Gas production characteristics of a porous media-Venturi bubble generator

doi:10.11949/0438-1157.20240317

CIESC Journal ›› 2024, Vol. 75 ›› Issue (10): 3488-3497.DOI: 10.11949/0438-1157.20240317

• Fluid dynamics and transport phenomena • Previous Articles Next Articles

Gas production characteristics of a porous media-Venturi bubble generator

Weihua CAI¹^,³(), Yuhang WANG¹^,⁴, Wenchao ZHANG¹^,⁵(), Shaodan LI², Xinlong LIU¹, Ben'an CAI¹(), Jincheng WANG¹

^1.Laboratory of Thermo-fluid Science and Nuclear Engineering, School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, Jilin, China
^2.Wuhan Second Ship Design and Research Institute, Wuhan 430205, Hubei, China
^3.School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, Jiangxi, China
^4.PetroChina Daqing Oilfield Limited Company, Daqing 163453, Heilongjiang, China
^5.Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education, Tsinghua University, Beijing 100084, China

Received:2024-03-20 Revised:2024-05-09 Online:2024-11-04 Published:2024-10-25
Contact: Wenchao ZHANG, Ben'an CAI

多孔介质-文丘里气泡发生器产气特性

蔡伟华¹^,³(), 王玉航¹^,⁴, 张文超¹^,⁵(), 李少丹², 刘鑫龙¹, 蔡本安¹(), 王金成¹

^1.东北电力大学能源与动力工程学院热流科学与核工程实验室，吉林吉林 132012
^2.武汉第二船舶设计研究院，湖北武汉 430205
^3.华东交通大学土木工程与建筑学院，江西南昌 330013
^4.中国石油大庆油田有限责任公司，黑龙江大庆 163453
^5.清华大学先进堆工程与安全教育部重点实验室，北京 100084

通讯作者: 张文超,蔡本安
作者简介:蔡伟华（1982—），男，博士，教授，caiwh@neepu.edu.cn
基金资助:
国家自然科学基金青年基金项目(52206194);先进堆工程与安全教育部重点实验室项目(ARES-2023-09);吉林省教育厅科学研究计划项目(JJKH20240158KJ)

Abstract

Abstract:

Combining the porous media foaming technology with the Venturi bubble generator, a porous media-Venturi bubble generator is developed. Using deionized water and air as the working material, the experimental study on visualization of gas production characteristics is carried out. Photographs to observe the bubble behavior in the region, analyze the porous media-Venturi bubble generator gas production law, discuss the influence of water flow and air flow law. The experimental results show that, compared with the traditional Venturi bubble generator, under the same inlet Reynolds number, the Sauter mean diameter of bubble produced by the porous media-Venturi bubble generator was reduced by 25.3%—47.4%, and the standard deviation was reduced in the range of 24.4%—62.2%, which indicates that the Sauter mean diameter of bubble produced by the improved bubble generator is smaller, and the particle size of bubbles is more uniform. The water flow rate increased from 5.01 m³/h to 14.98 m³/h, the Sauter mean diameter of bubble produced by the porous media-Venturi bubble generator decreased from 0.89 mm to 0.29 mm, and the standard deviation decreased from 0.32 mm to 0.085 mm; the gas flow rate increased from 0.30 L/min to 1.79 L/min, the Sauter mean diameter of bubble produced by the porous media-Venturi bubble generator increased from 0.33 mm to 0.48 mm, indicating that the Sauter mean diameter of bubbles produced by the bubble generator became smaller and the particle size distribution of bubbles was more uniform when the water flow rate was increased or the gas flow rate was decreased. The results provide an idea for the optimization of the Venturi bubble generator.

