Visual observations of flow patterns in downward air-water two-phase flows in a vertical narrow rectangular channel

Kim, Tae Hyeon; Chalgeri, Vikrant Siddharudh; Yoon, Woosung; Yun, Byong-Jo; Jeong, Ji Hwan

doi:10.1016/j.anucene.2017.12.053

Cited by 19 publications

(4 citation statements)

References 33 publications

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“…The results display a great influence of the pipe inclination on two-phase flow structure and the twophase flow variables at small amounts of gas and liquid flow-rates. Kim et al [21] studied the flow regimes of two-phase flow through a downward rectangular channel. The results show some different flow patterns such as falling film flow pattern and large-bubbly flow which identified in the low liquid superficial velocity wherever buoyancy force has a great influence.…”

Section: Introductionmentioning

confidence: 99%

Experimental Examination of Gas-liquid Two-phase Flow Patterns in an Inclined Rectangular Channel with 90° Bend for Various Vertical Lengths

2022

IJE

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In order to realize the behavior of two-phase flow in an inclined rectangular channel with 90̊ bend for various vertical lengths, an experimental investigation has performed. The test section (a chanel with 30 m length) contains two horizontal parts and a middle vertical section. Three vertical lengths of 50, 100 and 150 cm were utilized along the test section. The cross section of the rectangular channel is 10 cm × 15 cm. Air and water were the fluids used in this work. Various flow patterns are created by varying the volumetric flow-rates of gas and liquid; the air and water flow rates were in the range of 2 to 10 𝑚 3 ℎ ⁄ and 34 to 235𝑚 3 ℎ ⁄ , respectively. The high speed video system was utilized to achieve image subsequence of the flow under various conditions. The effects of vertical length on flow regimes and pattern transition borders are examined. According to the flow visualization, no vortex was observed in the vertical section. The significant flow regime in the vertical section is churn flow regime. It is concluded that the flow pattern structures are not greatly affected by changing the vertical length.

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Section: Introductionmentioning

confidence: 99%

Experimental Examination of Gas-liquid Two-phase Flow Patterns in an Inclined Rectangular Channel with 90° Bend for Various Vertical Lengths

2022

IJE

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“…Two-phase flow in corrugated pipe with a vertical position has been identified and compared with smooth pipe [9]. The droplet size of bubbles in grooved pipes indicates larger liquid fragments compared to smooth pipes.…”

Section: Introductionmentioning

confidence: 99%

“…Choosing the correct number of grooves can minimize energy loss due to friction. Flow-through grooves can achieve better drag reduction compared to smooth pipes because they reduce shear stress and impede vortex flow translation [4] [6][7][8][9]. After conducting research, it has been determined that grooves can be utilized for commercial purposes to decrease drag.…”

Section: Introductionmentioning

confidence: 99%

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Pressure Drop and Void Fraction of Two-Phase Flow (Air-Water) in Grooved Vertical Pipes

Aji,

Suwandhy A. S,

Gunawan

et al. 2023

Mekanika: Majalah Ilmiah Mekanika

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Two-phase flows consisting of liquids and gases are often found in everyday life and are used on an industrial scale. In an industrial environment, this flow has many weaknesses, including pressure drop and void fraction. One strategy to reduce losses that arise is to use passive methods. The passive method used is to utilize the shape of the grooves in the channel. In this study, the flow is used to determine its effect on the pressure drop and void fraction that appears in two-phase flow. The experimental method was used for this study. The test pipe is equipped with 16 grooves, while the smooth pipe (without grooves) is used as a comparison. The test pipe is made of acrylic material. The water fluid is circulated using a centrifugal water pump with a superficial speed of 0.33-0.42 m/s. Air fluid is supplied using a compressor with superficial speeds of 0.049, 0.066, and 0.082 m/s. Measurement of pressure drop was carried out using a pressure transmitter with an Arduino data logger. The void fraction is calculated by determining the ratio of the volume fraction of water and air in the test tube. The results of the study revealed that the use of 16 grooves in the pipe can reduce the pressure drop and cavity fraction that appears when compared to smooth pipes.

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Two-phase flow characteristics of gas-liquids in microchannels using electrical resistance tomography

Tao

Jin

et al. 2021

Heat Mass Transfer

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Visual observations of flow patterns in downward air-water two-phase flows in a vertical narrow rectangular channel

Cited by 19 publications

References 33 publications

Experimental Examination of Gas-liquid Two-phase Flow Patterns in an Inclined Rectangular Channel with 90° Bend for Various Vertical Lengths

Experimental Examination of Gas-liquid Two-phase Flow Patterns in an Inclined Rectangular Channel with 90° Bend for Various Vertical Lengths

Pressure Drop and Void Fraction of Two-Phase Flow (Air-Water) in Grooved Vertical Pipes

Two-phase flow characteristics of gas-liquids in microchannels using electrical resistance tomography

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