Experiments and modeling on bubble uniformity of Taylor flow in T-junction microchannel

Peng, Dongyue; Feng, Xin; Zhang, Lexiang; Yu, Hua-yin; Zhang, Weihua

doi:10.1016/j.ces.2015.01.064

Cited by 13 publications

(4 citation statements)

References 43 publications

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“…3.1. Our results in millifluidic flow fit with the ''scaling law'' obtained for two-phase microfluidic flow in the literature [46][47][48] as follows:…”

Section: Correlation For Tuning the Slug Size And Liquid Fraction Wit...supporting

confidence: 82%

Continuous Generation of Gas‐Water Slugs with Improved Size Uniformity at a Tunable Scale

et al. 2023

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Slug flow has received increased interest due to the slugs serving as individual microreactors for enhanced process efficiency and product quality. In this study, slugs were continuously generated in various scales and sizes, with slug size uniformity studied by in‐line imaging. Different strategies of gas flow control and slug scale‐up were evaluated regarding the slug size distribution. With modified gas flow control, the slug uniformity was improved significantly. Slug flow can also be scaled up without sacrificing slug size uniformity, either by increasing the reservoir feeding volume or the flow rate. The type of gas used (air and nitrogen) to generate slugs does not affect the slug size uniformity. A narrow slug size distribution can improve the particle size distribution and, hence, lead to better product quality.

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“…3.1. Our results in millifluidic flow fit with the ''scaling law'' obtained for two-phase microfluidic flow in the literature [46][47][48] as follows:…”

Section: Correlation For Tuning the Slug Size And Liquid Fraction Wit...supporting

confidence: 82%

Continuous Generation of Gas‐Water Slugs with Improved Size Uniformity at a Tunable Scale

et al. 2023

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“…Once the bubble neck width is reduced to 0.3 W, the neck radius turns to be concave and the accumulated pressure is suddenly released, leading to drastic rising of the gas flow rate. Besides the compressibility, gas bubbles leaving the microchannel also lead to perturbation in the flow in the main channel …”

Section: Resultsmentioning

confidence: 99%

Formation of liquid–liquid slug flow in a microfluidic T‐junction: Effects of fluid properties and leakage flow

Yao

Liu

et al. 2017

AIChE Journal

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Characteristics of liquid-liquid slug flow are investigated in a microchannel with focus on the leakage flow that bypasses droplets through channel gutters. The results show that the leakage flow rate varies in a range of 10.7-53.5% and 8.3-30.9% of the feed flow rate, during the droplet formation (i.e., at T-junction) and downstream flow (i.e., in the main channel), respectively, which highly depends on Ca number and wetting condition. Empirical correlations are proposed to predict them for perfectly and partially wetting conditions. Leakage flow contribution is further used to improve the Garstecki model for size scaling in order to extend its suitability for both squeezing and shearing regimes. The instantaneous flow rates of the immiscible phases are found to fluctuate periodically with the formation cycles, but in opposite behavior. The effect of the presence of leakage flow on such fluctuation are investigated and compared with gas-liquid systems.

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“…Gas inlet pressure was monitored with a pressure sensor of Yizhong PY301 to identify the start‐up process. The monitoring position and detailed identification process were similar to those used in a previous study by Peng et al…”

Section: Methodsmentioning

confidence: 99%

“…Gas inlet pressure was monitored with a pressure sensor of Yizhong PY301 to identify the start-up process. The monitoring position and detailed identification process were similar to those used in a previous study by Peng et al 35 The optical measuring system is also shown in Figure 1c, which mainly includes a semiconductor laser source of Xilong FC-1550-070-SM, an optical splitter of Huawei SPL9101-P104-SC/UPC, two optical fibers, an optical fiber collimator, photo-detectors, and a data acquisition card of Art-Control PCI8532. During operation, the laser generated from the laser source was first split into two beams and transmitted through the two respective optical fibers, then two laser beams passed through the transparent PMMA plate and were received by the photo-detectors.…”

Section: Methodsmentioning

confidence: 99%

Nonlinear time‐series analysis of optical signals to identify multiphase flow behavior in microchannels

et al. 2016

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This study provides an insight into the instability and irregularity of multiphase flows in microchannels. Using a homemade optical measuring system, time series related to two‐phase flow dynamics under different operating conditions, fluids, and channel lengths were collected and analyzed via a nonlinear characteristic parameter, Kolmogorov entropy (KE). Our results reveal that higher KE corresponds to unstable flow behavior, while lower KE refers to steady flow behavior; higher KE values appear at comparatively low or high gas flow rates, and most Taylor flow regime appeared at proper operating conditions with small KE. An equation derived based on the definition of KE is proposed to better understand KE characteristics, which include bubble break‐up impact and gas/liquid flow rate ratio. Predictions from the proposed analytical equation agree with experimental results, suggesting that the equation effectively identifies unstable flows and can be used to ensure stable and predictable multiphase flows in microchannels. © 2016 American Institute of Chemical Engineers AIChE J, 63: 2378–2385, 2017

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Experiments and modeling on bubble uniformity of Taylor flow in T-junction microchannel

Cited by 13 publications

References 43 publications

Continuous Generation of Gas‐Water Slugs with Improved Size Uniformity at a Tunable Scale

Continuous Generation of Gas‐Water Slugs with Improved Size Uniformity at a Tunable Scale

Formation of liquid–liquid slug flow in a microfluidic T‐junction: Effects of fluid properties and leakage flow

Nonlinear time‐series analysis of optical signals to identify multiphase flow behavior in microchannels

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