Key words: porous media, Venturi, bubble, gas-liquid flow

摘要：

将多孔介质发泡技术与文丘里气泡发生器相结合开发多孔介质-文丘里气泡发生器，以去离子水和空气为工质进行产气特性可视化实验研究，拍摄观察区域内气泡行为，分析多孔介质-文丘里气泡发生器产气规律，讨论水流量和气流量的影响规律。实验结果表明，与传统文丘里气泡发生器相比，在相同入口Reynolds数下，多孔介质-文丘里气泡发生器产生的气泡Sauter平均直径缩小25.3%~47.4%，标准差缩小24.4%~62.2%，说明改进的气泡发生器气泡Sauter平均直径更小，气泡粒径更均匀。水流量由5.01 m³/h增大到14.98 m³/h，多孔介质-文丘里气泡发生器产生的气泡Sauter平均直径由0.89 mm减小至0.29 mm，标准差由0.32 mm减小至0.085 mm；气流量由0.30 L/min增大到1.79 L/min，多孔介质-文丘里气泡发生器产生的气泡Sauter平均直径由0.33 mm增大到0.48 mm。说明水流量增大或气流量减小时，气泡发生器产生的气泡平均直径变小，气泡粒径分布更均匀。相关研究成果可为文丘里气泡发生器的优化提供新思路。

关键词: 多孔介质, 文丘里管, 气泡, 气液两相流

CLC Number:

O 35

Weihua CAI, Yuhang WANG, Wenchao ZHANG, Shaodan LI, Xinlong LIU, Ben'an CAI, Jincheng WANG. Gas production characteristics of a porous media-Venturi bubble generator[J]. CIESC Journal, 2024, 75(10): 3488-3497.

蔡伟华, 王玉航, 张文超, 李少丹, 刘鑫龙, 蔡本安, 王金成. 多孔介质-文丘里气泡发生器产气特性[J]. 化工学报, 2024, 75(10): 3488-3497.

Figures/Tables 18

Fig.1 Schematic diagram of porous media-Venturi bubble generator

Fig.2 Dimensional drawing of intake pipe section

Fig.3 Structural diagram of traditional Venturi bubble generator

Fig.4 Experimental system

Table 1 Instrumentation and data acquisition accuracy

测量仪表	量程	精度	数据采集精度
涡轮流量计	2~20 m³/h	1%	0.10%
气体流量计	0~2 L/min	1.5%	0.10%
压力表1	0~0.6 MPa	0.25%	0.10%
压力表2	-0.1~0.6 MPa	0.25%	0.10%
压力表3	0~0.6 MPa	0.25%	0.10%

Fig.5 Schematic diagram of selecting bubble samples

Fig.6 Bubble processing flowchart

Table 2 Experimental conditions of porous media-Venturi bubble generator

工况	气流量/(L/min)	水流量/(m³/h)	含气率/%
1	1.00	5.01	1.20
2	1.00	7.51	0.80
3	1.00	10.00	0.60
4	1.00	12.47	0.48
5	1.00	14.98	0.40
6	0.30	10.11	0.18
7	0.60	10.03	0.36
8	0.90	10.01	0.54
9	1.20	10.00	0.72
10	1.49	10.01	0.89
11	1.79	10.02	1.07

Fig.7 Bubble behavior in diffusion section

Fig.8 Comparison of observation sections for two types of bubble generators (water flow rate of 7.51 m3/h, gas flow rate of 1 L/min)

Fig.9 Variation of bubble number density with water flow rate for two types of bubble generators

Fig.10 Distribution of bubble diameter in two types of Venturi bubble generators under different water flow rates

Fig.11 Distribution of average bubble diameter and standard deviation under different water flow rates

Fig.12 Pressure drop variation in rear section of porous media-Venturi bubble generator under different water flow rates

Fig.13 Distribution of bubble diameters of two types of Venturi bubble generators at different air flow rates

Fig.14 Distribution of mean bubble diameter and its standard deviation at different air flow rates for a water flow rate of 10.00 m3/h

Fig.15 Variation of pressure drop in rear section of porous media-Venturi bubble generator for different gas flow rates

Fig.16 Comparison of predicted and experimental values

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Gas production characteristics of a porous media-Venturi bubble generator

多孔介质-文丘里气泡发生器产气特性

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