Influence of poly(vinyl alcohol) molecular weight on drop coalescence and breakage rate
Agata Maria Bąk , Wioletta Podgórska
AbstractThe influence of poly(vinyl alcohol), PVA, molecular weight and polymer concentration on drop breakage and coalescence in two phase liquid-liquid dispersion was considered. Three types of PVA of the same degree of hydrolysis equal to 88% and different molecular weight in the range 13000-186000 were used in experiments. Additionally, dynamic interfacial tensions were measured with the drop volume method. Molecular weight affects steric forces, interfacial tension and surface viscosity, which all have an influence on drop size distribution. PVA of lower molecular weight reduces the interfacial tension more effectively while the adsorption of high molecular weight PVA is slower and more complicated. Drop interfaces can remain partially mobile for polymer concentration as small as 0.001 wt.% or they can be significantly immobilized for PVA concentration in the range 0.002–0.01 wt.%. Intermittent character of turbulence was described by multifractal formalism and drop size distributions were predicted by solving the population balance equation.
|Publication size in sheets||0.5|
|Book||Abiev Rufat (eds.): Proceedings of 15th European Conference on Mixing, Mixing 15, 28.06 - 03.07.2015, St. Petersburg, Russia, 2015, Saint Petersburg State Institute of Technology (Technical University), ISBN 978-5-905240-52-2, 404 p.|
|Keywords in Polish||poli(alkohol winylowy), rozkład wielkości kropel, napięcie międzyfazowe, bilans populacji, model multifraktalny na rozpad i koalescencję kropel|
|Keywords in English||poly(vinyl alcohol), drop size distribution, interfacial tension, population balance, multifractal breakage and coalescence model|
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