Oil droplet movement and micro-flow characteristics during interaction process between gas bubble and oil droplet in flotation

doi:10.1016/j.cjche.2021.03.014

Chinese Journal of Chemical Engineering ›› 2022, Vol. 45 ›› Issue (5): 229-237.DOI: 10.1016/j.cjche.2021.03.014

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Oil droplet movement and micro-flow characteristics during interaction process between gas bubble and oil droplet in flotation

Shenglin Yan¹, Yan Zhang¹, Chong Peng², Xiaoyong Yang¹, Yuan Huang³, Zhishan Bai¹, Xiao Xu¹

1 State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 Sinopec Dalian Research Institute of Petroleum and Petrochemicals, Dalian 116041, China;
3 Institute of Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China

Received:2021-01-11 Revised:2021-03-21 Online:2022-06-22 Published:2022-05-28
Contact: Zhishan Bai,E-mail:baizs@ecust.edu.cn
Supported by:
This research was supported by the National Natural Science Foundation of China (51578239) and the Education and Scientific Research Projects of Shanghai (17DZ1202802), for which the authors express their appreciation.

Oil droplet movement and micro-flow characteristics during interaction process between gas bubble and oil droplet in flotation

Shenglin Yan¹, Yan Zhang¹, Chong Peng², Xiaoyong Yang¹, Yuan Huang³, Zhishan Bai¹, Xiao Xu¹

1 State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China;
2 Sinopec Dalian Research Institute of Petroleum and Petrochemicals, Dalian 116041, China;
3 Institute of Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China

通讯作者: Zhishan Bai,E-mail:baizs@ecust.edu.cn
基金资助:
This research was supported by the National Natural Science Foundation of China (51578239) and the Education and Scientific Research Projects of Shanghai (17DZ1202802), for which the authors express their appreciation.

Abstract

Abstract: Flotation is an efficient pre-treatment technology for oily water. In this work, the interaction process between the moving oil droplet and the gas bubble was studied by high-speed camera and Bassset-Boussinesq-Oseen (BBO) theoretical model, and the experimental and simulation results of the oil droplet trajectory were compared. Moreover, the micro-particle image velocimetry system was utilized to observe the flow inside and outside of the moving oil droplet. The results show that the BBO model with the mobile bubble’s surface can reflect the velocity change trend of the oil droplet during the interaction process between the moving oil droplet and the gas bubble, but there are some significant differences between the experimental and simulation results. While the oil droplet is moving on the bubble’s surface, the velocity of the area near the contact point of oil droplet–gas bubble is less than that of the other areas inside the oil droplet. Meanwhile, the flow of water above the oil drop is more biased towards the gas bubble.

Key words: Flotation, Oil droplet–gas bubble interaction, Approach process, Hydrodynamics

摘要： Flotation is an efficient pre-treatment technology for oily water. In this work, the interaction process between the moving oil droplet and the gas bubble was studied by high-speed camera and Bassset-Boussinesq-Oseen (BBO) theoretical model, and the experimental and simulation results of the oil droplet trajectory were compared. Moreover, the micro-particle image velocimetry system was utilized to observe the flow inside and outside of the moving oil droplet. The results show that the BBO model with the mobile bubble’s surface can reflect the velocity change trend of the oil droplet during the interaction process between the moving oil droplet and the gas bubble, but there are some significant differences between the experimental and simulation results. While the oil droplet is moving on the bubble’s surface, the velocity of the area near the contact point of oil droplet–gas bubble is less than that of the other areas inside the oil droplet. Meanwhile, the flow of water above the oil drop is more biased towards the gas bubble.

关键词: Flotation, Oil droplet–gas bubble interaction, Approach process, Hydrodynamics

Shenglin Yan, Yan Zhang, Chong Peng, Xiaoyong Yang, Yuan Huang, Zhishan Bai, Xiao Xu. Oil droplet movement and micro-flow characteristics during interaction process between gas bubble and oil droplet in flotation[J]. Chinese Journal of Chemical Engineering, 2022, 45(5): 229-237.

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Oil droplet movement and micro-flow characteristics during interaction process between gas bubble and oil droplet in flotation

Oil droplet movement and micro-flow characteristics during interaction process between gas bubble and oil droplet in flotation

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