Influence of poly(vinyl alcohol) molecular weight on drop coalescence and breakage rate

Agata Maria Bąk , Wioletta Podgórska

Abstract

The influence of poly(vinyl alcohol), PVA, molecular weight on drop breakage and coalescence in stirred liquid-liquid dispersion was considered. Three types of PVA of the same degree of hydrolysis 88% and different molecular weight in the range 13,000-186,000 were used in experiments. 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 c  0.002 wt%. Drop size distributions were predicted using multifractal breakage and coalescence models. Lost of stabilizing properties of PVA of highest molecular weight at high impeller speed was observed which can be explained by unfavourable molecule conformation in such conditions.
Author Agata Maria Bąk ZIDRCh
Agata Maria Bąk,,
- Department of Chemical Reactor Engineering and Dynamics
, Wioletta Podgórska ZIDRCh
Wioletta Podgórska,,
- Department of Chemical Reactor Engineering and Dynamics
Journal seriesChemical Engineering Research & Design, ISSN 0263-8762
Issue year2016
Vol108
NoSI
Pages88-100
Publication size in sheets0.6
Conference15th European Conference on Mixing, 28-06-2015 - 03-07-2015, Saint-Petersburg, Rosja
Keywords in Polishpoli(alkohol winylowy), rozkład wielkości kropel, napięcie międzyfazowe, równanie bilansu populacji, model multifraktalny rozpadu, model multifraktalny koalescencji
Keywords in Englishpoly(vinyl alcohol), drop size distribution, interfacial tension, population balance equation, multifractal breakage model, multifractal coalescence model
DOIDOI:10.1016/j.cherd.2015.10.027
URL http://www.sciencedirect.com/science/article/pii/S0263876215004013
Languageen angielski
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Bąk A.M., Podgórska W. - Influence of poly(vinyl alcohol)....pdf 2.09 MB
Score (nominal)30
ScoreMinisterial score [Punktacja MNiSW] = 30.0, 28-11-2017, ArticleFromJournalAndMatConfByIndicator
Ministerial score (2013-2016) [Punktacja MNiSW (2013-2016)] = 30.0, 28-11-2017, ArticleFromJournalAndMatConfByIndicator
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2016 = 2.538 (2) - 2016=2.82 (5)
Citation count*0
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UwagiVolume 108 Special Issue edited by Bałdyga Jerzy Robert, Kresta Suzanne, Line Alain, Abiev Rufat
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