1
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Hansen HHWB, Ouyang L, Cha H, Zhang J, Li Q, Tan BH, Vashi A, Nguyen NT, An H. Surface Cleaning of Oil Contaminants Using Bulk Nanobubbles. CHEMSUSCHEM 2024:e202400802. [PMID: 38966899 DOI: 10.1002/cssc.202400802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/19/2024] [Indexed: 07/06/2024]
Abstract
The removal of oil from solid surfaces, such as textiles and plates, remains a challenge due to the strong binding affinity of the oil. Conventional methods for surface cleaning often require surfactants and mechanical abrasion to enhance the cleaning process. However, in excess, these can pose adverse effects on the environment and to the material. This study investigated how bulk nanobubble water can clean oil microdroplets deposited on surfaces like glass coverslips and dishes. Microscopy imaging and further image analysis clearly revealed that these microdroplets detached from both hydrophobic and hydrophilic surfaces when washed with bulk nanobubble water within a fluidic microchannel. Oil contaminant cleaning was also conducted in water as mobile phase to mimic the circumstances that occur in a dishwasher and washing machine. Cleaning on a larger scale also proved very successful in the removal of oil from a porcelain bowl. These results indicate that nanobubble water can easily remove oil contaminants from glass and porcelain surfaces without the assistance of surfactants. This is in stark contrast to negligible results obtained with a control solution without nanobubbles. This study indicates that nanobubble technology is an innovative, low-cost, eco-friendly approach for oil removal, demonstrating its potential for broad practical applications.
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Affiliation(s)
- Helena H W B Hansen
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Lingxi Ouyang
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Haotian Cha
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Jun Zhang
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Engineering and Built Environment, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Qin Li
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Engineering and Built Environment, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Beng Hau Tan
- Shenzhen Institute of Advanced Study, University of Electronic Science and Technology of China, Shenzhen, 518110, China
| | - Aditya Vashi
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Nam-Trung Nguyen
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Hongjie An
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
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2
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Wang C, Lü Y, Qi H, Luo X, He L. Flotation mechanism and performance of air/condensate bubbles for removing oil droplets in the presence of acetic acid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 927:172311. [PMID: 38599416 DOI: 10.1016/j.scitotenv.2024.172311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/20/2024] [Accepted: 04/06/2024] [Indexed: 04/12/2024]
Abstract
Flotation technology is widely utilized to remove emulsified oil droplets from Produced water. Organic acid adsorption on the oil droplet surface affects bubble attachment, reducing oil removal efficiency. This investigation exploited the principle of similar dissolution to synthesize condensate bubbles (CB). The surface properties of oil droplets and CB and air bubbles (AB) were appraised using FTIR, zeta potential, interfacial tension, and contact angle measurements. The research also investigated the effects of acetic acids (AA) on the adhesion of oil droplets to AB and CB along with the underlying mechanism via the Extended Derjaguin-Landau-Verwey-Overbeek (EDLVO) interaction theory and the Stefan-Reynolds model of liquid film thinning, integrated with adhesion times. Flotation efficiency and kinetic dissimilarities between AB and CB were also examined. The results indicated that CB exhibits superior lipophilic hydrophobicity compared to AB, reduced induction and spreading times upon oil droplet attachment, and maximized oil removal efficiency. Furthermore, CB could mitigate the impact of AA on adhesion. The interaction barriers between CB and oil droplets were minimal, and the thinning rate of the hydration film was quicker than in AB. The conventional first-order model proved effective in fitting the AB flotation, whereas a delay constant was applied to the model of the CB flotation rate.
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Affiliation(s)
- Ce Wang
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China
| | - Yuling Lü
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China; Surface Engineering Pilot Test Center, CNPC, Heilongjiang, Daqing 163000, China.
