Misting of non-Newtonian liquids in forward roll coating |
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| Authors: | Michael S Owens Madhu Vinjamur LE Scriven CW Macosko |
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| Institution: | 1. Department of Mathematics and Applied Mathematics, University of Limpopo, Turfloop Campus, South Africa;2. Faculty of Military Science, Stellenbosch University, Saldanha, South Africa;1. Key Laboratory on Enhanced Oil and Gas Recovery of the Ministry of Education, Northeast Petroleum University, Daqing 163318, China;2. Daqing Oilfield of China National Petroleum Corporation, Daqing 163000, China;3. School of Computer and Information Technology, Northeast Petroleum University, Daqing 163318, China;4. Second Oil Production Plant of Daqing Oilfield of CNPC, Daqing 163511, China |
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| Abstract: | Misting of liquids in forward roll coating is a problem under certain conditions. The relaxation time is known to influence misting but the fundamental mechanisms are not clear. A new mechanism for misting of dilute non-Newtonian liquids was proposed based on visualizations with a high-speed camera. With these liquids, filaments were created which sometimes transformed into beads-on-string structures and the beads were ejected as mist droplets when the structures broke. Misting was quantified by measuring sizes of the generated droplets, their count and mass concentration. The measurements were related to elasticity of the solutions through their relaxation times. Small levels of elasticity reduce the amount of misting, but higher levels lead to an increase. |
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