Micro-fabricated electrolytic micro-bubblers |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2935, USA;2. Department of Aerospace Engineering, University of Illinois at Urbana-Champaign, 306 Talbot Laboratory, 104 S. Wright Street, Urbana, IL 61801-2935, USA;1. School of Energy Resources, China University of Geosciences (Beijing), Haidian District, Beijing, 100083, China;2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, Beijing, 100083, China;3. Key Laboratory of Geological Evaluation and Development Engineering of Unconventional Natural Gas Energy, Beijing 100083, China;4. Research Institute of Petroleum Exploration and Development of Shengli Oilfield, Sinopec Corp, Dongying, 257015, China;5. Department of Petroleum Engineering, Faculty of Mineral Resources Technology, University of Mines and Technology, Tarkwa, Ghana;1. Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW 2522, Australia;2. ARC Centre of Excellence for Electromaterials Science, University of Wollongong, Wollongong, NSW 2522, Australia |
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| Abstract: | Rectangular node electrodes were developed with micro-fabrication techniques in order to produce an electrolytic micro-bubbler which, while subjected to a convective flow, can generate bubbles of nearly uniform size with mean diameters of 50 μm or less. The devices were fabricated and placed in both a quiescent tap water chamber and a water channel operating at laminar flow rates. The effect of applied voltage and flow conditions on the bubbles generated was tested on single electrode pairs. Videos of the bubbles generated by the devices were taken from which the bubble sizes and generation rates were recorded.It was found that higher applied voltages coincided with smaller average bubble size, a narrower distribution of bubble sizes, higher bubble fluxes, and a higher current efficiency. The imposition of a hydrodynamic flow was shown to reduce average bubble size, narrow the range of bubble sizes, and reduce current efficiency. Smaller electrode nodes were seen to reduce the number of active nucleation sites and thus produced a narrower bubble size distribution. In the best case, the bubble distribution was nearly mono-disperse with a small average bubble diameter (ca. 40 μm) with repeatable mean bubble diameters and bubble fluxes. Intermediate values of the ratio of electrode node width and cathode/anode spacing provided the largest average bubble diameters. |
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