Two-phase flow patterns in short horizontal rectangular microchannels

Chinnov, E. A.; Ronshin, F. V.; Kabov, Oleg

doi:10.1016/j.ijmultiphaseflow.2015.11.006

Cited by 62 publications

(34 citation statements)

References 35 publications

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“…The liquid film is formed on the top wall of microchannel at a distance of several millimeters from the zone of liquid input to the microchannel. In previous experiments, in the microchannel with the height of less than 200 µm, the film has been formed on the top wall of microchannel directly near the liquid input into the microchannel due to frontal instability [11]. Figure 3a represents the annular regime at USG = 83.333 m/s, USL= 0.667 m/s.…”

Section: Experimental Setup and Resultsmentioning

confidence: 85%

“…At very low superficial liquid velocities, gas moves in the central part of the microchannel, and the bulk of liquid moves at the periphery along the sidewalls and as the jets in the center of microchannel. In microchannels higher than 100 microns, liquid flows 2 EPJ Web of Conferences 159, 00040 (2017) DOI: 10.1051/epjconf/201715900040 AVTFG2016 only along the sidewalls of microchannel [11]. With increasing superficial liquid velocity, it starts occupying a larger part of microchannel, and a gas flow moves in the center.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…In [7][8][9], the influence of the inlet section on the two-phase flow structure is analyzed, and it is shown that the conditions of gas and liquid input affect substantially the borders of two-phase flows in microchannels. The flows in the rectangular channels of various heights and widths are compared in [10][11][12]. It has been determined that the height and width of the horizontal microchannel affect substantially the boundaries between the flow regimes in a microchannel.…”

Section: Introductionmentioning

confidence: 99%

“…It has been determined that the height and width of the horizontal microchannel affect substantially the boundaries between the flow regimes in a microchannel. The mechanisms that influence the formation of two-phase flow are studied in [11,12]. Two new types of instability (frontal and lateral), responsible for the flow regime formation in microchannels depending on the channel sizes and liquid and gas flow rates, are distinguished.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Features of two-phase flow in a microchannel of 0.05×20 mm

Ronshin

2017

EPJ Web Conf.

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Section: Experimental Setup and Resultsmentioning

confidence: 85%

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Features of two-phase flow in a microchannel of 0.05×20 mm

Ronshin

2017

EPJ Web Conf.

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“…The number of publications on this subject is very limited. The gas-liquid flows in the short horizontal mini-and microchannels have been studied in [6][7][8][9][10]. It is shown that there are many factors affecting on the structure of the two-phase flow.…”

Section: Introductionmentioning

confidence: 99%

Features of two-phase flow patterns in horizontal rectangular microchannels of height 50 μm

2016

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Abstract. The horizontal microchannel with the height of 50 micrometres and width of 40 mm of a rectangular cross-section has been used to study two-phase flow. The classical patterns of two-phase flow in the channel (bubble, stratified, churn , jet, and annular) have been detected. Experimental information allows us to define the characteristics of the regimes and to determine precisely the boundaries between the patterns of the two-phase flows.

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Numerical investigation of drop dynamics in presence of wettability gradient inside a serpentine channel of proton exchange membrane fuel cell

Malhotra

Ghosh

2020

Int J Energy Res

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Summary Water management significantly affects the performance of a proton exchange membrane fuel cell (PEMFC). Therefore, interest is felt to numerically investigate water droplet movement and slug formation inside the microchannel (gas) of PEMFC. Two important parameters—water coverage ratio and pressure drop have been studied in detail. A U‐shaped geometry with a round corner is used for this purpose. 3D unsteady‐state models are used to study the drop dynamics using commercial CFD software ANSYS FLUENT 18. For tracking of water drop dynamics, the volume of fluid model is used. Two different situations are simulated. In the first case, the investigation of hydrodynamics of the 0.4 mm drop adhered to the surface of the gas diffusion layer (GDL) has been done. In the second case, simulation of air‐water slug flow has been done. GDL surfaces at upstream and downstream of bend are modified using user‐defined functions, such that the GDL surface has a dynamic contact angle with respect to the direction of flow. This makes it a continuously hydrophilic surface at upstream and continuously hydrophobic surface at downstream with respect to the direction of flow. The impact of GDL wettability on water retention and removal has been discussed. It is noted that the presence of a gradient facilitates the removal of water drop adhered to the GDL surface. For the case of a suspended drop with an increase of 1°/mm in the magnitude of the gradient, a decrease of 30% is observed in water coverage ratio and pressure drop observed in the channel. Such modified surfaces aids in the conversion of slugs to film at the downstream of bend that reduces maldistribution. The pressure fluctuations and average pressure drop are reduced by 66% when subjected to the aforementioned hybrid gradient.

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Two-phase flow patterns in short horizontal rectangular microchannels

Cited by 62 publications

References 35 publications

Features of two-phase flow in a microchannel of 0.05×20 mm

Features of two-phase flow in a microchannel of 0.05×20 mm

Features of two-phase flow patterns in horizontal rectangular microchannels of height 50 μm

Numerical investigation of drop dynamics in presence of wettability gradient inside a serpentine channel of proton exchange membrane fuel cell

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