| | - Hongwei Qi
- China Petroleum & Chemical Co., Ltd. of North Branch, Ordos, Inner Mongolia 017400, China
| | - Xiaoming Luo
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China; Surface Engineering Pilot Test Center, CNPC, Heilongjiang, Daqing 163000, China
| | - Limin He
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Qingdao, Shandong Province 266580, China; Surface Engineering Pilot Test Center, CNPC, Heilongjiang, Daqing 163000, China
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3
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Chen Z, Wang X, Zhang J, Zhang W, Duan M, Xiong Y, Fang S. Study on the structure-activity relationship of cationic polyacrylates for the treatment of oilfield produced water. RSC Adv 2024; 14:8124-8134. [PMID: 38464688 PMCID: PMC10921276 DOI: 10.1039/d4ra00188e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Accepted: 03/05/2024] [Indexed: 03/12/2024] Open
Abstract
Cationic polyacrylates exhibit both reverse demulsification and flotation performance, which can avoid incompatibility between the reverse demulsifier and flotation agent during treatment of produced water from offshore oilfields. In our previous work, the effect of the structure of the cationic unit on the reverse demulsification and flotation performance of cationic polyacrylates was studied. However, the structure-activity relationship of cationic polyacrylates has not been systematically studied. In this study, the relationships between the structure (acrylate type, tertiary amine type, mass ratio of acrylate to tertiary amine, and degree of cationicity), interfacial properties (surface tension, interfacial tension, zeta potential, interfacial elastic modulus, interaction force between oil droplets, and film drainage time of an oil-covered bubble), and reverse demulsification and flotation performance of cationic polyacrylates were investigated. A reduction in the elastic modulus of the oil-water interface was the key factor for good reverse demulsification performance, whereas a decrease in the film drainage time of an oil-covered bubble was the key factor for good flotation performance. Ethyl acrylate (EA) was superior to methyl acrylate (MA), and dimethylaminopropyl methacrylamide (DPM) was superior to dimethylaminoethyl methacrylate (DEM). Increases in the mass ratio of ethyl acrylate to dimethylaminopropyl methacrylamide and the degree of cationicity were beneficial for reducing the elastic modulus of the oil-water interface and the film drainage time of an oil-covered bubble. This is the first time that the structure-property-performance relationship of cationic polyacrylates has been systematically studied. A cationic polyacrylate that exhibited both good reverse demulsification performance and good flotation performance is recommended.
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Affiliation(s)
- Zhiping Chen
- School of Chemistry and Chemical Engineering, Southwest Petroleum University 8 Xindu Avenue, Xindu District Chengdu Sichuan 610500 China +86-2883037346 +86-2883037346
| | - Xiujun Wang
- State Key Laboratory of Offshore Oil Exploitation Beijing China
- CNOOC Research Institute Company, Ltd. Beijing China
| | - Jian Zhang
- State Key Laboratory of Offshore Oil Exploitation Beijing China
- CNOOC Research Institute Company, Ltd. Beijing China
| | - Wenju Zhang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University 8 Xindu Avenue, Xindu District Chengdu Sichuan 610500 China +86-2883037346 +86-2883037346
| | - Ming Duan
- School of Chemistry and Chemical Engineering, Southwest Petroleum University 8 Xindu Avenue, Xindu District Chengdu Sichuan 610500 China +86-2883037346 +86-2883037346
| | - Yan Xiong
- School of Chemistry and Chemical Engineering, Southwest Petroleum University 8 Xindu Avenue, Xindu District Chengdu Sichuan 610500 China +86-2883037346 +86-2883037346
| | - Shenwen Fang
- School of Chemistry and Chemical Engineering, Southwest Petroleum University 8 Xindu Avenue, Xindu District Chengdu Sichuan 610500 China +86-2883037346 +86-2883037346
- Industrial Hazardous Waste Disposal and Resource Utilization Research Institute, Southwest Petroleum University Chengdu Sichuan China
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4
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Ho WS, Lin WH, Verpoort F, Hong KL, Ou JH, Kao CM. Application of novel nanobubble-contained electrolyzed catalytic water to cleanup petroleum-hydrocarbon contaminated soils and groundwater: A pilot-scale and performance evaluation study. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 347:119058. [PMID: 37757689 DOI: 10.1016/j.jenvman.2023.119058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 09/10/2023] [Accepted: 09/18/2023] [Indexed: 09/29/2023]
Abstract
