A review on numerical studies of slug flow hydrodynamics and heat transfer in microtubes and microchannels

Talimi, Vandad; Muzychka, Y. S.; Kocabıyık, Serpil

doi:10.1016/j.ijmultiphaseflow.2011.10.005

Cited by 155 publications

(66 citation statements)

References 74 publications

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“…3c) which are pertinent to micro-reactor systems [5][6][7][8] and heat transfer [18,19,[23][24][25][26].…”

Section: Moving Reference Frame Methods For Spurious Current Suppressionmentioning

confidence: 99%

“…Recently, Magnini et al [23,24] investigated microchannel flow boiling in this regime, and found evaporation from the liquid film to be the dominant mechanism of heat transfer. More detailed accounts of the development of theoretical and numerical models can be found in recent review articles on the subject [8,25,26]. Most prior numerical studies, as summarized by Talimi et al [26], were limited to Ca > ~0.005, although flow behavior at smaller…”

Section: Introductionmentioning

confidence: 99%

“…More detailed accounts of the development of theoretical and numerical models can be found in recent review articles on the subject [8,25,26]. Most prior numerical studies, as summarized by Talimi et al [26], were limited to Ca > ~0.005, although flow behavior at smaller…”

Section: Introductionmentioning

confidence: 99%

“…The continuum surface force (CSF) model [27] is one of the most popular methods for numerical treatment of surface tension forces, and is implemented in commercial computational fluid dynamics software packages [8,25,26]; however, it also induces unphysical spurious currents that hinder numerical investigation under small Capillary number conditions [28]. A large body of research has focused on developing methods to reduce these spurious currents (see review by Wörner [8]).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spurious Current Suppression in VOF-CSF Simulation of Slug Flow through Small Channels

Zhang

Weibel

Garimella

2014

Numerical Heat Transfer, Part A: Applications

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A numerical treatment is proposed to minimize the creation of unphysical, spurious currents in modeling liquid-gas slug flow using the volume of fluid-continuum surface force (VOF-CSF) method. An elongated gas slug drawn into a small circular channel initially filled with liquid is considered. To suppress spurious currents formed by numerical errors in calculation of the surface tension force at small Capillary numbers (Ca < 0.01), an artificial relative reference frame is specified with motion in a direction opposite that of the flow. An increase in the local relative velocity magnitude near the interface is demonstrated to be the key mechanism for spurious

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“…3c) which are pertinent to micro-reactor systems [5][6][7][8] and heat transfer [18,19,[23][24][25][26].…”

Section: Moving Reference Frame Methods For Spurious Current Suppressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spurious Current Suppression in VOF-CSF Simulation of Slug Flow through Small Channels

Zhang

Weibel

Garimella

2014

Numerical Heat Transfer, Part A: Applications

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“…The results showed that the bubble and slug lengths increase as a function of the gas and liquid flow rate ratios. Numerical studies on the hydrodynamic and heat transfer characteristics of twophase flows in small tubes and channels were reviewed [15]. The review was then categorized into two groups of studies: circular and non-circular channels.…”

Section: American Journal Of Mechanical Engineeringmentioning

confidence: 99%

Experimental Study and CFD Simulation of Two-Phase Flow around Multi-Shape Obstacles in Enlarging Channel

Habeeb¹,

Al-Turaihi²

2013

AJME

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Experimental and numerical studies are investigated to study the two-phase flow phenomena around multi-shape obstacles in a rectangular enlarging channel which has the dimensions (10 × 3 × 70 cm) enlarged from assembly circular tube of the two phases. Experiments are carried out in the channel with air-water flow with different air and water flow rates. These experiments are aimed to visualize the two phase flow phenomena as well as to study the effect of pressure difference through the channel with the existence of the obstacle. All sets of the experimental data in this study are obtained by using a pressure transducer and visualized by a video camera for different water discharges (20, 25, 35 and 45 l/min) and different air discharges (10, 20, 30 and 40 l/min). While the numerical simulation is conducted by using commercial Fluent CFD software to investigate the steady and unsteady turbulent two dimensional flows for different air and water velocities. The results showed that when air or water discharge increases, high turbulence is appear which generate more bubbles and waves and the mean pressure difference increases. Also, in a water slug, bubbles move slower than the liquid.

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Droplet breakup in the square microchannel with a short square constriction to generate slug flow

Wang

Liu

et al. 2022

AIChE Journal

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Droplet breakup in microconstrictions is an important phenomenon in industrial applications. This work aimed to investigate the droplet breakup in the square microchannel with a short square constriction to generate the slug flow, which drew little attention before. Mechanism analysis indicated that this breakup process included the shear-force-dominated, squeezing-force-dominated, and pinch-off stages. Nonuniform daughter droplets were generated in the constriction with their interface restricted in the horizontal and perpendicular directions by the microchannel walls.The average relative deviation of the daughter droplet size was <30%, much lower than that for the breakup with the daughter droplet restricted only in one direction.An empirical equation with a deviation of <20% was provided to show the dependence of the daughter droplet size on the operation conditions. The comparison results suggested that the different restriction effects of microchannel wall on daughter droplets led to the different breakup mechanisms in different constrictions.

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A review on numerical studies of slug flow hydrodynamics and heat transfer in microtubes and microchannels

Cited by 155 publications

References 74 publications

Spurious Current Suppression in VOF-CSF Simulation of Slug Flow through Small Channels

Spurious Current Suppression in VOF-CSF Simulation of Slug Flow through Small Channels

Experimental Study and CFD Simulation of Two-Phase Flow around Multi-Shape Obstacles in Enlarging Channel

Droplet breakup in the square microchannel with a short square constriction to generate slug flow

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