Simulation of phase separation with large component ratio for oil-in-water emulsion in ultrasound field |
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| Institution: | 1. Chemistry Department, Kasr Alainy Hospitals, Cairo University, Cairo, Egypt;2. Department of Biochemistry, Translational and Clinical Research Unit, Faculty of Pharmacy, Misr International University, Cairo, Egypt;3. Department of Clinical Pharmacy and Pharmacy Practice, Faculty of Pharmacy, Translational and Clinical Research Unit, Misr International University, Cairo, Egypt;1. Engineering Research Centre for Waster Oil Recovery Technology and Equipment of Ministry of Education, Chongqing Technology and Business University, Chongqing 400067, China;2. School of Mechanical Engineering, Chongqing University of Technology, Chongqing 400054, China;1. FACE – The Multiphase Flow Assurance and Innovation Center, P.O. Box 40, N-2027 Kjeller, Norway;2. Norwegian Institute for Air Research (NILU), P.O. Box 100, N-2027 Kjeller, Norway;3. Technische Universität München, Arcisstraße 21, 80333 München, Germany;4. Department of Physics, University of Oslo, P.O. Box 1048, Blindern, N-0316 Oslo, Norway;5. Institute for Energy Technology (IFE), P.O. Box 40, N-2027 Kjeller, Norway;6. Department of Chemical Engineering, NTNU, N-7491 Trondheim, Norway |
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| Abstract: | This paper presents an exploration for separation of oil-in-water and coalescence of oil droplets in ultrasound field via lattice Boltzmann method. Simulations were conducted by the ultrasound traveling and standing waves to enhance oil separation and trap oil droplets. The focus was to the effect of ultrasound irradiation on oil-in-water emulsion properties in the standing wave field, such as oil drop radius, morphology and growth kinetics of phase separation. Ultrasound fields were applied to irradiate the oil-in-water emulsion for getting flocculation of the oil droplets in 420 kHz case, and larger dispersed oil droplets and continuous phases in 2 MHz and 10 MHz cases, respectively. The separated phases started to rise along the direction of sound propagation after several periods. The rising rate of the flocks was significantly greater in ultrasound case than that of oil droplets in the original emulsion, indicating that ultrasound irradiation caused a rapid increase of oil droplet quantity in the progress of the separation. The separation degree was also significantly improved with increasing frequency or irradiation time. The dataset was rearranged for growth kinetics of ultrasonic phase separation in a plot by spherically averaged structure factor and the ratio of oil and emulsion phases. The analyses recovered the two different temporal regimes: the spinodal decomposition and domain growth stages, which further quantified the morphology results. These numerical results provide guidance for setting the optimum condition for the separation of oil-in-water emulsion in the ultrasound field. |
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| Keywords: | Ultrasound separation Lattice Boltzmann method Oil-in-water emulsion |
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