Segmented gas–liquid flow characterization in rectangular microchannels

Fries, Donata M.; Trachsel, Franz; Rohr, Philipp Rudolf von

doi:10.1016/j.ijmultiphaseflow.2008.07.002

Cited by 158 publications

(84 citation statements)

References 30 publications

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“…The gas bubble shape in the cross section is also non-axisymmetric as the corners is affected by larger viscous forces than the regions near the center of the walls (Kolb and Cerro, 1991). However, the gas bubble shape presents a shifting from non-axisymmetric to axisymmetric above a transitional value of Ca (O(10 −2 )) (Fries et al, 2008;Han and Shikazono, 2009a;Kolb and Cerro, 1991;Kuzmin et al, 2011;Thulasidas et al, 1995), as shown in Fig. 1(b) and (c).…”

Section: Introductionmentioning

confidence: 93%

“…Bubble shape model Many researches have focused on the gas bubble shape and the liquid film thickness in square capillaries or microchannels (Fries et al, 2008;Kolb and Cerro, 1991;Thulasidas et al, 1995). So far, experimentally determining film thickness and bubble shape in microchannels is rather difficult, especially with rectangular crosssection.…”

Section: Film Thicknessmentioning

confidence: 99%

“…The figuration of slug flow contains regular sized gas bubbles that are longer than the channel diameter or width. The gas bubbles are surrounded by a thin liquid film with the bubble area occupying almost the entire channel cross-section (Fries et al, 2008;Thulasidas et al, 1995). Low axial mass transfer or back mixing occurs between two adjacent liquid slugs.…”

Section: Introductionmentioning

confidence: 99%

“…These merits make slug flow an ideal regime for improving the reaction performance. Wide attention has been paid to the bubble formation process (Fu et al, 2009;Garstecki et al, 2006;Pohorecki and Kula, 2008;van Steijn et al, 2007), the gas bubble and the liquid slug length (Garstecki et al, 2006;Leclerc et al, 2010;Qian and Lawal, 2006;Sobieszuk et al, 2010), the liquid film thickness around bubbles (Fries et al, 2008;Han and Shikazono, 2009a;Thulasidas et al, 1995), the phase distribution (Choi et al, 2011;Kawahara et al, 2005;Saisorn and Wongwises, 2010), the pressure drop (Kreutzer et al, 2005a(Kreutzer et al, , 2005bYue et al, 2009), and the mass transfer (Sobieszuk et al, 2011;van Baten and Krishna, 2004;Vandu et al, 2005), etc. However, a full understanding of slug slow for optimizing the design of microreactor remains pendent.…”

Section: Introductionmentioning

confidence: 99%

“…The thickness of liquid film has mainly been studied in circular capillaries that it was considered as a function of the capillary number (Ca) (Aussillous and Quéré, 2000;Bretherton, 1961;Han and Shikazono, 2009b;Kreutzer et al, 2005b). More recently, attention has been paid to microchannels with other cross sections (Fries et al, 2008;Han and Shikazono, 2009a;Kolb and Cerro, 1991;Kuzmin et al, 2011;Thulasidas et al, 1995). The liquid film distribution in square capillaries is not cylindrically symmetric due to the corners, which differs from that of their circular counterparts.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Characteristics of slug flow with inertial effects in a rectangular microchannel

Yao

Zhao

et al. 2013

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 93%

Section: Film Thicknessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characteristics of slug flow with inertial effects in a rectangular microchannel

Yao

Zhao

et al. 2013

Chemical Engineering Science

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The effect of system pressure on gas‐liquid slug flow in a microchannel

et al. 2013

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Characteristics of gas-liquid two-phase flow under elevated pressures up to 3.0 MPa in a microchannel are investigated to provide the guidance for microreactor designs relevant to industrial application. The results indicate that a strong leakage flow through the channel corners occurs although the gas bubbles block the channel. With a simplified estimation, the leakage flow is shown to increase with an increase in pressure, leading to a bubble formation shifting from transition regime to squeezing regime. During the formation process, the two-phase dynamic interaction at the Tjunction entrance would have a significant influence on the flow in the main channel as the moving velocity of generated bubbles varies periodically with the formation cycle. Other characteristics such as bubble formation frequency, bubble and slug lengths, bubble velocities, gas hold-up, and the specific surface area are also discussed under different system pressures.

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Bubble breakup with permanent obstruction in an asymmetric microfluidic T‐junction

Wang

Zhu

2014

AIChE Journal

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Bubble breakup with permanent obstruction in an asymmetric microfluidic T‐junction is investigated experimentally. The breakup process of bubbles can be divided into three stages: squeezing, transition, and pinch‐off stages. In the squeezing stage, the thinning of the bubble neck is mainly controlled by the velocity of the fluid flowing into the T‐junction, and the increase of the liquid viscosity can promote this process. In the transition stage, the minimum width of bubble neck decreases linearly with time. In the pinch‐off stage, the effect of the velocity of the fluid flowing into the T‐junction on the thinning of the bubble neck becomes weaker, and the increase of the liquid viscosity would delay this process. The evolution of the minimum width of the bubble neck with the remaining time before the breakup can be scaled by a power–law relationship. The bubble length has little influence on the whole breakup process of bubbles. © 2014 American Institute of Chemical Engineers AIChE J, 61: 1081–1091, 2015

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Segmented gas–liquid flow characterization in rectangular microchannels

Cited by 158 publications

References 30 publications

Characteristics of slug flow with inertial effects in a rectangular microchannel

Characteristics of slug flow with inertial effects in a rectangular microchannel

The effect of system pressure on gas‐liquid slug flow in a microchannel

Bubble breakup with permanent obstruction in an asymmetric microfluidic T‐junction

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