Soil and groundwater contamination caused by petroleum hydrocarbons is a severe environmental problem. In this study, a novel electrolyzed catalytic system (ECS) was developed to produce nanobubble-contained electrolyzed catalytic (NEC) water for the remediation of petroleum-hydrocarbon-contaminated soils and groundwater. The developed ECS applied high voltage (220 V) with direct current, and titanium electrodes coated with iridium dioxide were used in the system. The developed ECS prototype contained 21 electrode pairs (with a current density of 20 mA/cm2), which were connected in series to significantly enhance the hydroxyl radical production rate. Iron-copper hybrid oxide catalysts were laid between each electrode pair to improve the radical generation efficiency. The electron paramagnetic resonance (EPR) and Rhodamine B (RhB) methods were applied for the generated radical species and concentration determination. During the operation of the ECS, high concentrations of nanobubbles (nanobubble density = 3.7 × 109 particles/mL) were produced due to the occurrence of the cavitation mechanism. Because of the negative zeta potential and nano-scale characteristics of nanobubbles (mean diameter = 28 nm), the repelling force would prevent the occurrence of bubble aggregations and extend their lifetime in NEC water. The radicals produced after the bursting of the nanobubbles would be beneficial for the increase of the radical concentration and subsequent petroleum hydrocarbon oxidation. The highly oxidized NEC water (oxidation-reduction potential = 887 mV) could be produced with a radical concentration of 9.5 × 10-9 M. In the pilot-scale study, the prototype system was applied to clean up petroleum-hydrocarbon polluted soils at a diesel-oil spill site via an on-site slurry-phase soil washing process. The total petroleum hydrocarbon (TPH)-contaminated soils were excavated and treated with the NEC water in a slurry-phase reactor. Results show that up to 74.4% of TPH (initial concentration = 2846 mg/kg) could be removed from soils after four rounds of NEC water treatment (soil and NEC water ratio for each batch = 10 kg: 40 L and reaction time = 10 min). Within the petroleum-hydrocarbon plume, one remediation well (RW) and two monitor wells (located 1 m and 3 m downgradient of the RW) were installed along the groundwater flow direction. The produced NEC water was injected into the RW and the TPH concentrations in groundwater (initial concentrations = 12.3-15.2 mg/L) were assessed in these three wells. Compared to the control well, TPH concentrations in RW and MW1 dropped to below 0.4 and 2.1 mg/L after 6 m3 of NEC water injection in RW, respectively. Results from the pilot-scale study indicate that the NEC water could effectively remediate TPH-contaminated soils and groundwater without secondary pollution production. The main treatment mechanisms included (1) in situ chemical oxidation via produced radicals, (2) desorption of petroleum hydrocarbons from soil particles due to the dispersion of nanobubbles into soil pores, and (3) enhanced TPH oxidation due to produced radicals and energy after nanobubble bursting.
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Affiliation(s)
- Wing-Sze Ho
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan
| | - Wei-Han Lin
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan
| | - Francis Verpoort
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, PR China
| | - Kun-Liang Hong
- Suzhou Dingdedian Environmental Protection Technology Co. Ltd., Suzhou, PR China
| | - Jiun-Hau Ou
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan.
| | - Chih-Ming Kao
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan.
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5
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Zhang Y, Yan S, Bai Z. Effect of salt addition on the coalescence process of droplets on fiber. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2023.118628] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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6
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Zhou K, Maugard V, Zhang W, Zhou J, Zhang X. Effects of Gas Type, Oil, Salts and Detergent on Formation and Stability of Air and Carbon Dioxide Bubbles Produced by Using a Nanobubble Generator. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13091496. [PMID: 37177046 PMCID: PMC10180106 DOI: 10.3390/nano13091496] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/19/2023] [Accepted: 04/22/2023] [Indexed: 05/15/2023]
Abstract
Recent developments in ultrafine bubble generation have opened up new possibilities for applications in various fields. Herein, we investigated how substances in water affect the size distribution and stability of microbubbles generated by a common nanobubble generator. By combining light scattering techniques with optical microscopy and high-speed imaging, we were able to track the evolution of microbubbles over time during and after bubble generation. Our results showed that air injection generated a higher number of microbubbles (<10 μm) than CO2 injection. Increasing detergent concentration led to a rapid increase in the number of microbubbles generated by both air and CO2 injection and the intensity signal detected by dynamic light scattering (DLS) slightly increased. This suggested that surface-active molecules may inhibit the growth and coalescence of bubbles. In contrast, we found that salts (NaCl and Na2CO3) in water did not significantly affect the number or size distribution of bubbles. Interestingly, the presence of oil in water increased the intensity signal and we observed that the bubbles were coated with an oil layer. This may contribute to the stability of bubbles. Overall, our study sheds light on the effects of common impurities on bubble generation and provides insights for analyzing dispersed bubbles in bulk.
