decision trees that enable the boundaries of Taylor flow in minichannels to be predicted, which are based on the data of 97 different flow maps covering a broad range of configurations. The developed criteria are mathematical functions that describe the transitions from Taylor to bubbly flow, Taylor−annular flow, or churn flow. These functions involve 7 dimensionless groups, namely u G,s /u L,s , μ G /μ L , ρ G /ρ L , Re L , We L , Θ*, and, a channel form factor, R A .

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Section: State-of-the-artmentioning

confidence: 66%

Gas–Liquid Flow Regime Prediction in Minichannels: A Dimensionless, Universally Applicable Approach

Haase

Bauer

Graf

2020

Ind. Eng. Chem. Res.

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“…Ouyang et al [16] explained that the dynamic gradient adaption approach [41] was applied to refine and coarsen during the unsteady calculation; the grid was refined and coarsened with each time step. Meanwhile, studies of Vivekanand and Raju [17] proposed that the gradient adaption method was computationally less expensive as the cells near the interface were refined and the cells elsewhere were maintained.…”

Section: Independence Of Dynamic Grid Refinementmentioning

confidence: 99%

“…The accurate description of the relationship between the enhanced heterogeneous separation and the concave-wall jet was a challenge due to the centrifugal force field generated by the jet in the vertical cylinder separator with a tangential inlet. The method of a refinement grid has been described in detail by Sammon [14] and applied by Andersson and Helmi [15], Ouyang et al [16], and Vivekanand and Raju [17]. The method was recognized, as shown by the experimental work of Charin et al [18], which is a classic reference on droplet dynamics.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristic Analysis of a Single Droplet in a Liquid‐Liquid Concave‐Wall Jet

Zhang

Gong

et al. 2022

Chem Eng & Technol

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Liquid‐liquid swirling flow is directly affected by the dynamic behavior of discrete droplets. Large eddy simulation combined with the volume‐of‐fluid model (LES‐VOF) was adopted to simulate the dynamic behavior of a CCl4 single droplet under water in a concave‐wall jet. There were three modes of droplets: non‐breakup, binary‐breakup, and multiple‐breakup droplets. The binary‐breakup droplet was sheared by the layer between the jet and the main flow, and the multiple‐breakup droplet was sheared by the boundary layer of the wall. Deformation and breakup were the processes of balancing the internal and external droplet vorticity. The largest pressure difference between the internal and external side of the liquid film was the primary reason for droplet breakup.

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“…Volume of fluid (VOF) model can simulate two or more non-mixed fluids, and it is more suitable for simulations with large variations in gas-liquid interface (Gao and Morley et al, 2003;Vivekanand and Raju1 2019;Kihara. and Obata et al, 2019).…”

Section: Governing Equationsmentioning

confidence: 99%

Effects of Serrated Pulsating Airflow on Liquid Film Evaporation in a Vertical Channel: A Numerical Study

Chen¹,

Zhong²

2020

Frontiers in Heat and Mass Transfer

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Effects of serrated pulsating airflow on liquid film evaporation in a falling film channel was numerically studied based on a two-dimensional model. The mechanism of pulsating airflow evaporation was studied as the pulsating airflow swept across the vertical liquid film surface at the stagnant temperature. Effects of amplitude, frequency, and velocity of the serrated pulsating airflow at certain evaporation time on evaporation were analyzed. Compared with the uniform airflow, the highest relative evaporation of liquid film on vertical pipe inner surface was increased by about 0.3 %. When the airflow was pulsating, the cycle of vapor mass flow rate was the same as the cycle of pulsating airflow. Pulsating airflow disturbed the boundary layer periodically and carried the vapor away; this intensified the mass transfer of liquid film, hence promoting vapor generation under certain conditions.

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Effect of wall contact angle and carrier phase velocity on the flow physics of gas–liquid Taylor flows inside microchannels

Cited by 13 publications

References 58 publications

Gas–Liquid Flow Regime Prediction in Minichannels: A Dimensionless, Universally Applicable Approach

Gas–Liquid Flow Regime Prediction in Minichannels: A Dimensionless, Universally Applicable Approach

Dynamic Characteristic Analysis of a Single Droplet in a Liquid‐Liquid Concave‐Wall Jet

Effects of Serrated Pulsating Airflow on Liquid Film Evaporation in a Vertical Channel: A Numerical Study

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