Stirred tank membrane emulsification using flat metallic membranes: A dimensional analysis |
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| Affiliation: | 1. Laboratoire de Thermodynamique et Modélisation Moléculaire, Faculté de Chimie, USTHB, BP, 32 El-Alia, 16111 Bab Ezzouar, Algeria;2. Laboratoire de Chimie Analytique I, Université Claude Bernard (Lyon I), 43 Boulevard du 11 novembre 1918, Bât Raulin/2, 69622 Villeurbanne Cedex, France;1. Department of Mechanical Engineering, School of Engineering, Tokyo Institute of Technology, Yokohama, Japan;2. Institute of Innovative Research, Tokyo Institute of Technology, Yokohama, Japan;1. Engineering Research Center of Large Scale Reactor Engineering and Technology of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;2. Sinopec Qilu Company, Zibo 255400, China;3. Sinopec Luoyang Company, Luoyang 471003, China;4. Key laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China;1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China;2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;3. State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing 100084, China;1. College of Environmental Science and Engineering, Hunan University, Changsha, 410082, PR China;2. Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China;3. Shanghai Thepei Environmental Protection Technology Co. LTD, Shanghai, 201315, PR China |
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| Abstract: | The performance of a membrane emulsification unit, using flat membranes in a stirred tank, has been examined by dimensional analysis. The dimensionless numbers were defined in terms of shear and membrane pore size. Dimensionless droplet size prediction models based on simple force balances were used to select the most representative dimensionless numbers including operating parameters. Oil-in-water emulsions were produced with tailor-made metallic membranes with pore sizes of 30 and 50 μm. Results showed that monodisperse emulsions were produced with span values around 0.5, significantly lower than when a rotor-stator homogenizer is used. The influence of the selected operating parameters (impeller rotational speed, continuous phase viscosity and dispersed phase flux) on droplet size distribution was studied and experimental results were compared with droplet size prediction models. Impeller rotational speed and membrane pore size were the key parameters influencing emulsion droplet size and monodispersity. A correlation based on the Euler dimensionless number, including all the operating parameters is proposed. |
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