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Affiliation(s)
- Kaiyu Zhou
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Vincent Maugard
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Wenming Zhang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
| | - Joe Zhou
- Disruptive Separation Technology Ltd. (DSTL), Edmonton, AB T6X 1M5, Canada
| | - Xuehua Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada
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7
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Separation characters of an axial-flow hydrocyclone with oil collecting pipe. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2022.122139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Wang C, Lü Y, Song C, Zhang D, Rong F, He L. Separation of emulsified crude oil from produced water by gas flotation: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 845:157304. [PMID: 35839883 DOI: 10.1016/j.scitotenv.2022.157304] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 07/01/2022] [Accepted: 07/08/2022] [Indexed: 06/15/2023]
Abstract
The development and production of oil and gas fields would eventually result in a considerable amount of oily generated water, posing serious risks to humans and the environment. Nowadays, the oil concentration in the drainage stream of the produced water is strictly regulated, and many countries have established strict emission standards. As an indispensable oily wastewater treatment technology, flotation technology has attracted much attention because of its maturity, economy, practicality, and relative efficiency. Firstly, this paper summarizes and compares flotation techniques, such as dissolved gas flotation, induced gas flotation, electroflotation, and compact flotation units widely used in produced water treatment offshore in recent years. Considering the complexity of the mechanism of oil removal by air flotation, the mechanism of the oil droplet-bubble interaction is further discussed. The effects of flocculant, PH, and salinity on the oil droplet-bubble interaction in the flotation process were summarized from the perspective of the microscopic colloidal interface, which has a specific guiding role in improving the oil removal efficiency in the gas flotation process. Finally, the research status of produced water treatment by air flotation is summarized, and the feasible research direction is put forward.
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Affiliation(s)
- Ce Wang
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Shandong, Qingdao 266580, China
| | - Yuling Lü
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Shandong, Qingdao 266580, China.
| | - Chao Song
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Shandong, Qingdao 266580, China
| | - Dechong Zhang
- Xianhe Oil Production Plant, Shengli Oilfield Company, Sinopec, Shandong, Dongying 257000, China
| | - Feng Rong
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Shandong, Qingdao 266580, China
| | - Limin He
- College of Pipeline and Civil Engineering, China University of Petroleum (East China), Shandong, Qingdao 266580, China
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Ghafoori S, Omar M, Koutahzadeh N, Zendehboudi S, Malhas RN, Mohamed M, Al-Zubaidi S, Redha K, Baraki F, Mehrvar M. New advancements, challenges, and future needs on treatment of oilfield produced water: A state-of-the-art review. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120652] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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10
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Yan S, Zhang Y, Peng C, Yang X, Huang Y, Bai Z, Xu X. Oil droplet movement and micro-flow characteristics during interaction process between gas bubble and oil droplet in flotation. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2021.03.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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Li X, Lan H, Zhang G, Tan X, Liu H. Systematic Design of a Flow-Through Titanium Electrode-Based Device with Strong Oil Droplet Rejection Property for Superior Oil-in-Water Emulsion Separation Performance. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:4151-4161. [PMID: 35266701 DOI: 10.1021/acs.est.1c07403] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Oily wastewater treatment has been restricted by the existence of stable oil-in-water (O/W) emulsions containing micrometer-sized oil droplets. However, the strong adhesion and stacking of emulsified oil droplets on the surface of current separation media cause serious fouling of the treatment unit and the rapid decline of treatment efficiency. Herein, a novel flow-through titanium (Ti) electrode-based filtration device with remarkable oil droplet rejection property was well designed for the continuously separating O/W emulsion. In contrast to the pristine Ti foam, the permeance of the TiO2 nanoarray-coated Ti foam (NATF) increased from 2538 to 4364 L m-2 h-1 bar-1 through gravity-driven flow. Further, more than ∼70% permeability can be maintained after 6 h of O/W emulsion filtration using the current device, the value of which was markedly higher than that of conventional oil/water separation filters (less than 5%). According to the results of wettability test, the super-oil-repellent surface endowed by this nanoarray structure primarily avoided the formation of a compact oil fouling layer. When the voltage was applied, accompanied by the electrophoresis effect, redistribution of surfactant molecules on the surface of oil droplets induced by an electric field made them readily captured by the microbubbles continuously generated from the electrode, thereby rapidly migrating these bubble-adhered oil droplets far from the filtration medium.
