Measurement of Bubble Group Characteristics of Gas-Liquid Two-Phase Flow by Laser Cross Section Imaging

Wanyao Tan; Xiaojing Liu; Decao Wu; Binbin Luo; Mingfu Zhao; Yufeng Guo; Junyu Long; Ying Zhang

doi:10.3788/AOS202242.1510001

Acta Optica Sinica, Volume. 42, Issue 15, 1510001(2022)

Measurement of Bubble Group Characteristics of Gas-Liquid Two-Phase Flow by Laser Cross Section Imaging

Wanyao Tan¹, Xiaojing Liu², Decao Wu^1、*, Binbin Luo^1、**, Mingfu Zhao¹, Yufeng Guo¹, Junyu Long¹, and Ying Zhang¹

¹Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology, Chongqing 400054, China

²School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

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Figures & Tables(15)

Fig. 1. Bubble image acquisition device. (a) Physical picture; (b) schematic diagram

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Fig. 2. Flow chart of bubble characteristic parameter extraction experiment

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Fig. 3. Shooting method of calibration image and original calibration image obtained by camera. (a) Shooting method of calibration image; (b) original calibration image obtained by camera

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Fig. 4. Bubble image preprocessing.（a）Typical bubble image；（b）binary image with inverted color；（c）filtered image

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Fig. 5. Bubble images before and after roundness value classification. (a) Original bubble image before roundness value classification; (b) regular bubble image; (c) irregular bubble image

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Fig. 6. Flow chart of overlapping or adhesive bubble segmentation algorithm

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Fig. 7. Schematic diagram of segmentation results of typical overlapping or adhesive bubbles

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$Instantaneous bubble quantity statistics and instantaneous void fraction curve. (a) Instantaneous bubble quantity statistics; (b) instantaneous void fraction curve$

Fig. 8. Instantaneous bubble quantity statistics and instantaneous void fraction curve. (a) Instantaneous bubble quantity statistics; (b) instantaneous void fraction curve

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$Analysis of cross-sectional void fraction.(a) Void fraction varying with quality void fraction; (b) error analysis of void fraction between measured value and theoretical value$

Fig. 9. Analysis of cross-sectional void fraction.(a) Void fraction varying with quality void fraction; (b) error analysis of void fraction between measured value and theoretical value

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$Imaging of mean value of cross-sectional void fraction$

Fig. 10. Imaging of mean value of cross-sectional void fraction

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Fig. 11. Target bubble tracking image and bubble ellipsoid reconstruction. (a) Target bubble tracking image; (b) bubble ellipsoid reconstruction

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Fig. 12. Histogram of bubble group particle size distribution at different gas flow rates. (a) 60 mL/min; (b) 100 mL/min

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Table 1. Physical parameters of liquid phase
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Table 1. Physical parameters of liquid phase
Temperature /℃
ρ₁ /
（kg·m^-3）
μ₁ /（mPa·s）
σ /
（mN·m^-1）
8 999.8 1.38 74

Table 2. Particle size and velocity analysis of multiple bubbles
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Table 2. Particle size and velocity analysis of multiple bubbles
Bubble No. Particle size /mm Velocity /（ $m \cdot s^{- 1}$ ）
1 2.06 0.140
2 1.05 0.136
3 1.09 0.134
4 2.27 0.143
5 2.39 0.144
6 2.56 0.153
7 2.64 0.159
8 2.33 0.142
9 2.30 0.142

Table 3. Mean statistics of bubble group characteristics

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Table 3. Mean statistics of bubble group characteristics

Scene

No.

Gas flow /

（ $m L \cdot m i n^{- 1}$ ）

Average velocity of image method /

（ $m \cdot s^{- 1}$ ）

Average velocity of conductivity method /（

m \cdot s^{- 1}

）

Error rate of average velocity /%

Average particle size of image method /mm

Average particle size of conductivity method /mm

Error rate of average particle

size /%

0.152

0.155

2.07

2.47

2.40

-2.91

100

0.157

0.164

4.03

2.54

2.61

6.27

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Wanyao Tan, Xiaojing Liu, Decao Wu, Binbin Luo, Mingfu Zhao, Yufeng Guo, Junyu Long, Ying Zhang. Measurement of Bubble Group Characteristics of Gas-Liquid Two-Phase Flow by Laser Cross Section Imaging[J]. Acta Optica Sinica, 2022, 42(15): 1510001

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