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Affiliation(s)
- Xi Li
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Huachun Lan
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Gong Zhang
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Xiao Tan
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Huijuan Liu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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12
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Zhang Y, Yan S, Yang X, Bai Z. Hydrodynamics and morphologies of droplets coalescence on fiber. AIChE J 2022. [DOI: 10.1002/aic.17673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yan Zhang
- 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 China
| | - Shenglin Yan
- 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 China
| | - Xiaoyong Yang
- 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 China
| | - Zhishan Bai
- 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 China
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Abstract
The dynamics of a three-phase gas–liquid–liquid multiphase system is examined by direct numerical simulations. The system consists of a continuous liquid phase, buoyant gas bubbles, and smaller heavy drops that fall relative to the continuous liquid. The computational domain is fully periodic, and a force equal to the weight of the mixture is added to keep it in place. The governing parameters are selected so that the terminal Reynolds numbers of the bubbles and the drops are moderate; while the effect of bubble deformability is examined by changing its surface tension, the surface tension for the drops is sufficiently high so they do not deform. One bubble in a “unit cell” and eight freely interacting bubbles are examined. The dependency of the slip velocities, the velocity fluctuations, and the distribution of the dispersed phases on the volume fraction of each phase are examined. It is found that while the distribution of drops around a single bubble in a “unit cell” is uneven and depends on its deformability, the distribution of drops around freely interacting bubbles is relatively uniform for the parameters examined in this study.
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14
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Binyaminov H, Abdullah F, Zargarzadeh L, Elliott JAW. Thermodynamic Investigation of Droplet-Droplet and Bubble-Droplet Equilibrium in an Immiscible Medium. J Phys Chem B 2021; 125:8636-8651. [PMID: 34310143 DOI: 10.1021/acs.jpcb.1c02877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In the absence of external fields, interfacial tensions between different phases dictate the equilibrium morphology of a multiphase system. Depending on the relative magnitudes of these interfacial tensions, a composite system made up of immiscible fluids in contact with one another can exhibit contrasting behavior: the formation of lenses in one case and complete encapsulation in another. Relatively simple concepts such as the spreading coefficient (SC) have been extensively used by many researchers to make predictions. However, these qualitative methods are limited to determining the nature of the equilibrium states and do not provide enough information to calculate the exact equilibrium geometries. Moreover, due to the assumptions made, their validity is questionable at smaller scales where pressure forces due to curvature of the interfaces become significant or in systems where a compressible gas phase is present. Here we investigate equilibrium configurations of two fluid drops suspended in another fluid, which can be seen as a simple building block of more complicated systems. We use Gibbsian composite-system thermodynamics to derive equilibrium conditions and the equation acting as the free energy (thermodynamic potential) for this system. These equations are then numerically solved for an example system consisting of a dodecane drop and an air bubble surrounded by water, and the relative stability of distinct equilibrium shapes is investigated based on free-energy comparisons. Quantitative effects of system parameters such as interfacial tensions, volumes, and the scale of the system on geometry and stability are further explored. Multiphase systems similar to the ones analyzed here have broad applications in microfluidics, atmospheric physics, soft photonics, froth flotation, oil recovery, and some biological phenomena.
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Affiliation(s)
- Hikmat Binyaminov
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
| | - Fahim Abdullah
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
| | - Leila Zargarzadeh
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
| | - Janet A W Elliott
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
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15
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Ami Ahmadi H, Ebadi A, Hosseinalipour SM. Experimental study of bubble-droplet interaction in water; the effect of water salinity on the drainage time. J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2021.1930037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Hesam Ami Ahmadi
- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
| | - Adel Ebadi
- School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
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16
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Yan S, Zhang Y, Yang X, Huang Y, Bai Z, Xu X. Interfacial Behavior and Internal Microflow of an Oil Droplet during the Process of the Oil Droplet Covering a Gas Bubble: Without and with NaCl. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shenglin Yan
- 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, PR China
| | - Yan Zhang
- 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, PR China
| | - Xiaoyong Yang
- 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, PR China
| | - Yuan Huang
- Institute of Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, PR China
| | - Zhishan Bai
- 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, PR China
| | - Xiao Xu
- 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, PR China
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